Skip to content
DIESEL

All versions since Diesel 2.0.0
All versions

Diesel 2.0.0

Diesel 2.0.0 contains the contributions of more than 130 people. More than 1700 commits were submitted over a span of 3 years.

As part of this release we introduced numerous new features and rewrote large parts of the internal structure. Check out our changelog for a complete list of changes. As this is a new major Diesel release it contains a number of breaking changes. Checkout our migration guide for details about how to handle those breaking changes.

This release contains the following parts:

  • diesel 2.0.0-rc.0
  • diesel_derives 2.0.0-rc.0
  • diesel_migrations 2.0.0-rc.0
  • diesel_cli 2.0.0-rc.0
  • diesel_dynamic_schema 0.2.0-rc.0

This release marks a first prerelease of the upcoming Diesel 2.0 release. We ask you for your help to finalise the release. Checkout the “Timeline for a Diesel 2.0 release” section for details about how you can help us finishing the release.

Features

As a highlight Diesel 2.0.0 adds support for the following features:

  • Fully type checked GROUP BY support
  • Support for table aliasing
  • Support for defining select clauses via a corresponding type
  • Support for UNION/INTERSECT queries

Support for GROUP BY clauses

Diesel 2.0 adds support for GROUP BY clauses for select queries.

This means queries like the following one will just work.

 users::table.inner_join(posts::table)
    .group_by(users::id)
    .select((users::name, count(posts::id)))

As this is the case for all other Diesel built-in query dsl, this construct is fully checked at compile time. This means Diesel will ensure that the GROUP BY clause is valid for the current query and it will also ensure that expressions appearing inside of your SELECT clause will match the aggregation rules provided by the current GROUP BY clause.

Support for table aliasing

Diesel 2.0 adds support for table aliasing. This enables users to write queries, where a table appears more than once in the corresponding FROM clause. For this Diesel provides a Diesel::alias! macro that allows to define new alias for existing tables.

The following query demonstrates the support for this feature:

// Define new table alias for the existing `users` table
let users1 = diesel::alias!(schema::users as user1);


// Use the corresponding alias inside any existing query
users::table
    .inner_join(users1.on(users::id).eq(users1.field(users::id))))
    .select((users::id, users::name, users1.field(users::name)))
    .order_by(users1.field(users::id))

Again all of this is checked at compile time. So similar to a normal table, columns from aliases are only allowed to appear if the corresponding query actually uses the alias.

Implied selection via the new Selectable trait

Diesel 2.0 features a new Selectable trait and derive that lets users declare that a type expects a certain kind of select clause. The major use case for this feature is to ensure that columns from a specific query are always requested in the right order for a corresponding type implementing Queryable. This also works for complex queries involving joins or other kinds of nesting.

#[derive(Queryable, Selectable)]
struct User {
    id: i32,
    name: String,
}


let first_user = users.select(User::as_select()).first(connection)?;

Diesel enforces at type system level that once you provided such a select clause via User::as_select() you are only allowed to construct this type from the returned result of the corresponding query. This means there is no need to specify the User type twice in the query above.

Support for UNION/INTERSECT/EXCEPT queries

Diesel 2.0 extents the query builder to support query combinations via UNION/INTERSECT/EXCEPT. This allows you to easily chain multiple queries together as long as they return fields of the same type. Queries like the following one are now supported:

 users.select(user_name.nullable())
    .union(animals.select(animal_name).filter(animal_name.is_not_null()))

As always this is checked at compile time to reject invalid queries, like for example that ones containing select clauses with different fields.

Call for Participation

The release of Diesel 2.0 does not only include the features listed above, but also marks the point where the following things can be provided by third party crates:

  • Custom QueryDsl extensions to support previously unsupported SQL features. Checkout diesel_full_text_search for an example
  • Alternative query dsl implementations reusing the existing Connection infrastructure
  • Custom Connection implementations for existing backends
  • Custom Connection and Backend implementations for previously unsupported backends. Checkout diesel-oci for an example.

We encourage our community to try out those features. Especially we would like to see experimentation around:

  • Previously unsupported database backends
  • Pure rust implementations of existing backend implementations. Checkout this and this discussion for starting points.
  • Alternative query dsl implementations. Checkout this discussion as starting point.

Please get in touch with us for pointers, help and details.

Input for Future Roadmap

With the release of Diesel 2.0 the planing for our next releases start. Hopefully they will not take as long as Diesel 2.0. We are looking for input on which features are wanted by our community. Please open a discussion thread with your idea in our discussion forum.

Weiznich will work on improving error messages for trait heavy crates based on a Rust Foundation Project Grant. This work will hopefully improve error messages for Diesel as well. If you are aware of bad error messages please submit a minimal example here.

Thanks

As part of this release we would like to welcome @Ten0 as part of the diesel core team.

Thank you to everyone who helped make this release happen through bug reports, and discussion on Gitter. While we don’t have a way to collect stats on that form of contribution, it’s greatly appreciated.

In addition to the Diesel core team, 141 people contributed code to this release. A huge thank you to:

  • Alessandro Menezes
  • Alexander ‘z33ky’ Hirsch
  • Alexei Pastuchov
  • Alice Ryhl
  • Amila Welihinda
  • Andre Braga Reis
  • Andreas Runfalk
  • Andrew Safigan
  • Andrew Speed
  • Andy Russell
  • Artem Vorotnikov
  • Arve Seljebu
  • Billy Chan
  • Blas Rodriguez Irizar
  • Bryan Henry
  • Callym
  • Caroline Glassberg-Powell
  • Cassie Jones
  • Chenxi Yuan
  • Chris Eckhardt
  • Chris Hanks
  • Chris Maddox
  • Chris West (Faux)
  • Clouds Flowing
  • Corentin Henry
  • Daniel Buse
  • Danilo Bargen
  • David Teller
  • David Tulig
  • DebugSteven
  • Diggory Blake
  • Dmitriy Pleshevskiy
  • Dusty Mabe
  • DrVilepis
  • EclipsedSolari
  • Emile Fugulin
  • Emm
  • Emmanuel Surleau
  • Erlend Langseth
  • Felix Watts
  • Filip Gospodinov
  • Garrett Thornburg
  • Giorgio Gambino
  • Grégory Obanos
  • Hal Gentz
  • Han Xu
  • Heliozoa
  • Henk van der Laan
  • Henry Boisdequin
  • Hirokazu Hata
  • Iban Eguia (Razican)
  • Igor Raits
  • Ivan Tham
  • JR Heard
  • Jean SIMARD
  • Jeremy Stucki
  • Jiří Sejkora
  • jigaoqiang
  • Joel Parker Henderson
  • John Brandt
  • Jonas Platte
  • Jonas Schievink
  • Joshua Koudys
  • Juhasz Sandor
  • Justice4Joffrey
  • Katharina Fey
  • Kevin King
  • Kevin Kirchner
  • Khionu Sybiern
  • Kitsu
  • Koisell
  • Kononnable
  • Leonardo Yvens
  • Lukas Markeffsky
  • Maccesch
  • Marc-Stefan Cassola
  • Martell Malone
  • Martijn Groeneveldt
  • Martin Nordholts
  • Matthew Kuo
  • Matthieu Guillemot
  • Mcat12
  • Meven
  • Mike Cronce
  • Mr Ceperka
  • Nafiul Islam
  • Nathan Papapietro
  • Nicholas Yang
  • Oliver Cooper
  • Otto Castle
  • Pankaj Jangid
  • Paolo Barbolini
  • Paul Le Corre
  • Paul Martensen
  • Pavan Kumar Sunkara
  • Paweł Przeniczny
  • Philip Trauner
  • Raphael Arias
  • Roman
  • Ryan Leckey
  • Sarthak Singh
  • Scott Driggers
  • Sean Klein
  • Simon Ertl
  • Spencer Taylor
  • Steven Chu
  • Storm Timmermans
  • Sébastien Santoro
  • Takayuki Maeda
  • Thomas Constantine Moore
  • Thomas Eizinger
  • Thomas Etter
  • Tom MacWright
  • Tuetuopay
  • Urhengulas
  • Vanio Begic
  • WebeWizard
  • William Myers
  • Yin Jifeng
  • Yuki Okushi
  • Zane Duffield
  • blackghost1987
  • czotomo
  • dchenk
  • ejc Drobnič
  • gorbit99
  • hasezoey
  • hi-rustin
  • kevinpoitra
  • kpcyrd
  • matthew-dowdell
  • ode79
  • ropottnik
  • telios
  • theredfish
  • zoewithabang
  • Zhenhui Xie
  • Émile Fugulin
  • κeen
  • 二手掉包工程师
  • 棒棒彬_Binboy

Diesel 2.0.1

This is a bugfix release containing the following fixes:

  • Fixed an issue with diesel_cli generating incompatible type names for the generate_missing_sql_type_definitions feature on PostgreSQL
  • Fixed an issue how diesel_cli handles sqlite urls while checking if a given database exists
  • Fixed an issue with PgConnection becoming unusable after hitting a database error in certain situations
  • Fixed an issue with diesel generating invalid SQL for certain INSERT … ON CONFLICT queries
  • Fixed diesel_derives generating code that triggers the disabled by default unused_qualifications lint

This release includes updated versions of diesel, diesel_cli and diesel_derives

Diesel 2.0.2

Fixed

  • Reverted a fix from the 2.0.1 release that breaks valid INSERT … ON CONFLICT queries

Diesel 2.0.3

Fixed

  • Fixed a bug with our transaction manager implementation that caused by marking transactions as broken which could be recovered.
  • Fixed an issue with the combination of BoxableExpression and order clauses

Diesel-derives 2.0.2

  • Fixing the fallout of a breaking change from quote by not using their internal API

Diesel 2.0.4

Fixed

  • Workaround the missing name resolution in rust-analyzer. This should fix type inference for some diesel queries. (It remains broken for queries containing .filter()/.inner_join()/.left_join(). These require fixes in rust-analyzer itself)
  • Fixed a bug that could lead to inserting null values instead of empty values for custom sqlite types
  • Fixed a bug that could lead to an unexpected panic while providing an out of bounds bind for sql_query in the sqlite backend
  • Fixed some mysql backend specific impl being behind the mysql instead of the mysql_backend feature flag

Added

  • Support for libsqlite3-sys 0.26

Diesel 2.1.0

Diesel 2.1.0 contains the contributions of 42 people. More than 380 commits were submitted over a span of 9 months.

This release contains several new features and improves existing features. It introduces support for generating migrations based on the diff between your schema.rs file and your database via Diesel CLI. Diesel derives now provides a #[derive(MultiConnection)] derive macro that allows to easily combine different database connections into a single enum, which implements Connection on its own. The MySQL backend gets support for upsert queries via the ON DUPLICATE KEYS syntax. Finally we provide new tooling to improve complex error messages generated for common error cases. Check out our changelog for a complete list of changes.

This release wouldn’t be possible without the support of our contributors and sponsors. If you want to support diesels development, consider joining the reviewer team, submitting PR’s, help writing documentation or sponsor the maintainers.

Migration generation

Diesel CLI now includes support for generating migrations based on the difference of your schema.rs file and your local database. This works as following:

  1. Start editing your schema.rs file, for example by adding your first table:
diesel::table! {
    users {
        id -> Integer,
        name -> Text,
    }
}
  1. Run diesel migration generate my_first_migration --diff-schema --database-url DATABASE_URL
  2. Checkout, verify and possible modify the generated migration:
-- Your SQL goes here
CREATE TABLE `users`(
  `id` INTEGER NOT NULL PRIMARY KEY,
  `name` TEXT NOT NULL
);
  1. Run the migration via diesel migration run --database-url DATABASE_URL

It’s important to note that the generated migrations can only contain information that are part of the schema.rs file. This explicitly excludes default value, custom check constraints and similar SQL features. We expect the generated migrations to be a good starting point for writing the actual migration you need, we do not expect them to include all necessary information in all cases or to provide the perfect solution in each scenario.

MultiConnection support

Diesel now includes a #[derive(MultiConnection)] proc macro derive, which allows to easily support more than one database backend in a single application. It can be applied to an enum of different connections:

#[derive(diesel::MultiConnection)]
pub enum AnyConnection {
    Postgresql(diesel::PgConnection),
    Mysql(diesel::MysqlConnection),
    Sqlite(diesel::SqliteConnection),
}

Afterwards the AnyConnection type can be used as ordinary connection:

fn use_multi(conn: &mut AnyConnection) -> QueryResult<()> {
   // Use the connection enum as any other connection type
   // for inserting/updating/loading/…
   diesel::insert_into(users::table)
       .values(users::name.eq("Sean"))
       .execute(conn)?;


   let users = users::table.load::<(i32, String)>(conn)?;
   Ok(())
}

By default this connection type will only support a subset of SQL that’s supported by all inner connection types. By being an enum it’s easy to fallback to backend specific SQL as soon as required. We provide this feature as derive macro so that it is possible to:

  • Select the backends you actually use
  • Allow to use third party connections as well (this requires the third party connection to be based at least on diesel 2.1 and to implement the MultiConnectionHelper trait in addition to the existing Connection trait.

Upsert support for the MySQL backend

Diesel 2.1 adds support for INSERT INTO … ON DUPLICATE KEYS … queries for the MySQL backend using the existing upsert framework. It’s now possible to write such queries using the diesel provided DSL:

diesel::insert_into(users)
    .values(&user2)
    .on_conflict(diesel::dsl::DuplicatedKeys)
    .do_update()
    .set(name.eq("I DONT KNOW ANYMORE"))
    .execute(conn)?;

Improved error messages

We spend some effort to improve error messages generated by rustc for common diesel issues further.

Consider the following example:

table! {
    users {
        id -> Integer,
        name -> Text,
    }
}


#[derive(Queryable)]
struct User {
    name: String,
    id: i32,
}




users::table.load::<User>(&mut conn)

which would generate the following error message:

error[E0277]: the trait bound `(diesel::sql_types::Integer, diesel::sql_types::Text): load_dsl::private::CompatibleType<User, Mysql>` is not satisfied
    --> src/main.rs:20:31
     |
20   |     users::table.load::<User>(&mut conn);
     |                  ----         ^^^^^^^^^ the trait `load_dsl::private::CompatibleType<User, Mysql>` is not implemented for `(diesel::sql_types::Integer, diesel::sql_types::Text)`
     |                  |
     |                  required by a bound introduced by this call
     |
     = help: the following other types implement trait `load_dsl::private::CompatibleType<U, DB>`:
               (ST0, ST1)
               (ST0, ST1, ST2)
               (ST0, ST1, ST2, ST3)
               (ST0, ST1, ST2, ST3, ST4)
               (ST0, ST1, ST2, ST3, ST4, ST5)
               (ST0, ST1, ST2, ST3, ST4, ST5, ST6)
               (ST0, ST1, ST2, ST3, ST4, ST5, ST6, ST7)
               (ST0, ST1, ST2, ST3, ST4, ST5, ST6, ST7, ST8)
             and 24 others
     = note: required for `users::table` to implement `LoadQuery<'_, _, User>`
note: required by a bound in `diesel::RunQueryDsl::load`
    --> /home/weiznich/.cargo/git/checkouts/diesel-6e3331fb3b9331ec/ef6252e/diesel/src/query_dsl/mod.rs:1543:15
     |
1543 |         Self: LoadQuery<'query, Conn, U>,
     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `diesel::RunQueryDsl::load`

This is caused by an field order mismatch between what your query returns and what your struct expects the query to return.

With diesel 2.0 we introduced the Selectable trait and a corresponding derive. That allows to automatically generate a matching select clause to prevent such issues from happening. While this already solved parts of the problem it does not solve the following case:

#[derive(Queryable, Selectable)]
struct User {
    name: i32,
    id: i32,
}


users::table.select(User::as_select()).load(&mut conn);

which generates the following error message:

error[E0277]: the trait bound `expression::select_by::SelectBy<User, _>: load_dsl::private::CompatibleType<_, _>` is not satisfied
    --> src/main.rs:20:49
     |
20   |     users::table.select(User::as_select()).load(&mut conn);
     |                                            ---- ^^^^^^^^^ the trait `load_dsl::private::CompatibleType<_, _>` is not implemented for `expression::select_by::SelectBy<User, _>`
     |                                            |
     |                                            required by a bound introduced by this call
     |
     = help: the trait `load_dsl::private::CompatibleType<U, DB>` is implemented for `expression::select_by::SelectBy<U, DB>`
     = note: required for `SelectStatement<FromClause<users::table>, query_builder::select_clause::SelectClause<expression::select_by::SelectBy<User, _>>>` to implement `LoadQuery<'_, _, _>`
note: required by a bound in `diesel::RunQueryDsl::load`
    --> /home/weiznich/.cargo/git/checkouts/diesel-6e3331fb3b9331ec/ef6252e/diesel/src/query_dsl/mod.rs:1543:15
     |
1543 |         Self: LoadQuery<'query, Conn, U>,
     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `diesel::RunQueryDsl::load`

This is caused by a type mismatch in the name field. With diesel 2.1 we now introduce an additional #[diesel(check_for_backend(diesel::backend::BackendType))] attribute that greatly improves the error messages generated for these cases. This helps pining down which field exactly causes a type mismatch.

By applying this attribute to our example:

#[derive(Queryable, Selectable)]
#[diesel(check_for_backend(diesel::mysql::Mysql))]
struct User {
    name: i32,
    id: i32,
}

we get the following error message:

error[E0277]: the trait bound `i32: FromSql<diesel::sql_types::Text, Mysql>` is not satisfied
  --> src/main.rs:13:11
   |
13 |     name: i32,
   |           ^^^ the trait `FromSql<diesel::sql_types::Text, Mysql>` is not implemented for `i32`
   |
   = help: the trait `FromSql<diesel::sql_types::Integer, Mysql>` is implemented for `i32`
   = note: required for `i32` to implement `diesel::Queryable<diesel::sql_types::Text, Mysql>`
   = note: required for `i32` to implement `FromSqlRow<diesel::sql_types::Text, Mysql>`
   = help: see issue #48214

This error message now points to the exact cause of the issue: You cannot deserialize an Text value into a i32 field. This attribute accepts one or more diesel backend type to check the struct definition against. It requires that the struct is using either both, #[derive(Queryable)] and #[derive(Selectable)] or #[derive(QueryableByName)].

Internal changes

Changes listed here are relevant for crates using the i-implement-a-third-party-backend-and-opt-into-breaking-changes feature flag. With Diesel 2.1 we have migrated some traits to use GAT. This affects the following traits:

  • RowGatWorkaround
  • ConnectionGatWorkaround
  • HasRawValue
  • HasBindCollector

These traits are removed in favour of generic associated types on the corresponding child trait.

Additionally we slightly relaxed one trait bound on BindCollector::push_bound_value to allow unsized values there as well.

Thanks

Thank you to everyone who helped make this release happen through sponsoring, bug reports, and discussion on GitHub and Gitter. While we don’t have a way to collect stats on that form of contribution, it’s greatly appreciated.

In addition to the Diesel core team, 42 people contributed code to this release. A huge thank you to:

  • 6293
  • Aleksei Orazov
  • Alexx Roche
  • AndrolGenhald
  • AndyJado
  • Artemis Livingstone
  • czotomo
  • Diana
  • Elliott Forde
  • Elrendio
  • Gorg Worgington
  • Heliozoa
  • Ian
  • Jake Goulding
  • Jeff Schwab
  • Jeremy Lardenois
  • johnmai
  • Leonardo Yvens
  • mikemcdermottredjack
  • Moritz Hedtke
  • MOZGIII
  • Neil Svedberg
  • Neo
  • Nishant Joshi
  • Oliver Cooper
  • Omid Rad
  • Pablito Labarta
  • Pavan Kumar Sunkara
  • Peter Todorov
  • Rutvik Patel
  • Sanchith Hegde
  • schlamar
  • sebasv
  • Silas McCroskey
  • Šimon Lukašík
  • Steven Chu
  • stormofice
  • Thomas Sieverding
  • Trevor Gross
  • Yuki Okushi
  • 无穷无尽的爱
  • 管唯宇

Diesel 2.1.1

Fixed

  • Fixed an issue in diesel-cli that lead to using unquoted table names in one of the internal queries
  • Fixed a bug in diesel print-schema that lead to generating invalid table! macros if both the #[sql_name] and the #[max_lenght] attribute are present
  • Fixed an issue in diesel-cli that lead to ignoring certain foreign key constraints for postgresql
  • Fixed an crash while using diesel print-schema with really old sqlite versions
  • Fixed an issue where #[diesel(check_for_backend)] ignored #[diesel(deserialize_as)] attributes
  • Fixed several issues with the new #[derive(MultiConnection)] feature
  • Fixed some edge cases in our sqlite timestamp parsing behaviour
  • diesel migration generate --diff-schema now respects table filters as setup for print-schema via diesel.toml
  • Fixed a potential breaking change around queries containing DISTINCT ON and ORDER BY clauses consisting of custom sql expressions (e.g. diesel::dsl::sql)

Added

  • Support for bigdecimal 0.4

You can support the development of diesel by sponsoring the project on github

Diesel 2.1.2

  • Fixed another potential breaking chaneg around queries containing DISTINCT ON and ORDER BY clauses consisting of custom sql expressions (e.g. .nullable())
  • Fixed an issue where #[derive(Selectable)] and #[diesel(check_for_backend)] generates invalid rust code if the struct contains lifetimes/generic types

You can support the development of diesel by contributions or by sponsoring the project on Github.

Diesel 2.1.3

  • Increased accidentally decreased limit around element count in DISTINCT ON and ORDER BY clauses again as that broke existing code

Diesel 2.1.4

  • Update libsqlite3-sys to allow version 0.27 as well

You can support the development of diesel by contributions or by sponsoring the project on Github.

Diesel 2.1.5

  • Fix impl SqlOrd postgres > postgres_backend feature flag.
  • Allow Queryable to be used with multiple table names.
  • Update libsqlite3-sys to allow version 0.28 as well

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.1.4…v2.1.5

Diesel 2.1.6

  • Fix using BoxableExpression with having clauses
  • Fix using numeric expressions with aliased fields
  • Minor documentation fixes

You can support the development of diesel by contributions or by sponsoring the project on Github.

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.1.5…v2.1.6

Diesel 2.2.0

This release wouldn’t be possible without the support of our contributors and sponsors. If you want to support diesels development, consider joining the reviewer team, submitting PR’s, help writing documentation or sponsor the maintainers.

Added

  • Support [print_schema] exclude_custom_type_definitions = ["Vector"]. If a custom type matches one element on the list it’s skipped.
  • Added automatic usage of all sqlite rowid aliases when no explicit primary key is defined for print-schema
  • Added a #[dsl::auto_type] attribute macro, allowing to infer type of query fragment functions
  • Added the same type inference on Selectable derives, which allows skipping specifying select_expression_type most of the time, in turn enabling most queries to be written using just a Selectable derive.
  • Added an optional #[diesel(skip_insertion)] field attribute to the Insertable derive macro, allowing fields which map to generated columns to be skipped during insertion.
  • Support for connection instrumentation. This allows to inspect any query run by your application
  • Logging in diesel-cli
  • Support for libsqlite3-sys 0.28
  • Add sqlite-integer-primary-key-is-bigint configuration option, usable with SQLite 3.37 or above, allowing to use BigInt for INTEGER PRIMARY KEY columns in SQLite for tables without the WITHOUT ROWID attribute (SQLite doc).
  • Support for multiple print_schema entry in diesel.toml (e.g. [print_schema.user1]), which allows generating multiple schema.rs files
  • Add support for COPY TO and COPY FROM statements
  • Add support for mapping chrono::Duration to postgresql’s INTERVAL sql type
  • Added serialize_database_to_buffer and deserialize_readonly_database_from_buffer methods in SqliteConnection to support serialization/deserialization of SQLite databases to and from byte buffers.
  • Added SerializedDatabase wrapper type for a serialized database that is dynamically allocated by calling serialize_database_to_buffer. This RAII wrapper deallocates the memory when it goes out of scope with sqlite3_free.

Changed

  • The minimal officially supported rustc version is now 1.78.0
  • Deprecated sql_function! in favour of define_sql_function! which provides compatibility with #[dsl::auto_type]
  • Deserialization error messages now contain information about the field that failed to deserialize

New Contributors

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.1.0…v2.2.0

Diesel 2.2.1

You can support the development of diesel by contributions or by sponsoring the project on Github.

  • Fixed using #[dsl::auto_type] with functions that accept reference arguments
  • Fixed using #[derive(Queryable)] with structs that use a type named Row as field type
  • Fixed a regression that prevented using mysqlclient-sys 0.2.x with diesel 2.2
  • Fixed connecting to postgres database using the scram-sha-256 authentication method on windows while using the bundled postgres builds
  • Improved the error messages in diesel-cli for cases where a file/folder was not found
  • Fixed several version detection bugs in mysqlclient-sys to use pre-generated bindings in more situations

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.2.0…v2.2.1

Diesel 2.2.2

  • Support for libsqlite3-sys 0.29.0
  • Fixed a potential panic in the sqlite cursor implementation
  • Fixed support for rust numeric operators with columns of the type Numeric
  • Removed the SerializedDatabase::new function due to unsoundness

You can support the development of diesel by contributions or by sponsoring the project on Github.

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.2.1…v2.2.2

Diesel 2.2.3

  • Support for libsqlite3-sys 0.30.0
  • Fixed a possible vulnerability in how Diesel handled protocol level bind parameters. See the SQL Injection isn’t Dead: Smuggling Queries at Protocol Level presentation from DEF CON for details
  • Fixed an issue with a possibly ambiguous trait resolution in #[derive(QueryableByName)]

You can support the development of diesel by contributions or by sponsoring the project on Github.

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.2.2…v2.2.3

Diesel 2.2.4

Fixed

  • Fix an issue where empty queries could trigger undefined behaviour in the sqlite backend

Diesel 2.2.5

  • Add a typedef for Returning and Count so that #[auto_type] works with such queries
  • Fixed an issue that allowed to pass non-boolean expressions to .and() and .or() which would result in queries failing at runtime
  • Officially deprecating the gitter room

You can support the development of diesel by contributions or by sponsoring the project on Github.

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.2.4…v2.2.5

Diesel 2.2.6

What’s Changed

  • Remove more mentions of gitter from the documentation

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.2.5…v2.2.6

Diesel 2.2.7

Fixed

  • Fixed diesel thinking a.eq_any(b) was non-nullable even if a and b were nullable.
  • Generate InstrumentationEvent::BeginTransaction for immediate and exclusive transactions in SQLite
  • Minimize the amount of duplicated code generated for diesel::debug_query
  • Updated ipnetwork to allow version 0.21.
  • Updated libsqlite3-sys to allow version 0.31.0
  • Updated pq-sys to allow version 0.7.0
  • Add support for numeric operators (+-*/) in #[diesel::auto_type]
  • Add support for joins to sub-jons to aliases

You can support the development of diesel by contributions or by sponsoring the project on Github

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.2.6…v2.2.7

Diesel 2.2.8

Fixed

  • Allow #[diesel(check_for_backend(_))] to check fields with #[diesel(embed)] annotations
  • Improve custom compile error message around CompatibleType
  • Fix a bug that restricted the number of allowed columns in COPY FROM statements to 12
  • Expose some SqliteValue helper functions
  • Use consistent whitespace in ASC/DESC, DISTINCT ON, and DELETE FROM clauses

You can support the development of diesel by contributions or by sponsoring the project on Github

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.2.7…v2.2.8

Diesel 2.2.9

Fixed

  • Fix an issue where diesel migration generate --diff-schema incorrectly uses the primary key of table B as the referenced column rather than the primary key of table A when B has a foreign key pointing to table A.
  • Bump maximal supported libsqlite3-sys version to 0.32.0 and add explicit feature entries for the uuid and serde_json feature.
  • Fixed an issue where diesel generated unnamed prepared statements would fail with an unanmed prepared statement not found error with pgbouncer.
  • Fix an issue with converting ipnet::Ipnet values with an subnet to SQL values

You can support the development of diesel by contributions or by sponsoring the project on Github

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.2.8…v2.2.9

Diesel 2.2.10

Fixed

  • Support for libsqlite3-sys 0.33.0
  • Fixed potential ambiguities in code generated by various derives

You can support the development of diesel by contributions or by sponsoring the project on Github

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.2.9…v2.2.10

Diesel 2.2.11

What’s Changed

  • Disallow mixing aggregate and non-aggregate expressions in DISTINCT ON clauses
  • Fixed an item referenced by a non-absolute path in #[derive(MultiConnection)]
  • Improved compiler errors in some cases
  • Improved the documentation for creating SqliteConnections for concurrent applications

You can support the development of Diesel by contributions or by sponsoring the project on Github

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.2.10…v2.2.11

Diesel 2.2.12

Fixed

  • Added support for libsqlite3-sys 0.35.0
  • Fixed a wrong oid for the oid[] type in the PostgreSQL backend
  • Worked around an issue with broken nullable detection with certain versions of libmysqlclient shipped by ubuntu
  • Improved compiler errors in many more cases

You can support the development of Diesel by contributions or by sponsoring the project on GitHub

Call for Input

We are looking for input on a newly designed derive to make constructing queries easier. See here for details.

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.2.11…v2.2.12

Diesel 2.3.0

This release includes a several large extensions to the query DSL provided by Diesel and also helps increases the number of platforms you can use Diesel on out of the box. Notable changes include:

  • Improved query construction via #[derive(HasQuery)]
  • Added support for window functions
  • Using SQLite with WASM in your browser
  • Extended support for various types, functions and operators in the PostgreSQL backend
  • Support for JSON and JSONB in the SQLite backend

See the release blog for the full announcement

You can support the development of Diesel by:

  • Contributing Code, Documentation or Guides. Checkout the planing for Diesel 2.4 for open tasks.
  • Providing knowledge and help to maintain the MySQL/MariaDB backend. This is currently the only in-tree backend that is not used by any maintainers, so having someone around that actually uses this backend would be very helpful for the Diesel project.
  • Answering questions in our discussion forum
  • Reporting bugs in our issue tracker
  • Helping triaging issues in our issue tracker
  • Sponsoring the maintainers.

Added

  • Added limit() and offset() DSL to combination clauses such as UNION
  • Fixed #[derive(Identifiable)] ignoring attribute #[diesel(serialize_as)] on primary keys
  • Added embedded struct support for AsChangeset via #[diesel(embed)]
  • Added a #[diesel(skip_update)] attribute for the AsChangeset derive to skip updating a field present in the struct
  • Support for libsqlite3-sys 0.35.0
  • Add support for built-in PostgreSQL range operators and functions
  • Support for postgres multirange type
  • Added diesel::r2d2::TestCustomizer, which allows users to customize their diesel::r2d2::Pools in a way that makes the pools suitable for use in parallel tests.
  • Added support for built-in PostgreSQL range operators and functions
  • Added support for various built-in PostgreSQL array functions
  • Added Json and Jsonb support for the SQLite backend.
  • Added a #[diesel::declare_sql_function] attribute macro to easily define support for multiple sql functions at once via an extern "SQL" block
  • Support [print_schema] allow_tables_to_appear_in_same_query_config = "fk_related_tables" to generate separate allow_tables_to_appear_in_same_query! calls containing only tables that are related through foreign keys. (Default: "all_tables".) It is not possible to build queries using two tables that don’t appear in the same allow_tables_to_appear_in_same_query! call, but that macro generates O(n²) rust code, so this option may be useful to reduce compilation time. (#4333)
  • Added wasm32-unknown-unknown target support for sqlite backend.
  • Add support for the CAST operator
  • Support [print_schema] allow_tables_to_appear_in_same_query_config = "none" to generate no allow_tables_to_appear_in_same_query! calls. (Default: "all_tables".). (#4333)
  • Add [print_schema] pg_domains_as_custom_types parameter to generate custom types for PostgreSQL domains that matches any of the regexes in the given list. (Default: [].) This option allows an application to selectively give special meaning for the serialization/deserialization of these types, avoiding the default behavior of treating the domain as the underlying type. (#4592)
  • Add support for batch insert and upsert statements with returning for SQLite
  • Add support for window functions and aggregate expressions.

Fixed

  • Fixed diesel thinking a.eq_any(b) was non-nullable even if a and b were nullable.
  • Generate InstrumentationEvent::BeginTransaction for immediate and exclusive transactions in SQLite
  • Use a single space instead of two spaces between DELETE FROM.
  • Diesel CLI now ensures that migration versions are always unique. If it fails to generate a unique version, it will return an error. The new version format remains compatible with older Diesel versions.
  • Updated ipnetwork to allow version 0.21.

Changed

  • Use distinct DIESEL_LOG logging filter env variable instead of the default RUST_LOG one (#4575)
  • The minimal supported Rust version is now 1.86.0

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.2.0…v2.3.0

Diesel 2.3.2

Fixed

  • Fixed an incompatibility with libmariadb versions shipped by debian
  • Fixed docs.rs builds
  • Fixed applying patch file schema.rs file with formatting
  • Allow to compare DatabaseErrorKind values

(Diesel 2.3.1 did not contain any changes beside the version bump to retrigger the docs.rs build)

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.3.0…v2.3.2

You can support the development of Diesel by:

  • Contributing Code, Documentation or Guides. Checkout the planing for Diesel 2.4 for open tasks.
  • Providing knowledge and help to maintain the MySQL/MariaDB backend. This is currently the only in-tree backend that is not used by any maintainers, so having someone around that actually uses this backend would be very helpful for the Diesel project.
  • Answering questions in our discussion forum
  • Reporting bugs in our issue tracker
  • Helping triaging issues in our issue tracker
  • Sponsoring the maintainers.

Diesel 2.3.3

Fixed

  • Fix displaying binds in instrumentations for #[derive(MultiConnection)]
  • Support artifact attestation for binaries build for releases
  • Stop using absolute paths in generated diesel.toml
  • Explicitly qualify Ok in code generated by derives to avoid naming conflicts

Starting with Diesel-CLI 2.3.3 you can verify that you downloaded the correct binaries via GitHub’s artifact attestation

gh attestation verify diesel_cli-x86_64-unknown-linux-gnu.tar.xz -R diesel-rs/diesel

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.3.2…v2.3.3

You can support the development of Diesel by:

  • Contributing Code, Documentation or Guides. Checkout the planing for Diesel 2.4 for open tasks.
  • Providing knowledge and help to maintain the MySQL/MariaDB backend. This is currently the only in-tree backend that is not used by any maintainers, so having someone around that actually uses this backend would be very helpful for the Diesel project.
  • Answering questions in our discussion forum
  • Reporting bugs in our issue tracker
  • Helping triaging issues in our issue tracker
  • Sponsoring the maintainers.

Diesel 2.3.4

Fixed

  • Fix an issue with breaking changes in libmariadb
  • Fix documentation links for helper types
  • Fix using #[diesel(embed)] with Option<Inner> types
  • Fix documentation for concurrent migration runs

You can support the development of Diesel by:

  • Contributing Code, Documentation or Guides. Checkout the planing for Diesel 2.4 for open tasks.
  • Providing knowledge and help to maintain the MySQL/MariaDB backend. This is currently the only in-tree backend that is not used by any maintainers, so having someone around that actually uses this backend would be very helpful for the Diesel project.
  • Answering questions in our discussion forum
  • Reporting bugs in our issue tracker
  • Helping triaging issues in our issue tracker
  • Sponsoring the maintainers.

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.3.3…v2.3.4

Diesel 2.3.5

Fixes

  • Fix another libmariadb related issue with time types
  • Improve compile time error messages for #[derive(Insertable)]
  • Bump supported version of sqlite-wasm-rs to 0.5.0
  • Minor documentation fixes
  • Make the returning_clauses_for_sqlite_3_35 feature enable the sqlite feature by default
  • Include a fix for a nightly rust name resolution ambiguity

You can support the development of Diesel by:

  • Contributing Code, Documentation or Guides. Checkout the planing for Diesel 2.4 for open tasks.
  • Providing knowledge and help to maintain the MySQL/MariaDB backend. This is currently the only in-tree backend that is not used by any maintainers, so having someone around that actually uses this backend would be very helpful for the Diesel project.
  • Answering questions in our discussion forum
  • Reporting bugs in our issue tracker
  • Helping triaging issues in our issue tracker
  • Sponsoring the maintainers.

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.3.4…v2.3.5

Diesel 2.3.6 Latest

Fixed

  • Added support for mysqlclient-sys 0.5.0
  • Fix generating valid schema if a column is named table
  • Fixed a regression with #[derive(Insertable)] if the same field type is used with different lifetime values

You can support the development of Diesel by:

  • Contributing Code, Documentation or Guides. Checkout the planing for Diesel 2.4 for open tasks.
  • Providing knowledge and help to maintain the MySQL/MariaDB backend. This is currently the only in-tree backend that is not used by any maintainers, so having someone around that actually uses this backend would be very helpful for the Diesel project.
  • Answering questions in our discussion forum
  • Reporting bugs in our issue tracker
  • Helping triaging issues in our issue tracker
  • Sponsoring the maintainers.

Full Changelog: https://github.com/diesel-rs/diesel/compare/v2.3.5…v2.3.6