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Add some compile tests for the new Selectable trait
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‎diesel_compile_tests/tests/fail/selectable.rs

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extern crate diesel;
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use diesel::prelude::*;
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table! {
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users {
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id -> Integer,
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name -> Text,
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}
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}
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table! {
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posts {
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id -> Integer,
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title -> Text,
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user_id -> Integer,
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}
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}
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joinable!(posts -> users(user_id));
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allow_tables_to_appear_in_same_query!(users, posts);
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#[derive(Selectable, Queryable)]
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#[table_name = "users"]
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struct UserWithEmbeddedPost {
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id: i32,
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name: String,
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#[diesel(embed)]
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post: Post,
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}
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#[derive(Selectable, Queryable)]
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#[table_name = "users"]
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struct UserWithOptionalPost {
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id: i32,
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name: String,
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#[diesel(embed)]
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post: Option<Post>,
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}
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#[derive(Selectable, Queryable)]
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#[table_name = "posts"]
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struct Post {
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id: i32,
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title: String,
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}
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#[derive(Selectable)]
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#[table_name = "posts"]
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struct PostWithWrongField {
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id: i32,
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// There is a typo here:
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titel: String
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}
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#[derive(Selectable)]
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// wrong table name here
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#[table_name = "post"]
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struct PostWithWrongTableName {
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id: i32,
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title: String,
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}
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#[derive(Queryable)]
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struct UserWithPostCount {
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id: i32,
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name: String,
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post_count: i64,
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}
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impl Selectable<diesel::pg::Pg> for UserWithPostCount {
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type SelectExpression = (users::id, users::name, diesel::dsl::count<posts::id>);
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fn selection() -> Self::SelectExpression {
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(users::id, users::name, diesel::dsl::count(posts::id))
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}
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}
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#[derive(Queryable)]
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struct UserWithoutSelectable {
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id: i32,
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name: String
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}
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fn main() {
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let conn = PgConnection::establish("").unwrap();
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// supported queries
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//
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// plain queries
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let _: Vec<Post> = posts::table.load_into(&conn).unwrap();
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// This works for inner joins
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let _: Vec<UserWithEmbeddedPost> = users::table
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.inner_join(posts::table)
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.load_into(&conn)
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.unwrap();
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// also for left joins
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let _: Vec<UserWithOptionalPost> = users::table
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.left_join(posts::table)
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.load_into(&conn)
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.unwrap();
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// allow manual impls with complex expressions
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// (and group by)
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let _ = users::table
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.inner_join(posts::table)
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.group_by(users::id)
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.load_into::<UserWithPostCount>(&conn)
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.unwrap();
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// inserts
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let _ = diesel::insert_into(posts::table)
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.values(posts::title.eq(""))
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.load_into::<Post>(&conn)
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.unwrap();
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// update
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let _ = diesel::update(posts::table)
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.set(posts::title.eq(""))
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.load_into::<Post>(&conn)
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.unwrap();
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// delete
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let _ = diesel::delete(posts::table)
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.load_into::<Post>(&conn)
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.unwrap();
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// forbidden queries
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//
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// left joins force nullable
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let _ = users::table
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.left_join(posts::table)
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.load_into::<UserWithEmbeddedPost>(&conn)
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.unwrap();
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// group by clauses are considered
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let _ = users::table
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.inner_join(posts::table)
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.group_by(posts::id)
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.load_into::<UserWithEmbeddedPost>(&conn)
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.unwrap();
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// missing group by clause
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let _ = users::table
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.inner_join(posts::table)
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.load_into::<UserWithPostCount>(&conn)
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.unwrap();
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// cannot load results from more than one table via
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// returning clauses
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let _ = diesel::insert_into(users::table)
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.values(users::name.eq(""))
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.load_into::<UserWithEmbeddedPost>(&conn)
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.unwrap();
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// cannot load results from more than one table via
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// returning clauses
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let _ = diesel::update(users::table)
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.set(users::name.eq(""))
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.load_into::<UserWithEmbeddedPost>(&conn)
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.unwrap();
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// cannot load results from more than one table via
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// returning clauses
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let _ = diesel::delete(users::table)
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.load_into::<UserWithEmbeddedPost>(&conn)
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.unwrap();
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// cannot use this method without deriving selectable
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let _ = users::table.load_into::<UserWithoutSelectable>(&conn).unwrap();
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// cannot use backend specific selectable with other backend
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let conn = SqliteConnection::establish("").unwrap();
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let _ = users::table
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.inner_join(posts::table)
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.group_by(users::id)
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.load_into::<UserWithPostCount>(&conn)
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.unwrap();
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}

‎diesel_compile_tests/tests/fail/selectable.stderr

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error[E0433]: failed to resolve: use of undeclared crate or module `post`
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--> $DIR/selectable.rs:58:16
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|
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58 | #[table_name = "post"]
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| ^^^^^^ use of undeclared crate or module `post`
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|
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= note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)
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error[E0412]: cannot find type `titel` in module `posts`
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--> $DIR/selectable.rs:53:5
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|
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53 | titel: String
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| ^^^^^^^^^^^^^ not found in `posts`
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error[E0425]: cannot find value `titel` in module `posts`
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--> $DIR/selectable.rs:53:5
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|
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53 | titel: String
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| ^^^^^^^^^^^^^ not found in `posts`
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error[E0277]: the trait bound `SelectStatement<JoinOn<diesel::query_source::joins::Join<users::table, posts::table, LeftOuter>, Grouped<diesel::expression::operators::Eq<diesel::expression::nullable::Nullable<posts::columns::user_id>, diesel::expression::nullable::Nullable<users::columns::id>>>>>: LoadIntoDsl<_, UserWithEmbeddedPost>` is not satisfied
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--> $DIR/selectable.rs:136:10
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|
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136 | .load_into::<UserWithEmbeddedPost>(&conn)
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| ^^^^^^^^^ the trait `LoadIntoDsl<_, UserWithEmbeddedPost>` is not implemented for `SelectStatement<JoinOn<diesel::query_source::joins::Join<users::table, posts::table, LeftOuter>, Grouped<diesel::expression::operators::Eq<diesel::expression::nullable::Nullable<posts::columns::user_id>, diesel::expression::nullable::Nullable<users::columns::id>>>>>`
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|
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= help: the following implementations were found:
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<SelectStatement<F, S, D, W, O, LOf, G, LC> as LoadIntoDsl<Conn, U>>
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error[E0277]: the trait bound `SelectStatement<JoinOn<diesel::query_source::joins::Join<users::table, posts::table, Inner>, Grouped<diesel::expression::operators::Eq<diesel::expression::nullable::Nullable<posts::columns::user_id>, diesel::expression::nullable::Nullable<users::columns::id>>>>, diesel::query_builder::select_clause::DefaultSelectClause, diesel::query_builder::distinct_clause::NoDistinctClause, diesel::query_builder::where_clause::NoWhereClause, diesel::query_builder::order_clause::NoOrderClause, LimitOffsetClause<NoLimitClause, NoOffsetClause>, diesel::query_builder::group_by_clause::GroupByClause<posts::columns::id>>: LoadIntoDsl<_, UserWithEmbeddedPost>` is not satisfied
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--> $DIR/selectable.rs:143:10
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|
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143 | .load_into::<UserWithEmbeddedPost>(&conn)
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| ^^^^^^^^^ the trait `LoadIntoDsl<_, UserWithEmbeddedPost>` is not implemented for `SelectStatement<JoinOn<diesel::query_source::joins::Join<users::table, posts::table, Inner>, Grouped<diesel::expression::operators::Eq<diesel::expression::nullable::Nullable<posts::columns::user_id>, diesel::expression::nullable::Nullable<users::columns::id>>>>, diesel::query_builder::select_clause::DefaultSelectClause, diesel::query_builder::distinct_clause::NoDistinctClause, diesel::query_builder::where_clause::NoWhereClause, diesel::query_builder::order_clause::NoOrderClause, LimitOffsetClause<NoLimitClause, NoOffsetClause>, diesel::query_builder::group_by_clause::GroupByClause<posts::columns::id>>`
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|
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= help: the following implementations were found:
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<SelectStatement<F, S, D, W, O, LOf, G, LC> as LoadIntoDsl<Conn, U>>
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error[E0277]: the trait bound `SelectStatement<JoinOn<diesel::query_source::joins::Join<users::table, posts::table, Inner>, Grouped<diesel::expression::operators::Eq<diesel::expression::nullable::Nullable<posts::columns::user_id>, diesel::expression::nullable::Nullable<users::columns::id>>>>>: LoadIntoDsl<_, UserWithPostCount>` is not satisfied
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--> $DIR/selectable.rs:149:10
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|
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149 | .load_into::<UserWithPostCount>(&conn)
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| ^^^^^^^^^ the trait `LoadIntoDsl<_, UserWithPostCount>` is not implemented for `SelectStatement<JoinOn<diesel::query_source::joins::Join<users::table, posts::table, Inner>, Grouped<diesel::expression::operators::Eq<diesel::expression::nullable::Nullable<posts::columns::user_id>, diesel::expression::nullable::Nullable<users::columns::id>>>>>`
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|
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= help: the following implementations were found:
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<SelectStatement<F, S, D, W, O, LOf, G, LC> as LoadIntoDsl<Conn, U>>
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error[E0277]: the trait bound `InsertStatement<users::table, ValuesClause<ColumnInsertValue<users::columns::name, diesel::expression::bound::Bound<diesel::sql_types::Text, &str>>, users::table>>: LoadIntoDsl<_, UserWithEmbeddedPost>` is not satisfied
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--> $DIR/selectable.rs:156:10
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|
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156 | .load_into::<UserWithEmbeddedPost>(&conn)
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| ^^^^^^^^^ the trait `LoadIntoDsl<_, UserWithEmbeddedPost>` is not implemented for `InsertStatement<users::table, ValuesClause<ColumnInsertValue<users::columns::name, diesel::expression::bound::Bound<diesel::sql_types::Text, &str>>, users::table>>`
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|
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= help: the following implementations were found:
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<InsertStatement<T, U, Op> as LoadIntoDsl<Conn, S>>
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error[E0277]: the trait bound `UpdateStatement<users::table, diesel::query_builder::where_clause::NoWhereClause, diesel::query_builder::update_statement::changeset::Assign<users::columns::name, diesel::expression::bound::Bound<diesel::sql_types::Text, &str>>>: LoadIntoDsl<_, UserWithEmbeddedPost>` is not satisfied
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--> $DIR/selectable.rs:163:10
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|
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163 | .load_into::<UserWithEmbeddedPost>(&conn)
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| ^^^^^^^^^ the trait `LoadIntoDsl<_, UserWithEmbeddedPost>` is not implemented for `UpdateStatement<users::table, diesel::query_builder::where_clause::NoWhereClause, diesel::query_builder::update_statement::changeset::Assign<users::columns::name, diesel::expression::bound::Bound<diesel::sql_types::Text, &str>>>`
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|
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= help: the following implementations were found:
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<UpdateStatement<T, U, V> as LoadIntoDsl<Conn, S>>
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error[E0277]: the trait bound `DeleteStatement<users::table, diesel::query_builder::where_clause::NoWhereClause>: LoadIntoDsl<_, UserWithEmbeddedPost>` is not satisfied
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--> $DIR/selectable.rs:169:10
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|
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169 | .load_into::<UserWithEmbeddedPost>(&conn)
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| ^^^^^^^^^ the trait `LoadIntoDsl<_, UserWithEmbeddedPost>` is not implemented for `DeleteStatement<users::table, diesel::query_builder::where_clause::NoWhereClause>`
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|
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= help: the following implementations were found:
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<DeleteStatement<T, U> as LoadIntoDsl<Conn, S>>
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error[E0277]: the trait bound `UserWithoutSelectable: diesel::Selectable<_>` is not satisfied
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--> $DIR/selectable.rs:173:26
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|
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173 | let _ = users::table.load_into::<UserWithoutSelectable>(&conn).unwrap();
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| ^^^^^^^^^ the trait `diesel::Selectable<_>` is not implemented for `UserWithoutSelectable`
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error[E0277]: the trait bound `SelectStatement<users::table>: LoadIntoDsl<_, UserWithoutSelectable>` is not satisfied
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--> $DIR/selectable.rs:173:26
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|
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173 | let _ = users::table.load_into::<UserWithoutSelectable>(&conn).unwrap();
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| ^^^^^^^^^ the trait `LoadIntoDsl<_, UserWithoutSelectable>` is not implemented for `SelectStatement<users::table>`
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|
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= help: the following implementations were found:
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<SelectStatement<F, S, D, W, O, LOf, G, LC> as LoadIntoDsl<Conn, U>>
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= note: required because of the requirements on the impl of `LoadIntoDsl<_, UserWithoutSelectable>` for `users::table`
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error[E0271]: type mismatch resolving `<diesel::SqliteConnection as diesel::Connection>::Backend == Pg`
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--> $DIR/selectable.rs:180:10
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|
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180 | .load_into::<UserWithPostCount>(&conn)
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| ^^^^^^^^^ expected struct `Sqlite`, found struct `Pg`

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