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use crate::{ColumnTrait, EntityTrait, Iterable, QueryFilter, QueryOrder, QuerySelect, QueryTrait}; use core::fmt::Debug; use core::marker::PhantomData; pub use sea_query::JoinType; use sea_query::{DynIden, IntoColumnRef, IntoIden, SeaRc, SelectStatement, SimpleExpr}; #[derive(Clone, Debug)] pub struct Select<E> where E: EntityTrait, { pub(crate) query: SelectStatement, pub(crate) entity: PhantomData<E>, } #[derive(Clone, Debug)] pub struct SelectTwo<E, F> where E: EntityTrait, F: EntityTrait, { pub(crate) query: SelectStatement, pub(crate) entity: PhantomData<(E, F)>, } #[derive(Clone, Debug)] pub struct SelectTwoMany<E, F> where E: EntityTrait, F: EntityTrait, { pub(crate) query: SelectStatement, pub(crate) entity: PhantomData<(E, F)>, } pub trait IntoSimpleExpr { fn into_simple_expr(self) -> SimpleExpr; } macro_rules! impl_trait { ( $trait: ident ) => { impl<E> $trait for Select<E> where E: EntityTrait, { type QueryStatement = SelectStatement; fn query(&mut self) -> &mut SelectStatement { &mut self.query } } impl<E, F> $trait for SelectTwo<E, F> where E: EntityTrait, F: EntityTrait, { type QueryStatement = SelectStatement; fn query(&mut self) -> &mut SelectStatement { &mut self.query } } impl<E, F> $trait for SelectTwoMany<E, F> where E: EntityTrait, F: EntityTrait, { type QueryStatement = SelectStatement; fn query(&mut self) -> &mut SelectStatement { &mut self.query } } }; } impl_trait!(QuerySelect); impl_trait!(QueryFilter); impl_trait!(QueryOrder); impl<C> IntoSimpleExpr for C where C: ColumnTrait, { fn into_simple_expr(self) -> SimpleExpr { SimpleExpr::Column(self.as_column_ref().into_column_ref()) } } impl IntoSimpleExpr for SimpleExpr { fn into_simple_expr(self) -> SimpleExpr { self } } impl<E> Select<E> where E: EntityTrait, { pub(crate) fn new() -> Self { Self { query: SelectStatement::new(), entity: PhantomData, } .prepare_select() .prepare_from() } fn prepare_select(mut self) -> Self { self.query.columns(self.column_list()); self } fn column_list(&self) -> Vec<(DynIden, E::Column)> { let table = SeaRc::new(E::default()) as DynIden; E::Column::iter().map(|col| (table.clone(), col)).collect() } fn prepare_from(mut self) -> Self { self.query.from(E::default().into_iden()); self } } impl<E> QueryTrait for Select<E> where E: EntityTrait, { type QueryStatement = SelectStatement; fn query(&mut self) -> &mut SelectStatement { &mut self.query } fn as_query(&self) -> &SelectStatement { &self.query } fn into_query(self) -> SelectStatement { self.query } } macro_rules! select_two { ( $selector: ident ) => { impl<E, F> QueryTrait for $selector<E, F> where E: EntityTrait, F: EntityTrait, { type QueryStatement = SelectStatement; fn query(&mut self) -> &mut SelectStatement { &mut self.query } fn as_query(&self) -> &SelectStatement { &self.query } fn into_query(self) -> SelectStatement { self.query } } }; } select_two!(SelectTwo); select_two!(SelectTwoMany);