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#![allow(non_camel_case_types)]
use diesel::backend::Backend;
use diesel::expression::{
IsContainedInGroupBy, ValidGrouping, is_aggregate, is_contained_in_group_by,
};
use diesel::internal::table_macro::{FromClause, SelectStatement};
use diesel::prelude::*;
use diesel::query_builder::{AsQuery, AstPass, QueryFragment, QueryId};
use diesel::query_source::{AppearsInFromClause, Once, Table as TableTrait};
use diesel::sql_types::{Text, Uuid};
pub use self::columns::*;
pub mod columns {
use super::*;
macro_rules! col {
($col:ident, $sql_type:ty) => {
pub struct $col;
impl Expression for $col {
type SqlType = $sql_type;
}
impl<'a, QS> AppearsOnTable<QS> for $col where
QS: AppearsInFromClause<super::Table<'a>, Count = Once>
{
}
impl<'a> SelectableExpression<super::Table<'a>> for $col {}
impl ValidGrouping<()> for $col {
type IsAggregate = is_aggregate::No;
}
impl<GB> ValidGrouping<GB> for $col
where
GB: IsContainedInGroupBy<$col, Output = is_contained_in_group_by::Yes>,
{
type IsAggregate = is_aggregate::Yes;
}
impl<'a> Column for $col {
type Table = Table<'static>;
const NAME: &'static str = stringify!($col);
}
impl<DB> QueryFragment<DB> for $col
where
DB: Backend,
{
fn walk_ast<'b>(&'b self, mut pass: AstPass<'_, 'b, DB>) -> QueryResult<()> {
pass.push_identifier(<$col as Column>::NAME)?;
Ok(())
}
}
impl QueryId for $col {
type QueryId = $col;
const HAS_STATIC_QUERY_ID: bool = true;
}
};
}
col!(id, Uuid);
col!(username, Text);
col!(token, Text);
}
//pub const all_columns: <Table<'static> as TableTrait>::AllColumns = (id, username, token);
pub type SqlType = (Uuid, Text, Text);
#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)]
pub struct Table<'a> {
name: &'a str,
schema: Option<&'a str>,
}
impl<'a> Table<'a> {
pub fn new(name: &'a str, schema: Option<&'a str>) -> Self {
Self { name, schema }
}
}
impl QuerySource for Table<'_> {
type FromClause = Self;
type DefaultSelection = <Self as TableTrait>::AllColumns;
fn from_clause(&self) -> Self::FromClause {
self.clone()
}
fn default_selection(&self) -> Self::DefaultSelection {
<Self as TableTrait>::all_columns()
}
}
impl AsQuery for Table<'_> {
type SqlType = SqlType;
type Query = SelectStatement<FromClause<Self>>;
fn as_query(self) -> Self::Query {
SelectStatement::simple(self)
}
}
impl TableTrait for Table<'_>
where
Self: QuerySource + AsQuery,
{
type PrimaryKey = id;
type AllColumns = (id, username, token);
fn primary_key(&self) -> Self::PrimaryKey {
id
}
fn all_columns() -> Self::AllColumns {
(id, username, token)
}
}
impl<DB> QueryFragment<DB> for Table<'_>
where
DB: Backend,
{
fn walk_ast<'b>(&'b self, mut pass: AstPass<'_, 'b, DB>) -> QueryResult<()> {
if let Some(ref schema) = self.schema {
pass.push_identifier(schema)?;
pass.push_sql(".");
}
pass.push_identifier(self.name)?;
Ok(())
}
}
impl QueryId for Table<'_> {
type QueryId = ();
const HAS_STATIC_QUERY_ID: bool = false;
}
impl AppearsInFromClause<Table<'_>> for Table<'_> {
type Count = Once;
}
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