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use crate::{statements::ArelStatement, Arel};
use std::marker::PhantomData;
pub enum JoinConst {
LeftJoin,
InnerJoin,
RightJoin,
FullOuterJoin,
CrossJoin,
}
impl std::fmt::Display for JoinConst {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
match self {
JoinConst::LeftJoin => write!(f, "LEFT JOIN"),
JoinConst::InnerJoin => write!(f, "INNER JOIN"),
JoinConst::RightJoin => write!(f, "RIGHT JOIN"),
JoinConst::FullOuterJoin => write!(f, "FULL OUTER JOIN"),
JoinConst::CrossJoin => write!(f, "CROSS JOIN"),
}
}
}
#[derive(Debug)]
pub struct Join<M: Arel> {
sqls: Vec<crate::Sql>,
_marker: PhantomData<M>,
}
impl<M: Arel> ArelStatement for Join<M> {
fn to_sql(&self) -> crate::Result<Option<crate::Sql>> {
if self.sqls.len() > 0 {
let mut final_sql = crate::Sql::new("");
final_sql.push_sqls(self.sqls.clone(), " ");
Ok(Some(final_sql))
} else {
Ok(None)
}
}
}
impl<M: Arel> Default for Join<M> {
fn default() -> Self {
Self {
sqls: vec![],
_marker: PhantomData::<M>,
}
}
}
impl<M: Arel> Join<M> {
/// # Examples
///
/// ```
/// use arel::prelude::*;
/// use arel::statements::join::Join;
/// #[arel]
/// struct User {}
/// impl Arel for User {}
/// #[arel]
/// struct Wallet {}
/// impl Arel for Wallet {}
/// let mut join = Join::<User>::default();
/// join.join::<Wallet>(arel::JoinConst::InnerJoin);
/// assert_eq!(join.to_sql().unwrap().unwrap().to_sql_string().unwrap(), r#"INNER JOIN "wallet" ON "user"."id" = "wallet"."user_id""#);
///
/// #[arel]
/// struct Admin {
/// #[arel(primary_key)]
/// id: i32,
/// #[arel(primary_key)]
/// uuid: String,
/// }
/// impl Arel for Admin {}
/// let mut join = Join::<Admin>::default();
/// join.join::<Wallet>(arel::JoinConst::InnerJoin);
/// assert_eq!(join.to_sql().unwrap().unwrap().to_sql_string().unwrap(), r#"INNER JOIN "wallet" ON "admin"."id" = "wallet"."admin_id" AND "admin"."uuid" = "wallet"."admin_uuid""#);
///
/// ```
pub fn join<U: Arel>(&mut self, join_type: JoinConst) -> &mut Self {
let m_table_name = M::table_name();
let u_table_name = U::table_name();
let m_primary_keys = M::primary_keys();
let mut sql = crate::Sql::new(format!(r#"{} "{}" ON "#, join_type.to_string(), u_table_name));
for (idx, m_primary_key) in m_primary_keys.iter().enumerate() {
if idx >= 1 {
sql.push_str(" AND ");
}
let u_m_foreign_key = format!("{}_{}", m_table_name, m_primary_key);
sql.push_str(format!(r#""{}"."{}" = "{}"."{}""#, m_table_name, m_primary_key, u_table_name, u_m_foreign_key));
}
self.sqls.push(sql);
self
}
/// # Examples
///
/// ```
/// use arel::prelude::*;
/// use arel::statements::join::Join;
/// #[arel]
/// struct User {}
/// impl Arel for User {}
/// let mut join = Join::<User>::default();
/// join.join_sql("LEFT JOIN wallet ON user.id = wallet.user_id");
/// join.join_sql("INNER JOIN order ON user.id = order.user_id");
/// assert_eq!(join.to_sql().unwrap().unwrap().to_sql_string().unwrap(), r#"LEFT JOIN wallet ON user.id = wallet.user_id INNER JOIN order ON user.id = order.user_id"#);
///
/// ```
pub fn join_sql<S: Into<crate::Sql>>(&mut self, sql: S) -> &mut Self {
self.sqls.push(sql.into());
self
}
}