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use crate::{prelude::Arel, statements::ArelStatement};
use std::marker::PhantomData;
#[derive(Debug)]
pub struct Order<M: Arel> {
sqls: Vec<crate::Sql>,
_marker: PhantomData<M>,
}
impl<M: Arel> ArelStatement for Order<M> {
fn sqls(&self) -> Option<&Vec<crate::Sql>> {
if self.sqls.len() > 0 {
Some(&self.sqls)
} else {
None
}
}
fn to_sql(&self) -> Option<crate::Sql> {
if let Some(sqls) = self.sqls() {
let mut final_sql = crate::Sql::new("ORDER BY ");
for (idx, sql) in sqls.iter().enumerate() {
if idx >= 1 {
final_sql.push_str(", ");
}
final_sql.push_sql(sql.clone());
}
Some(final_sql)
} else {
None
}
}
}
impl<M: Arel> Order<M> {
/// # Examples
///
/// ```
/// use arel::prelude::*;
/// use arel::statements::order::Order;
/// #[arel]
/// struct User {}
/// impl Arel for User {}
/// let order = Order::<User>::new("name", arel::SortType::Desc);
/// assert_eq!(order.to_sql().unwrap().to_sql_string().unwrap(), r#"ORDER BY "user"."name" DESC"#);
///
/// ```
pub fn new<T: AsRef<str>>(column: T, sort_type: crate::SortType) -> Self {
Self::new_columns(vec![(column, sort_type)])
}
/// # Examples
///
/// ```
/// use arel::prelude::*;
/// use arel::statements::order::Order;
/// #[arel]
/// struct User {}
/// impl Arel for User {}
/// let order = Order::<User>::new_columns(vec![("name", arel::SortType::Desc), ("age", arel::SortType::Asc)]);
/// assert_eq!(order.to_sql().unwrap().to_sql_string().unwrap(), r#"ORDER BY "user"."name" DESC, "user"."age" ASC"#);
///
/// ```
pub fn new_columns<T: AsRef<str>>(columns: Vec<(T, crate::SortType)>) -> Self {
let table_name = M::table_name();
Self {
sqls: columns
.iter()
.map(|column| crate::Sql::new(format!(r#""{}"."{}" {}"#, table_name, column.0.as_ref(), column.1.to_string())))
.collect(),
_marker: PhantomData::<M>,
}
}
pub fn new_sql<S: Into<crate::Sql>>(sql: S) -> Self {
Self {
sqls: vec![sql.into()],
_marker: PhantomData::<M>,
}
}
/// # Examples
///
/// ```
/// use arel::prelude::*;
/// use arel::statements::order::Order;
/// #[arel]
/// struct User {}
/// impl Arel for User {}
/// let order = Order::<User>::new_sqls(vec!["name DESC", "age ASC"]);
/// assert_eq!(order.to_sql().unwrap().to_sql_string().unwrap(), r#"ORDER BY name DESC, age ASC"#);
///
/// ```
pub fn new_sqls<S: Into<crate::Sql>>(sqls: Vec<S>) -> Self {
Self {
sqls: sqls.into_iter().map(|sql| sql.into()).collect(),
_marker: PhantomData::<M>,
}
}
pub fn append<T: AsRef<str>>(&mut self, column: T, sort_type: crate::SortType) -> &mut Self {
let table_name = M::table_name();
self.sqls.push(crate::Sql::new(format!(r#""{}"."{}" {}"#, table_name, column.as_ref(), sort_type.to_string())));
self
}
pub fn append_sql<S: Into<crate::Sql>>(&mut self, sql: S) -> &mut Self {
self.sqls.push(sql.into());
self
}
}