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use super::{Expr, IntoStatement, List};
use crate::schema::Model;
use std::{fmt, marker::PhantomData};
use toasty_core::stmt;
/// A typed insert statement for model `M`.
///
/// `Insert` represents one or more records to be created. Generated
/// create-builders (e.g., `User::create()`) produce `Insert` values under the
/// hood.
///
/// The type parameter `M` is the **returning type** — `exec()` produces the
/// newly created `M` instance(s). For inserts, the returning type always
/// matches the model being inserted.
///
/// Field values are set with [`set`](Insert::set). Collection fields can be
/// extended with [`insert`](Insert::insert) and [`insert_all`](Insert::insert_all).
pub struct Insert<M> {
pub(crate) untyped: stmt::Insert,
_p: PhantomData<M>,
}
impl<M: Model> Insert<M> {
/// Create an insert statement with a single blank record.
///
/// Fields marked `#[auto]` are set to [`Expr::Default`](toasty_core::stmt::Expr::Default)
/// (the database generates the value). All other fields are initialized to
/// `NULL`. The caller must fill in required fields with [`set`](Insert::set)
/// before executing; the blank record is not guaranteed to be valid on its
/// own.
///
/// # Examples
///
/// ```
/// # #[derive(Debug, toasty::Model)]
/// # struct User {
/// # #[key]
/// # id: i64,
/// # name: String,
/// # }
/// use toasty::stmt::Insert;
///
/// let mut insert = Insert::<User>::blank_single();
/// // Fill in the required fields
/// insert.set(0, toasty_core::stmt::Value::from(1_i64));
/// insert.set(1, toasty_core::stmt::Value::from("Alice"));
/// ```
pub fn blank_single() -> Self {
Self {
untyped: stmt::Insert {
target: stmt::InsertTarget::Model(M::id()),
source: stmt::Query::new_single(vec![
stmt::ExprRecord::from_vec(
M::schema()
.as_root_unwrap()
.fields
.iter()
.map(|field| match field.auto() {
Some(_) => stmt::Expr::Default,
None => stmt::Expr::Value(stmt::Value::Null),
})
.collect(),
)
.into(),
]),
returning: Some(stmt::Returning::Model { include: vec![] }),
},
_p: PhantomData,
}
}
/// Wrap a raw untyped [`stmt::Insert`](toasty_core::stmt::Insert).
///
/// # Examples
///
/// ```
/// # #[derive(Debug, toasty::Model)]
/// # struct User {
/// # #[key]
/// # id: i64,
/// # name: String,
/// # }
/// use toasty::stmt::Insert;
/// use toasty::schema::Register;
///
/// // Construct from a raw untyped insert
/// let raw = toasty_core::stmt::Insert {
/// target: toasty_core::stmt::InsertTarget::Model(
/// <User as Register>::id(),
/// ),
/// source: toasty_core::stmt::Query::unit(),
/// returning: None,
/// };
/// let _typed = Insert::<User>::from_untyped(raw);
/// ```
pub const fn from_untyped(untyped: stmt::Insert) -> Self {
Self {
untyped,
_p: PhantomData,
}
}
/// Set the scope of the insert.
///
/// # Examples
///
/// ```
/// # #[derive(Debug, toasty::Model)]
/// # struct User {
/// # #[key]
/// # id: i64,
/// # name: String,
/// # }
/// use toasty::stmt::Insert;
///
/// let mut insert = Insert::<User>::blank_single();
/// // Scope the insert to all users (used by association inserts)
/// insert.set_scope(User::all());
/// ```
pub fn set_scope<S>(&mut self, scope: S)
where
S: IntoStatement<Returning = List<M>>,
{
self.untyped.target =
stmt::InsertTarget::Scope(Box::new(scope.into_statement().into_untyped_query()));
}
/// Set the value of the field at `field` index in the current record.
///
/// # Examples
///
/// ```
/// # #[derive(Debug, toasty::Model)]
/// # struct User {
/// # #[key]
/// # id: i64,
/// # name: String,
/// # }
/// use toasty::stmt::Insert;
///
/// let mut insert = Insert::<User>::blank_single();
/// insert.set(0, toasty_core::stmt::Value::from(1_i64));
/// insert.set(1, toasty_core::stmt::Value::from("Alice"));
/// ```
pub fn set(&mut self, field: usize, expr: impl Into<stmt::Expr>) {
*self.expr_mut(field) = expr.into();
}
/// Append a single value to the list field at `field` index.
///
/// If the field is currently `NULL`, it is replaced with a new single-element
/// list. If it is already a list, `expr` is appended.
///
/// # Examples
///
/// ```
/// # #[derive(Debug, toasty::Model)]
/// # struct User {
/// # #[key]
/// # id: i64,
/// # name: String,
/// # }
/// use toasty::stmt::Insert;
///
/// let mut insert = Insert::<User>::blank_single();
/// // Append a value to a list field (field index 1 for illustration)
/// insert.insert(1, toasty_core::stmt::Value::from("tag1"));
/// insert.insert(1, toasty_core::stmt::Value::from("tag2"));
/// ```
pub fn insert(&mut self, field: usize, expr: impl Into<stmt::Expr>) {
// self.expr_mut(field).push(expr);
let target = self.expr_mut(field);
match target {
stmt::Expr::Value(stmt::Value::Null) => {
*target = stmt::Expr::list_from_vec(vec![expr.into()]);
}
stmt::Expr::List(expr_list) => {
expr_list.items.push(expr.into());
}
_ => todo!("existing={target:#?}; expr={:#?}", expr.into()),
}
}
/// Merge a list expression into the list field at `field` index,
/// extending any existing list.
///
/// If the field is currently `NULL`, it is replaced with `expr`. If both
/// are lists, the items from `expr` are appended to the existing list.
///
/// # Examples
///
/// ```
/// # #[derive(Debug, toasty::Model)]
/// # struct User {
/// # #[key]
/// # id: i64,
/// # name: String,
/// # }
/// use toasty::stmt::Insert;
///
/// let mut insert = Insert::<User>::blank_single();
/// let list = toasty_core::stmt::Expr::list([
/// toasty_core::stmt::Expr::Value(toasty_core::stmt::Value::from("a")),
/// toasty_core::stmt::Expr::Value(toasty_core::stmt::Value::from("b")),
/// ]);
/// insert.insert_all(1, list);
/// ```
pub fn insert_all(&mut self, field: usize, expr: impl Into<stmt::Expr>) {
let target = self.expr_mut(field);
let incoming = expr.into();
match target {
stmt::Expr::Value(stmt::Value::Null) => {
*target = incoming;
}
stmt::Expr::List(existing) => {
if let stmt::Expr::List(incoming_list) = incoming {
existing.items.extend(incoming_list.items);
} else {
existing.items.push(incoming);
}
}
_ => todo!("existing={target:#?}; expr={:#?}", incoming),
}
}
pub(crate) fn merge(&mut self, stmt: Self) {
self.untyped.merge(stmt.untyped);
}
fn expr_mut(&mut self, field: usize) -> &mut stmt::Expr {
&mut self.current_mut()[field]
}
/// Returns the current record being updated
fn current_mut(&mut self) -> &mut stmt::ExprRecord {
let values = self.untyped.source.body.as_values_mut_unwrap();
values.rows.last_mut().unwrap().as_record_mut_unwrap()
}
/// Convert this insert into a list expression.
///
/// The resulting [`Expr<List<M>>`] wraps the insert as a sub-statement,
/// which can be used as the right-hand side of an association
/// [`insert`](Association::insert) call or embedded in other expressions.
///
/// # Examples
///
/// ```
/// # #[derive(Debug, toasty::Model)]
/// # struct User {
/// # #[key]
/// # id: i64,
/// # name: String,
/// # }
/// use toasty::stmt::{Insert, Expr, List};
///
/// let insert = Insert::<User>::blank_single();
/// let _expr: Expr<List<User>> = insert.into_list_expr();
/// ```
pub fn into_list_expr(self) -> Expr<List<M>> {
Expr::from_untyped(stmt::Expr::Stmt(self.untyped.into()))
}
}
impl<M> Clone for Insert<M> {
fn clone(&self) -> Self {
Self {
untyped: self.untyped.clone(),
_p: PhantomData,
}
}
}
impl<M> From<Insert<M>> for stmt::Expr {
fn from(value: Insert<M>) -> Self {
Self::stmt(value.untyped)
}
}
impl<M> fmt::Debug for Insert<M> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.untyped.fmt(f)
}
}