Document model macros

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Bat 2018-09-29 11:05:05 +01:00 committed by Igor Galić
parent 743620eb6a
commit bd80430b1b
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@ -32,6 +32,19 @@ pub type Connection = diesel::SqliteConnection;
#[cfg(all(not(feature = "sqlite"), feature = "postgres"))]
pub type Connection = diesel::PgConnection;
/// Adds a function to a model, that returns the first
/// matching row for a given list of fields.
///
/// Usage:
///
/// ```rust
/// impl Model {
/// find_by!(model_table, name_of_the_function, field1 as String, field2 as i32);
/// }
///
/// // Get the Model with field1 == "", and field2 == 0
/// Model::name_of_the_function(connection, String::new(), 0);
/// ```
macro_rules! find_by {
($table:ident, $fn:ident, $($col:ident as $type:ident),+) => {
/// Try to find a $table with a given $col
@ -46,6 +59,18 @@ macro_rules! find_by {
};
}
/// List all rows of a model, with field-based filtering.
///
/// Usage:
///
/// ```rust
/// impl Model {
/// list_by!(model_table, name_of_the_function, field1 as String);
/// }
///
/// // To get all Models with field1 == ""
/// Model::name_of_the_function(connection, String::new());
/// ```
macro_rules! list_by {
($table:ident, $fn:ident, $($col:ident as $type:ident),+) => {
/// Try to find a $table with a given $col
@ -58,6 +83,18 @@ macro_rules! list_by {
};
}
/// Adds a function to a model to retrieve a row by ID
///
/// # Usage
///
/// ```rust
/// impl Model {
/// get!(model_table);
/// }
///
/// // Get the Model with ID 1
/// Model::get(connection, 1);
/// ```
macro_rules! get {
($table:ident) => {
pub fn get(conn: &crate::Connection, id: i32) -> Option<Self> {
@ -70,6 +107,18 @@ macro_rules! get {
};
}
/// Adds a function to a model to insert a new row
///
/// # Usage
///
/// ```rust
/// impl Model {
/// insert!(model_table, NewModelType);
/// }
///
/// // Insert a new row
/// Model::insert(connection, NewModelType::new());
/// ```
macro_rules! insert {
($table:ident, $from:ident) => {
last!($table);
@ -84,6 +133,21 @@ macro_rules! insert {
};
}
/// Adds a function to a model to save changes to a model.
/// The model should derive diesel::AsChangeset.
///
/// # Usage
///
/// ```rust
/// impl Model {
/// update!(model_table);
/// }
///
/// // Update and save changes
/// let m = Model::get(connection, 1);
/// m.foo = 42;
/// m.update(connection);
/// ```
macro_rules! update {
($table:ident) => {
pub fn update(&self, conn: &crate::Connection) -> Self {
@ -97,6 +161,18 @@ macro_rules! update {
};
}
/// Returns the last row of a table.
///
/// # Usage
///
/// ```rust
/// impl Model {
/// last!(model_table);
/// }
///
/// // Get the last Model
/// Model::last(connection)
/// ```
macro_rules! last {
($table:ident) => {
pub fn last(conn: &crate::Connection) -> Self {