pub fn build(
    query_arguments: &QueryArguments,
    base_model: &ModelRef, // The model the ordering will start from
) -> (Vec<OrderDefinition<'static>>, Vec<JoinData<'static>>) {
    let needs_reversed_order = query_arguments.needs_reversed_order();

    let mut order_definitions = vec![];
    let mut joins = vec![];

    // The index is used to differentiate potentially separate relations to the same model.
    for (index, order_by) in query_arguments.order_by.iter().enumerate() {
        // This is the final column identifier to be used for the scalar field to order by.
        // - If it's on the base model with no hops, it's for example `modelTable.field`.
        // - If it is with several hops, it's the alias used for the last join, e.g.
        //   `orderby_{modelname}_{index}.field`
        let order_by_column = if !order_by.path.is_empty() {
            let last_rf = order_by.path.last().unwrap();

            Column::from((
                format!("orderby_{}_{}", &last_rf.related_model().name, index),
                order_by.field.db_name().to_owned(),
            ))
        } else {
            order_by.field.as_column()
        };

        for rf in order_by.path.iter() {
            let (left_fields, right_fields) = if rf.is_inlined_on_enclosing_model() {
                (rf.scalar_fields(), rf.referenced_fields())
            } else {
                (
                    rf.related_field().referenced_fields(),
                    rf.related_field().scalar_fields(),
                )
            };

            // `rf` is always the relation field on the left model in the join (parent).
            let left_table_alias = if rf.model().name != base_model.name {
                Some(format!("orderby_{}_{}", &rf.model().name, index))
            } else {
                None
            };

            let right_table_alias = format!("orderby_{}_{}", &rf.related_model().name, index);

            let related_model = rf.related_model();
            let pairs = left_fields.into_iter().zip(right_fields.into_iter());

            let on_conditions = pairs
                .map(|(a, b)| {
                    let a_col = if let Some(alias) = left_table_alias.clone() {
                        Column::from((alias, a.db_name().to_owned()))
                    } else {
                        a.as_column()
                    };

                    let b_col = Column::from((right_table_alias.clone(), b.db_name().to_owned()));

                    a_col.equals(b_col)
                })
                .collect::<Vec<_>>();

            joins.push(
                related_model
                    .as_table()
                    .alias(right_table_alias.clone())
                    .on(ConditionTree::single(on_conditions)),
            );
        }

        match (order_by.sort_order, needs_reversed_order) {
            (SortOrder::Ascending, true) => order_definitions.push(order_by_column.descend()),
            (SortOrder::Descending, true) => order_definitions.push(order_by_column.ascend()),
            (SortOrder::Ascending, false) => order_definitions.push(order_by_column.ascend()),
            (SortOrder::Descending, false) => order_definitions.push(order_by_column.descend()),
        }
    }

    (order_definitions, joins)
}
/// Builds all expressions for an `ORDER BY` clause based on the query arguments.
Builds all expressions for an `ORDER BY` clause based on the query arguments.
Builds all expressions for an ` ORDER BY ` clause based on the query arguments .
pub fn build(
    query_arguments: &QueryArguments,
    base_model: &ModelRef, // The model the ordering will start from
) -> (Vec<OrderDefinition<'static>>, Vec<JoinData<'static>>) {
    let needs_reversed_order = query_arguments.needs_reversed_order();
    let mut order_definitions = vec![];
    let mut joins = vec![];
    // The index is used to differentiate potentially separate relations to the same model.
    for (index, order_by) in query_arguments.order_by.iter().enumerate() {
        // This is the final column identifier to be used for the scalar field to order by.
        // - If it's on the base model with no hops, it's for example `modelTable.field`.
        // - If it is with several hops, it's the alias used for the last join, e.g.
        //   `orderby_{modelname}_{index}.field`
        let order_by_column = if !order_by.path.is_empty() {
            let last_rf = order_by.path.last().unwrap();
            Column::from((
                format!("orderby_{}_{}", &last_rf.related_model().name, index),
                order_by.field.db_name().to_owned(),
            ))
        } else {
            order_by.field.as_column()
        };
        for rf in order_by.path.iter() {
            let (left_fields, right_fields) = if rf.is_inlined_on_enclosing_model() {
                (rf.scalar_fields(), rf.referenced_fields())
            } else {
                (
                    rf.related_field().referenced_fields(),
                    rf.related_field().scalar_fields(),
                )
            };
            // `rf` is always the relation field on the left model in the join (parent).
            let left_table_alias = if rf.model().name != base_model.name {
                Some(format!("orderby_{}_{}", &rf.model().name, index))
            } else {
                None
            };
            let right_table_alias = format!("orderby_{}_{}", &rf.related_model().name, index);
            let related_model = rf.related_model();
            let pairs = left_fields.into_iter().zip(right_fields.into_iter());
            let on_conditions = pairs
                .map(|(a, b)| {
                    let a_col = if let Some(alias) = left_table_alias.clone() {
                        Column::from((alias, a.db_name().to_owned()))
                    } else {
                        a.as_column()
                    };
                    let b_col = Column::from((right_table_alias.clone(), b.db_name().to_owned()));
                    a_col.equals(b_col)
                })
                .collect::<Vec<_>>();
            joins.push(
                related_model
                    .as_table()
                    .alias(right_table_alias.clone())
                    .on(ConditionTree::single(on_conditions)),
            );
        }
        match (order_by.sort_order, needs_reversed_order) {
            (SortOrder::Ascending, true) => order_definitions.push(order_by_column.descend()),
            (SortOrder::Descending, true) => order_definitions.push(order_by_column.ascend()),
            (SortOrder::Ascending, false) => order_definitions.push(order_by_column.ascend()),
            (SortOrder::Descending, false) => order_definitions.push(order_by_column.descend()),
        }
    }
    (order_definitions, joins)
}
pub fn build ( query_arguments : & QueryArguments , base_model : & ModelRef , // The model the ordering will start from ) -> ( Vec < OrderDefinition < ' static > > , Vec < JoinData < ' static > > ) { let needs_reversed_order = query_arguments . needs_reversed_order ( ) ; let mut order_definitions = vec ! [ ] ; let mut joins = vec ! [ ] ; // The index is used to differentiate potentially separate relations to the same model. for ( index , order_by ) in query_arguments . order_by . iter ( ) . enumerate ( ) { // This is the final column identifier to be used for the scalar field to order by. // - If it's on the base model with no hops, it's for example `modelTable.field`. // - If it is with several hops, it's the alias used for the last join, e.g. //   `orderby_{modelname}_{index}.field` let order_by_column = if ! order_by . path . is_empty ( ) { let last_rf = order_by . path . last ( ) . unwrap ( ) ; Column :: from ( ( format ! ( " " last_rf related_model ( ) name index ) , order_by . field . db_name ( ) . to_owned ( ) , ) ) } else { order_by . field . as_column ( ) } ; for rf in order_by . path . iter ( ) { let ( left_fields , right_fields ) = if rf . is_inlined_on_enclosing_model ( ) { ( rf . scalar_fields ( ) , rf . referenced_fields ( ) ) } else { ( rf . related_field ( ) . referenced_fields ( ) , rf . related_field ( ) . scalar_fields ( ) , ) } ; // `rf` is always the relation field on the left model in the join (parent). let left_table_alias = if rf . model ( ) . name != base_model . name { Some ( format ! ( " " rf model ( ) name index ) ) } else { None } ; let right_table_alias = format ! ( " " rf related_model ( ) name index ) ; let related_model = rf . related_model ( ) ; let pairs = left_fields . into_iter ( ) . zip ( right_fields . into_iter ( ) ) ; let on_conditions = pairs . map ( | ( a , b ) | { let a_col = if let Some ( alias ) = left_table_alias . clone ( ) { Column :: from ( ( alias , a . db_name ( ) . to_owned ( ) ) ) } else { a . as_column ( ) } ; let b_col = Column :: from ( ( right_table_alias . clone ( ) , b . db_name ( ) . to_owned ( ) ) ) ; a_col . equals ( b_col ) } ) . collect :: < Vec < _ > > ( ) ; joins . push ( related_model . as_table ( ) . alias ( right_table_alias . clone ( ) ) . on ( ConditionTree :: single ( on_conditions ) ) , ) ; } match ( order_by . sort_order , needs_reversed_order ) { ( SortOrder :: Ascending , true ) => order_definitions . push ( order_by_column . descend ( ) ) , ( SortOrder :: Descending , true ) => order_definitions . push ( order_by_column . ascend ( ) ) , ( SortOrder :: Ascending , false ) => order_definitions . push ( order_by_column . ascend ( ) ) , ( SortOrder :: Descending , false ) => order_definitions . push ( order_by_column . descend ( ) ) , } } ( order_definitions , joins ) }
Builds all expressions for an `ORDER BY` clause based on the query arguments.
Builds all expressions for an ` ORDER BY ` clause based on the query arguments .
query_arguments
&QueryArguments
base_model
&ModelRef
query_arguments
&QueryArguments
base_model
&ModelRef