Flowdock
method

make_constraints

Importance_0
v7.0.0 - Show latest stable - 0 notes - Class: JoinDependency
make_constraints(parent, child, join_type) private

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# File activerecord/lib/active_record/associations/join_dependency.rb, line 190
        def make_constraints(parent, child, join_type)
          foreign_table = parent.table
          foreign_klass = parent.base_klass
          child.join_constraints(foreign_table, foreign_klass, join_type, alias_tracker) do |reflection|
            table, terminated = @joined_tables[reflection]
            root = reflection == child.reflection

            if table && (!root || !terminated)
              @joined_tables[reflection] = [table, root] if root
              next table, true
            end

            table_name = @references[reflection.name.to_sym]&.to_s

            table = alias_tracker.aliased_table_for(reflection.klass.arel_table, table_name) do
              name = reflection.alias_candidate(parent.table_name)
              root ? name : "#{name}_join"
            end

            @joined_tables[reflection] ||= [table, root] if join_type == Arel::Nodes::OuterJoin
            table
          end.concat child.children.flat_map { |c| make_constraints(child, c, join_type) }
        end
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