module LeftJoin::Adapters::ActiveRecordAdapter
Public Instance Methods
left_join(*columns)
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Does a left join through an association. Usage:
Book.left_join(:category) # SELECT "books".* FROM "books" # LEFT OUTER JOIN "categories" # ON "books"."category_id" = "categories"."id"
It also works through association's associations, like `joins` does:
Book.left_join(category: :master_category)
# File lib/left_join/adapters/active_record_adapter.rb, line 14 def left_join(*columns) join_dependency = ActiveRecord::Associations::JoinDependency.new(self, columns, []) if RAILS4_1_PLUS joins(join_dependency) else join_dependency.join_associations.inject(self) do |result, association| association.join_relation(result) end end end
Also aliased as: left_joins