1 files changed, 44 insertions, 0 deletions
diff --git a/activerecord/lib/arel/factory_methods.rb b/activerecord/lib/arel/factory_methods.rb
new file mode 100644
index 0000000000..6647c5ac44
--- /dev/null
+++ b/activerecord/lib/arel/factory_methods.rb
@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+module Arel
+  ###
+  # Methods for creating various nodes
+  module FactoryMethods
+    def create_true
+      Arel::Nodes::True.new
+    end
+
+    def create_false
+      Arel::Nodes::False.new
+    end
+
+    def create_table_alias relation, name
+      Nodes::TableAlias.new(relation, name)
+    end
+
+    def create_join to, constraint = nil, klass = Nodes::InnerJoin
+      klass.new(to, constraint)
+    end
+
+    def create_string_join to
+      create_join to, nil, Nodes::StringJoin
+    end
+
+    def create_and clauses
+      Nodes::And.new clauses
+    end
+
+    def create_on expr
+      Nodes::On.new expr
+    end
+
+    def grouping expr
+      Nodes::Grouping.new expr
+    end
+
+    ###
+    # Create a LOWER() function
+    def lower column
+      Nodes::NamedFunction.new 'LOWER', [Nodes.build_quoted(column)]
+    end
+  end
+end