1 files changed, 49 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..83ec23e403
--- /dev/null
+++ b/activerecord/lib/arel/factory_methods.rb
@@ -0,0 +1,49 @@
+# frozen_string_literal: true
+
+module Arel # :nodoc: all
+  ###
+  # 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
+
+    def coalesce(*exprs)
+      Nodes::NamedFunction.new "COALESCE", exprs
+    end
+  end
+end