1 files changed, 59 insertions, 0 deletions
diff --git a/activerecord/lib/arel/update_manager.rb b/activerecord/lib/arel/update_manager.rb
new file mode 100644
index 0000000000..fe444343ba
--- /dev/null
+++ b/activerecord/lib/arel/update_manager.rb
@@ -0,0 +1,59 @@
+# frozen_string_literal: true
+
+module Arel # :nodoc: all
+  class UpdateManager < Arel::TreeManager
+    def initialize
+      super
+      @ast = Nodes::UpdateStatement.new
+      @ctx = @ast
+    end
+
+    def take(limit)
+      @ast.limit = Nodes::Limit.new(Nodes.build_quoted(limit)) if limit
+      self
+    end
+
+    def key=(key)
+      @ast.key = Nodes.build_quoted(key)
+    end
+
+    def key
+      @ast.key
+    end
+
+    def order(*expr)
+      @ast.orders = expr
+      self
+    end
+
+    ###
+    # UPDATE +table+
+    def table(table)
+      @ast.relation = table
+      self
+    end
+
+    def wheres=(exprs)
+      @ast.wheres = exprs
+    end
+
+    def where(expr)
+      @ast.wheres << expr
+      self
+    end
+
+    def set(values)
+      if String === values
+        @ast.values = [values]
+      else
+        @ast.values = values.map { |column, value|
+          Nodes::Assignment.new(
+            Nodes::UnqualifiedColumn.new(column),
+            value
+          )
+        }
+      end
+      self
+    end
+  end
+end