Merge branch '2-0-stable'

* 2-0-stable:
  making sure limit is correctly copied to update manager

lib/arel/crud.rb

@@ -12,7 +12,7 @@ def compile_update values
       end
       um.table relation
       um.set values
-      um.take @ast.limit
+      um.take @ast.limit.expr if @ast.limit
       um.order(*@ast.orders)
       um.wheres = @ctx.wheres
       um

lib/arel/update_manager.rb

@@ -7,7 +7,7 @@ def initialize engine
     end
 
     def take limit
-      @ast.limit = limit
+      @ast.limit = Nodes::Limit.new(limit) if limit
       self
     end
 

test/test_update_manager.rb

@@ -8,6 +8,15 @@ module Arel
       end
     end
 
+    it 'handles limit properly' do
+      table = Table.new(:users)
+      um = Arel::UpdateManager.new Table.engine
+      um.take 10
+      um.table table
+      um.set [[table[:name], nil]]
+      assert_match(/LIMIT 10/, um.to_sql)
+    end
+
     describe 'set' do
       it "updates with null" do
         table = Table.new(:users)