Added lock to Arel, allowing a locking read if required.

1 files changed, 47 insertions, 0 deletions

diff --git a/spec/arel/engines/sql/unit/relations/lock_spec.rb b/spec/arel/engines/sql/unit/relations/lock_spec.rb
new file mode 100644
index 0000000000..27239eb1a8
--- /dev/null
+++ b/spec/arel/engines/sql/unit/relations/lock_spec.rb
@@ -0,0 +1,47 @@
+require 'spec_helper'
+
+module Arel
+  describe Lock do
+    before do
+      @relation = Table.new(:users)
+    end
+
+    describe '#to_sql' do
+      it "manufactures a simple select query lock" do
+        sql = @relation.lock.to_sql
+
+        adapter_is :mysql do
+          sql.should be_like(%Q{
+            SELECT `users`.`id`, `users`.`name`
+            FROM `users` FOR UPDATE
+          })
+        end
+
+        adapter_is_not :mysql do
+          sql.should be_like(%Q{
+            SELECT "users"."id", "users"."name"
+            FROM "users" FOR UPDATE
+          })
+        end
+      end
+
+      it "manufactures a select query locking with a given lock" do
+        sql = @relation.lock("LOCK IN SHARE MODE").to_sql
+
+        adapter_is :mysql do
+          sql.should be_like(%Q{
+            SELECT `users`.`id`, `users`.`name`
+            FROM `users` LOCK IN SHARE MODE
+          })
+        end
+
+        adapter_is_not :mysql do
+          sql.should be_like(%Q{
+            SELECT "users"."id", "users"."name"
+            FROM "users" LOCK IN SHARE MODE
+          })
+        end
+      end
+    end
+  end
+end