Track changes to unsaved attributes

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@9127 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 80 insertions, 0 deletions

diff --git a/activerecord/test/cases/dirty_test.rb b/activerecord/test/cases/dirty_test.rb
new file mode 100644
index 0000000000..c6777f6bfd
--- /dev/null
+++ b/activerecord/test/cases/dirty_test.rb
@@ -0,0 +1,80 @@
+require 'cases/helper'
+
+# Stub out an AR-alike.
+class DirtyTestSubject
+  def self.table_name;  'people' end
+  def self.primary_key; 'id' end
+  def self.attribute_method_suffix(*suffixes) suffixes end
+
+  def initialize(attrs = {}) @attributes = attrs end
+
+  def save
+    changed_attributes.clear
+  end
+
+  alias_method :save!, :save
+
+  def name; read_attribute('name') end
+  def name=(value); write_attribute('name', value) end
+  def name_was; attribute_was('name') end
+  def name_change; attribute_change('name') end
+  def name_changed?; attribute_changed?('name') end
+
+  private
+    def define_read_methods; nil end
+
+    def read_attribute(attr)
+      @attributes[attr]
+    end
+
+    def write_attribute(attr, value)
+      @attributes[attr] = value
+    end
+end
+
+# Include the module after the class is all set up.
+DirtyTestSubject.module_eval { include ActiveRecord::Dirty }
+
+
+class DirtyTest < Test::Unit::TestCase
+  def test_attribute_changes
+    # New record - no changes.
+    person = DirtyTestSubject.new
+    assert !person.name_changed?
+    assert_nil person.name_change
+
+    # Change name.
+    person.name = 'a'
+    assert person.name_changed?
+    assert_nil person.name_was
+    assert_equal [nil, 'a'], person.name_change
+
+    # Saved - no changes.
+    person.save!
+    assert !person.name_changed?
+    assert_nil person.name_change
+
+    # Same value - no changes.
+    person.name = 'a'
+    assert !person.name_changed?
+    assert_nil person.name_change
+  end
+
+  def test_object_should_be_changed_if_any_attribute_is_changed
+    person = DirtyTestSubject.new
+    assert !person.changed?
+    assert_equal [], person.changed
+    assert_equal Hash.new, person.changes
+
+    person.name = 'a'
+    assert person.changed?
+    assert_nil person.name_was
+    assert_equal %w(name), person.changed
+    assert_equal({'name' => [nil, 'a']}, person.changes)
+
+    person.save
+    assert !person.changed?
+    assert_equal [], person.changed
+    assert_equal({}, person.changes)
+  end
+end