Added save! which raises ResourceInvalid unless valid?

Similar to Active Record - it will raise ActiveResouce::ResourceInvalid if
the resource is not valid (ie if <tt>valid?</tt> returns false)

However - does not raise ActiveResource::ResourceNotFound if the callbacks
fail (callbacks have not yet been implemented) - it will just try to save
and raise if the callbacks all fail.

This is not ideal behaviour - but will do until we decide to change the
behaviour of save_with_validations to actually raise (rather than catch) the
ResourceInvalid exception.
Signed-off-by: NJoshua Peek <josh@joshpeek.com>

activeresource/lib/active_resource/base.rb

@@ -893,6 +893,23 @@ def dup
     def save
       new? ? create : update
     end
+    
+    # Saves the resource.
+    #
+    # If the resource is new, it is created via +POST+, otherwise the
+    # existing resource is updated via +PUT+.
+    #
+    # With <tt>save!</tt> validations always run. If any of them fail
+    # ActiveResource::ResourceInvalid gets raised, and nothing is POSTed to
+    # the remote system.
+    # See ActiveResource::Validations for more information. 
+    #
+    # There's a series of callbacks associated with <tt>save!</tt>. If any
+    # of the <tt>before_*</tt> callbacks return +false+ the action is
+    # cancelled and <tt>save!</tt> raises ActiveResource::ResourceInvalid.
+    def save!
+      save || raise(ResourceInvalid.new(self))
+    end
 
     # Deletes the resource from the remote service.
     #

activeresource/test/cases/base_test.rb

@@ -654,7 +654,13 @@ def test_custom_header
 
   def test_save
     rick = Person.new
-    assert_equal true, rick.save
+    assert rick.save
+    assert_equal '5', rick.id
+  end
+
+  def test_save!
+    rick = Person.new
+    assert rick.save!
     assert_equal '5', rick.id
   end
 

activeresource/test/cases/validations_test.rb

@@ -23,9 +23,15 @@ def test_validates_presence_of
 
     assert p.save, "should have saved after fixing the validation, but had: #{p.errors.inspect}"
   end
+  
+  def test_fails_save!
+    p = new_project(:name => nil)
+    assert_raise(ActiveResource::ResourceInvalid) { p.save! }
+  end
+
 
   def test_validate_callback
-    # we have a callback ensuring the description is longer thn three letters
+    # we have a callback ensuring the description is longer than three letters
     p = new_project(:description => 'a')
     assert !p.valid?, "should not be a valid record when it fails a validation callback"
     assert !p.save, "should not have saved an invalid record"