Adding property build support to enable CastedArray#build

history.md

@@ -2,9 +2,12 @@
 
 ## 1.1.0 - 2011-05-XX
 
+* New Features
+  * Properties with a nil value are now no longer sent to the database.
+  * Now possible to build new objects via CastedArray#build
+
 * Minor fixes
   * #as_json now correctly uses ActiveSupports methods.
-  * nil properties are now no longer sent in the document body.
   * Rails 3.1 support (Peter Williams)
   * Initialization blocks when creating new models (Peter Williams)
   * Removed railties dependency (DAddYE)

lib/couchrest/model/casted_array.rb

@@ -50,6 +50,12 @@ module CouchRest::Model
       super
     end
 
+    def build(*args)
+      obj = casted_by_property.build(*args)
+      self.push(obj)
+      obj
+    end
+
     protected
 
     def instantiate_and_cast(obj, change = true)

lib/couchrest/model/property.rb

@@ -64,6 +64,18 @@ module CouchRest::Model
       end
     end
 
+    # Initialize a new instance of a property's type ready to be
+    # used. If a proc is defined for the init method, it will be used instead of 
+    # a normal call to the class.
+    def build(*args)
+      raise StandardError, "Cannot build property without a class" if @type_class.nil?
+      if @init_method.is_a?(Proc)
+        @init_method.call(*args)
+      else
+        @type_class.send(@init_method, *args)
+      end
+    end
+
     private
 
       def associate_casted_value_to_parent(parent, value)

lib/couchrest/model/typecast.rb

@@ -14,8 +14,7 @@ module CouchRest
         elsif [String, TrueClass, Integer, Float, BigDecimal, DateTime, Time, Date, Class].include?(klass)
           send('typecast_to_'+klass.to_s.downcase, value)
         else
-          # Allow the init_method to be defined as a Proc for advanced conversion
-          property.init_method.is_a?(Proc) ? property.init_method.call(value) : klass.send(property.init_method, value)
+          property.build(value)
         end
       end
 

spec/couchrest/property_spec.rb

@@ -358,6 +358,28 @@ describe "Property Class" do
     property.init_method.should eql('parse')
   end
 
+  describe "#build" do
+    it "should allow instantiation of new object" do
+      property = CouchRest::Model::Property.new(:test, Date)
+      obj = property.build(2011, 05, 21)
+      obj.should eql(Date.new(2011, 05, 21))
+    end
+    it "should use init_method if provided" do
+      property = CouchRest::Model::Property.new(:test, Date, :init_method => 'parse')
+      obj = property.build("2011-05-21")
+      obj.should eql(Date.new(2011, 05, 21))
+    end
+    it "should use init_method Proc if provided" do
+      property = CouchRest::Model::Property.new(:test, Date, :init_method => Proc.new{|v| Date.parse(v)})
+      obj = property.build("2011-05-21")
+      obj.should eql(Date.new(2011, 05, 21))
+    end
+    it "should raise error if no class" do
+      property = CouchRest::Model::Property.new(:test)
+      lambda { property.build }.should raise_error(StandardError, /Cannot build/)
+    end
+  end
+
   ## Property Casting method. More thoroughly tested in typecast_spec.
 
   describe "casting" do
@@ -386,6 +408,18 @@ describe "Property Class" do
       property.cast(parent, ["2010-06-01", "2010-06-02"]).class.should eql(CouchRest::Model::CastedArray)
     end
 
+    it "should allow instantion of model via CastedArray#build" do
+      property = CouchRest::Model::Property.new(:dates, [Date])
+      parent = Article.new
+      ary = property.cast(parent, [])
+      obj = ary.build(2011, 05, 21)
+      ary.length.should eql(1)
+      ary.first.should eql(Date.new(2011, 05, 21))
+      obj = ary.build(2011, 05, 22)
+      ary.length.should eql(2)
+      ary.last.should eql(Date.new(2011, 05, 22))
+    end
+
     it "should raise and error if value is array when type is not" do
       property = CouchRest::Model::Property.new(:test, Date)
       parent = mock("FooClass")