Make MyModel.all.to_yaml and MyModel.all.to_json work.

dm-serializer/lib/dm-serializer.rb

@@ -105,9 +105,20 @@ def to_xml_document(opts={})
       doc
     end
 
-  end # module Serialize
+  end # module Serialize
 
   module Resource
     include Serialize
   end # module Resource
+
+  class Collection
+    def to_yaml(opts = {})
+      to_a.to_yaml(opts)
+    end
+
+    def to_json
+      to_a.to_json
+    end
+  end
+
 end # module DataMapper

dm-serializer/spec/unit/serializer_spec.rb

@@ -1,4 +1,5 @@
 require 'pathname'
+require 'yaml'
 require Pathname(__FILE__).dirname.expand_path.parent + 'spec_helper'
 
 describe DataMapper::Serialize do
@@ -11,8 +12,14 @@ class Cow
       property :name, String
       property :breed, String
     end
-  end
 
+    properties = Cow.properties(:default)
+    properties_with_indexes = Hash[*properties.zip((0...properties.length).to_a).flatten]
+    @collection = DataMapper::Collection.new(DataMapper::repository(:default), Cow, properties_with_indexes)
+    @collection.load([1, 2, 'Betsy', 'Jersey'])
+    @collection.load([10, 20, 'Berta', 'Guernsey'])
+
+  end
 
   it "should serialize a resource to YAML" do
     betsy = Cow.new
@@ -29,6 +36,21 @@ class Cow
     EOS
   end
 
+  it "should serialize a collection to YAML" do
+    @collection.to_yaml.gsub(/[[:space:]]+\n/, "\n").strip.should == <<-EOS.margin
+      ---
+      - :id: 1
+        :composite: 2
+        :name: Betsy
+        :breed: Jersey
+      - :id: 10
+        :composite: 20
+        :name: Berta
+        :breed: Guernsey
+    EOS
+
+  end
+
   it "should serialize a resource to XML" do
     berta = Cow.new
     berta.id = 89
@@ -60,6 +82,13 @@ class Cow
     EOS
   end
 
+  it "should serialize a collection to JSON" do
+    @collection.to_json.gsub(/[[:space:]]+\n/, "\n").strip.should ==
+      '[{ "id": 1, "composite": 2, "name": "Betsy", "breed": "Jersey" },' +
+      '{ "id": 10, "composite": 20, "name": "Berta", "breed": "Guernsey" }]'
+  end
+
+
   it "should serialize a resource to CSV" do
     peter = Cow.new
     peter.id = 44