created CouchRest::Model mixin

lib/couchrest/core/model.rb

@@ -0,0 +1,73 @@
+module CouchRest
+  module Model
+    class << self
+      attr_accessor :default_database
+    end
+    
+    # instance methods on the model classes
+    module InstanceMethods
+      attr_accessor :doc
+      
+      def initialize doc = {}
+        self.doc = doc
+        unless doc['_id'] && doc['_rev']
+          init_doc
+        end
+      end
+      
+      def database
+        self.class.database
+      end
+      
+      def id
+        doc['_id']
+      end
+      
+      def rev
+        doc['_rev']
+      end
+      
+      def save
+        result = database.save doc
+        if result['ok']
+          doc['_id'] = result['id']
+          doc['_rev'] = result['rev']
+        end
+        result['ok']
+      end
+      
+      private
+      
+      def init_doc
+        doc['type'] = self.class.to_s
+      end
+    end # module InstanceMethods
+    
+    # these show up as class methods on models that include CouchRest::Model
+    module ClassMethods
+      def use_database db
+        @database = db
+      end
+      
+      def database
+        @database || CouchRest::Model.default_database
+      end
+      
+      def uniq_id method
+        before_create do |model|
+          model.doc['_id'] = model.send(method)
+        end
+      end
+    end # module ClassMethods
+    
+    # bookkeeping section
+    
+    # load the code into the model class
+    def self.included(klass)
+      klass.extend ClassMethods
+      klass.send(:include, InstanceMethods)
+    end
+    
+    
+  end # module Model
+end # module CouchRest