allow bulk updating of model

lib/model.rb

@@ -27,18 +27,24 @@ def key(symbol, &block)
     end
   end
 
-  def initialize(hash={})
-    unknown = hash.keys - keys
-    if unknown.count > 0
-      raise ArgumentError, "unknown keyword#{'s' if unknown.count > 1}: #{unknown.join', '}"
-    end
-    hash.each_pair {|key, v| instance_variable_set "@#{key}", v}
+  def initialize(hash=nil)
+    hash ||= {}
+    update(hash)
+
     (self.class.defaults.keys - hash.keys).each do |key|
       block = self.class.defaults[key]
       instance_variable_set("@#{key}", instance_exec(&block))
     end
   end
 
+  def update(hash)
+    unknown = hash.keys - keys
+    if unknown.count > 0
+      raise ArgumentError, "unknown keyword#{'s' if unknown.count > 1}: #{unknown.join', '}"
+    end
+    hash.each {|key, v| instance_variable_set "@#{key}", v}
+  end
+
   def keys
     self.class.keys
   end

spec/model_spec.rb

@@ -121,4 +121,12 @@ class OwnerModel < UserModel
     expect(user2).to_not eql user1
   end
 
+  it 'can update model values with a hash' do
+    address = AddressModel.new
+    address.update(street1: '1101 Fifth St',
+                   street2: 'Suite 300')
+    expect(address.street1).to eql '1101 Fifth St'
+    expect(address.street2).to eql 'Suite 300'
+  end
+
 end