Allow Property lazy context to be a Symbol or Array of Symbols

[#962 state:resolved]

lib/dm-core/property.rb

@@ -899,11 +899,16 @@ def assert_valid_options(options)
               raise ArgumentError, "options[#{key.inspect}] must not be nil"
             end
 
-          when :serial, :key, :nullable, :unique, :lazy, :auto_validation
+          when :serial, :key, :nullable, :unique, :auto_validation
             unless value == true || value == false
               raise ArgumentError, "options[#{key.inspect}] must be either true or false"
             end
 
+          when :lazy
+            unless value == true || value == false || value.kind_of?(Symbol) || (value.kind_of?(Array) && value.all? { |val| val.kind_of?(Symbol) })
+              raise ArgumentError, "options[#{key.inspect}] must be either true, false, a Symbol or an Array of Symbols"
+            end
+
           when :index, :unique_index
             assert_kind_of "options[#{key.inspect}]", value, Symbol, Array, TrueClass
 

spec/public/property_spec.rb

@@ -20,7 +20,7 @@ class ::Image
 
       property :md5hash,      String, :key => true, :length => 32
       property :title,        String, :nullable => false, :unique => true
-      property :description,  Text,   :length => 1..1024, :lazy => true
+      property :description,  Text,   :length => 1..1024, :lazy => [ :detail ]
 
       property :format,       String, :default => 'jpeg'
       # WxH, stored as a dumped Ruby pair