lib/cocina/models.rb in cocina-models-0.4.1 vs lib/cocina/models.rb in cocina-models-0.5.0

@@ -23,10 +23,27 @@
 loader.inflector = CocinaModelsInflector.new
 loader.push_dir(File.absolute_path("#{__FILE__}/../.."))
 loader.setup
 
 module Cocina
+  # Provides Ruby objects for the repository and serializing them to/from JSON.
   module Models
     class Error < StandardError; end
-    # Your code goes here...
+    # Raised when the type attribute is not valid.
+    class UnknownTypeError < Error; end
+
+    # @param [Hash] dyn a ruby hash representation of the JSON serialization of a collection or DRO
+    # @return [DRO,Collection]
+    # @raises [UnknownTypeError] if a valid type is not found in the data
+    # @raises [KeyError] if a type field cannot be found in the data
+    def self.build(dyn)
+      case dyn.fetch('type')
+      when *DRO::TYPES
+        DRO.from_dynamic(dyn)
+      when *Collection::TYPES
+        Collection.from_dynamic(dyn)
+      else
+        raise UnknownTypeError, "Unknown type: '#{dyn.fetch('type')}'"
+      end
+    end
   end
 end