Removing ActiveFedora as a dependency

hydra-editor.gemspec

@@ -16,7 +16,6 @@ Gem::Specification.new do |s|
   s.files = Dir["{app,config,db,lib}/**/*"] + ["Rakefile", "README.md", "History.md"]
 
   s.add_dependency "activerecord", "~> 5.0"
-  s.add_dependency "active-fedora", ">= 9.0.0"
   s.add_dependency "almond-rails", '~> 0.1'
   s.add_dependency "cancancan", "~> 1.8"
   s.add_dependency "rails", ">= 5", "< 6"

lib/hydra_editor/controller_resource.rb

@@ -1,6 +1,8 @@
+require 'pry-byebug'
+
 class HydraEditor::ControllerResource < CanCan::ControllerResource
   def find_resource
-    ActiveFedora::Base.find(id_param)
+    query_service.find_by(id: id_param)
   end
 
   def resource_class
@@ -15,4 +17,55 @@ def has_valid_type?
   def type_param
     @params[:type]
   end
+
+  private
+
+    class QueryServiceAdapter
+      def self.adapter_class(orm_class)
+        module_namespace = "HydraEditor::ControllerResource"
+        adapter_name = "#{module_namespace}::#{orm_class.name.split("::").first}QueryAdapter"
+        adapter_name.constantize
+      end
+
+      def self.registered?(orm_class)
+        adapter_class(orm_class)
+        true
+      rescue NameError
+        false
+      end
+
+      def self.build(orm_class)
+        if registered?(orm_class)
+          adapter_class(orm_class).new(orm_class: orm_class)
+        else
+          self.new(orm_class: orm_class)
+        end
+      end
+
+      def initialize(orm_class:)
+        @orm_class = orm_class
+      end
+
+      def find_by(id:)
+        @orm_class.find_by(id: id)
+      end
+    end
+
+    class ActiveFedoraQueryAdapter < QueryServiceAdapter
+      def find_by(id:)
+        @orm_class.find(id)
+      end
+    end
+
+    def orm_class_name
+      'ActiveFedora::Base'
+    end
+
+    def orm_class
+      orm_class_name.constantize
+    end
+
+    def query_service
+      @query_service ||= QueryServiceAdapter.build(orm_class)
+    end
 end