lib/active_admin/dependency.rb in activeadmin-1.0.0.pre2 vs lib/active_admin/dependency.rb in activeadmin-1.0.0.pre3

@@ -1,9 +1,9 @@
 module ActiveAdmin
   module Dependency
     module Requirements
-      DEVISE = '~> 3.2'
+      DEVISE = '>= 3.2', '< 5'
     end
 
     # Provides a clean interface to check for gem dependencies at runtime.
     #
     # ActiveAdmin::Dependency.draper
@@ -53,10 +53,14 @@
 
     def self.[](name)
       Matcher.new name.to_s
     end
 
+    def self.rails5?
+      rails >= '5.x'
+    end
+
     class Matcher
       attr_reader :name
 
       def initialize(name)
         @name = name
@@ -88,8 +92,77 @@
 
       def inspect
         info = spec ? "#{spec.name} #{spec.version}" : '(missing)'
         "<ActiveAdmin::Dependency::Matcher for #{info}>"
       end
+
+      def adapter
+        @adapter ||= Adapter.const_get(@name.camelize).new self
+      end
+
+      def method_missing(method, *args, &block)
+        if respond_to_missing?(method)
+          adapter.send method, *args, &block
+        else
+          super
+        end
+      end
+
+      def respond_to_missing?(method, include_private = false)
+        adapter.respond_to?(method) || super
+      rescue NameError
+        # 🐾
+      end
     end
+
+    # Dependency adapters provide an easy way to wrap the conditional logic
+    # necessary to support multiple versions of a gem.
+    #
+    # ActiveAdmin::Dependency.rails.adapter.parameterize 'a b'
+    # => 'a_b'
+    #
+    # ActiveAdmin::Dependency.rails.parameterize 'a b'
+    # => 'a_b'
+    #
+    # ActiveAdmin::Dependency.devise.adapter
+    # -> NameError: uninitialized constant ActiveAdmin::Dependency::Adapter::Devise
+    #
+    module Adapter
+      class Base
+        def initialize(version)
+          @version = version
+        end
+      end
+
+      class Rails < Base
+        def strong_parameters?
+          @version >= 4 || defined?(ActionController::StrongParameters)
+        end
+
+        def parameterize(string)
+          if Dependency.rails5?
+            string.parameterize separator: '_'
+          else
+            string.parameterize '_'
+          end
+        end
+
+        def redirect_back(controller, fallback_location)
+          controller.instance_exec do
+            if Dependency.rails5?
+              redirect_back fallback_location: fallback_location
+            elsif controller.request.headers.key? 'HTTP_REFERER'
+              redirect_to :back
+            else
+              redirect_to fallback_location
+            end
+          end
+        end
+
+        def render_key
+          Dependency.rails5? ? :body : :text
+        end
+      end
+    end
+
   end
 end