Add support for custom validation contexts in resource creation and update

app/controllers/administrate/application_controller.rb

@@ -48,7 +48,7 @@ def create
       @resource = resource = new_resource(resource_params)
       authorize_resource(resource)
 
-      if resource.save
+      if resource.save(context: validation_contexts_on_create(resource))
         yield(resource) if block_given?
         redirect_to(
           after_resource_created_path(resource),
@@ -63,7 +63,9 @@ def create
 
     def update
       @resource = resource = requested_resource
-      if resource.update(resource_params)
+      resource.assign_attributes(resource_params)
+
+      if resource.save(context: validation_contexts_on_update(resource))
         redirect_to(
           after_resource_updated_path(resource),
           notice: translate_with_resource("update.success"),
@@ -277,6 +279,33 @@ def authorize_resource(resource)
       end
     end
 
+    # Override this if you want to contextualize the resource differently.
+    #
+    # @param resource A resource to be contextualized.
+    # @return nothing
+    def contextualize_resource(resource)
+    end
+
+    # Override this if you want to provide additional validation contexts.
+    #
+    # @param resource [ActiveRecord::Base] The resource to be validated.
+    # @return [Array<Symbol>] The validation contexts to be used.
+    def validation_contexts_on_create(resource)
+      default_validation_contexts(resource)
+    end
+
+    # Override this if you want to provide additional validation contexts.
+    #
+    # @param resource [ActiveRecord::Base] The resource to be validated.
+    # @return [Array<Symbol>] The validation contexts to be used.
+    def validation_contexts_on_update(resource)
+      default_validation_contexts(resource)
+    end
+
+    def default_validation_contexts(resource)
+      resource.new_record? ? [:create] : [:update]
+    end
+
     def paginate_resources(resources)
       resources.page(params[:_page]).per(records_per_page)
     end

docs/customizing_controller_actions.md

@@ -107,3 +107,30 @@ def create
   end
 end
 ```
+
+## Validation Contexts
+
+You can customize the context when saving a resource in the controller.  
+For example, with the following settings, regular admins are required to input a name, but super admins can update the resource *without* a name.
+
+```ruby
+# Model
+validates :name, presence: true, on: :save_by_regular_admin
+
+# Controller
+def validation_contexts_on_create(resource)
+  if current_user.super_admin?
+    super + [:save_by_super_admin]
+  else
+    super + [:save_by_regular_admin]
+  end
+end
+
+def validation_contexts_on_update(resource)
+  if current_user.super_admin?
+    super + [:save_by_super_admin]
+  else
+    super + [:save_by_regular_admin]
+  end
+end
+```

spec/controllers/admin/application_controller_spec.rb

@@ -100,4 +100,38 @@ def authorized_action?(resource, _action)
         .to raise_error(Administrate::NotAuthorizedError)
     end
   end
+
+  describe "validation contexts" do
+    render_views
+    controller(Admin::ProductsController) do
+      def validation_contexts_on_create(resource)
+        super + [:some_unclear_situation]
+      end
+
+      def validation_contexts_on_update(resource)
+        super + [:some_unclear_situation]
+      end
+    end
+
+    context "on create" do
+      it "raise a validation error due to custom validation context" do
+        params = attributes_for(:product)
+        post :create, params: {product: params}
+
+        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response.body).to include("Product meta tag can't be blank")
+      end
+    end
+
+    context "on update" do
+      it "raise a validation error due to custom validation context" do
+        product = create(:product, product_meta_tag: nil)
+        params = {name: "New Name"}
+        put :update, params: {id: product.to_param, product: params}
+
+        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response.body).to include("Product meta tag can't be blank")
+      end
+    end
+  end
 end