Handle json requests in error handler

app/controllers/alchemy/admin/base_controller.rb

@@ -54,7 +54,10 @@ def show_error_notice(error)
         if request.xhr?
           render action: "error_notice"
         else
-          render "500", status: 500
+          respond_to do |format|
+            format.html { render "500", status: 500 }
+            format.json { render json: { message: @notice }, status: 500 }
+          end
         end
       end
 

app/controllers/alchemy/api/elements_controller.rb

@@ -23,7 +23,7 @@ def index
       if params[:named].present?
         @elements = @elements.named(params[:named])
       end
-      @elements = @elements.includes(*element_includes)
+      @elements = @elements.includes(*element_includes).order(:position)
 
       render json: @elements, adapter: :json, root: "elements"
     end

spec/controllers/alchemy/admin/base_controller_spec.rb

@@ -32,7 +32,7 @@
       before do
         allow(I18n).to receive(:default_locale) { :es }
         allow(I18n).to receive(:available_locales) { [:es] }
-        allow(controller).to receive(:session) { { alchemy_locale: "kl"} }
+        allow(controller).to receive(:session) { { alchemy_locale: "kl" } }
       end
 
       it "sets I18n.locale to the default locale" do
@@ -60,7 +60,7 @@
   context "when current_alchemy_user is present" do
     let!(:page_1) { create(:alchemy_page, name: "Page 1") }
     let!(:page_2) { create(:alchemy_page, name: "Page 2") }
-    let(:user)    { create(:alchemy_dummy_user, :as_admin) }
+    let(:user) { create(:alchemy_dummy_user, :as_admin) }
 
     context "and she has locked pages" do
       before do
@@ -76,4 +76,33 @@
       end
     end
   end
+
+  describe "error responses" do
+    controller do
+      def index
+        raise "Error!"
+      end
+    end
+
+    before do
+      allow_any_instance_of(described_class).to receive(:raise_exception?) { false }
+    end
+
+    context "for HTML requests" do
+      it "renders 500 template" do
+        get :index
+        expect(response).to render_template("alchemy/base/500")
+      end
+    end
+
+    context "for JSON requests" do
+      render_views
+
+      it "renders 500 template" do
+        get :index, format: :json
+        expect(response.media_type).to eq("application/json")
+        expect(JSON.parse(response.body)).to eq({ "message" => "Error!" })
+      end
+    end
+  end
 end