Use error message from the server when reshare failed

app/assets/javascripts/app/models/post/interactions.js

@@ -123,8 +123,8 @@ app.models.Post.Interactions = Backbone.Model.extend({
         interactions.set({"reshares_count": interactions.get("reshares_count") + 1});
         interactions.reshares.trigger("change");
       })
-      .fail(function(){
-        app.flashMessages.error(Diaspora.I18n.t("reshares.duplicate"));
+      .fail(function(response) {
+        app.flashMessages.handleAjaxError(response);
       });
 
     app.instrument("track", "Reshare");

app/assets/javascripts/mobile/mobile_post_actions.js

@@ -98,8 +98,12 @@
           success: function() {
             Diaspora.Mobile.PostActions.toggleActive(link);
           },
-          error: function() {
-            alert(Diaspora.I18n.t("failed_to_reshare"));
+          error: function(response) {
+            if (response.status === 0) {
+              alert(Diaspora.I18n.t("errors.connection"));
+            } else {
+              alert(response.responseText);
+            }
           },
           complete: function() {
             Diaspora.Mobile.PostActions.hideLoader(link);

app/controllers/reshares_controller.rb

@@ -14,7 +14,7 @@ class ResharesController < ApplicationController
       current_user.dispatch_post(@reshare)
       render :json => ExtremePostPresenter.new(@reshare, current_user), :status => 201
     else
-      render :nothing => true, :status => 422
+      render text: I18n.t("javascripts.failed_to_reshare"), status: 422
     end
   end
 

config/locales/javascript/javascript.en.yml

@@ -199,7 +199,6 @@ en:
       hide: "Hide comments"
       no_comments: "There are no comments yet."
     reshares:
-      duplicate: "That good, eh?  You’ve already reshared that post!"
       successful: "The post was successfully reshared!"
       post: "Reshare <%= name %>’s post?"
     aspect_navigation:

spec/controllers/reshares_controller_spec.rb

@@ -46,7 +46,7 @@ describe ResharesController, :type => :controller do
         it 'doesn\'t allow the user to reshare the post again' do
           post_request!
           expect(response.code).to eq('422')
-          expect(response.body.strip).to be_empty
+          expect(response.body).to eq(I18n.t("javascripts.failed_to_reshare"))
         end
       end
 

spec/javascripts/app/models/post/interacations_spec.js

@@ -6,6 +6,8 @@ describe("app.models.Post.Interactions", function(){
     this.interactions = this.post.interactions;
     this.author = factory.author({guid: "loggedInAsARockstar"});
     loginAs({guid: "loggedInAsARockstar"});
+    spec.content().append($("<div id='flash-container'>"));
+    app.flashMessages = new app.views.FlashMessages({el: spec.content().find("#flash-container")});
 
     this.userLike = new app.models.Like({author : this.author});
   });
@@ -110,6 +112,16 @@ describe("app.models.Post.Interactions", function(){
       jasmine.Ajax.requests.mostRecent().respondWith(ajaxSuccess);
       expect(this.post.get("participation")).toBeTruthy();
     });
+
+    it("displays a flash message on errors", function() {
+      spyOn(app.flashMessages, "handleAjaxError").and.callThrough();
+      this.interactions.reshare();
+      jasmine.Ajax.requests.mostRecent().respondWith({status: 400, responseText: "error message"});
+
+      expect(app.flashMessages.handleAjaxError).toHaveBeenCalled();
+      expect(app.flashMessages.handleAjaxError.calls.argsFor(0)[0].responseText).toBe("error message");
+      expect(spec.content().find(".flash-message")).toBeErrorFlashMessage("error message");
+    });
   });
 
   describe("userLike", function(){

spec/javascripts/mobile/mobile_post_actions_spec.js

@@ -223,10 +223,16 @@ describe("Diaspora.Mobile.PostActions", function(){
       expect(Diaspora.Mobile.PostActions.toggleActive).toHaveBeenCalledWith(this.reshareLink);
     });
 
-    it("pops an alert on error", function(){
+    it("pops an alert on server errors", function() {
       this.reshareLink.click();
-      jasmine.Ajax.requests.mostRecent().respondWith({status: 400});
-      expect(window.alert).toHaveBeenCalledWith(Diaspora.I18n.t("failed_to_reshare"));
+      jasmine.Ajax.requests.mostRecent().respondWith({status: 400, responseText: "reshare failed"});
+      expect(window.alert).toHaveBeenCalledWith("reshare failed");
+    });
+
+    it("pops an alert on network errors", function() {
+      this.reshareLink.click();
+      jasmine.Ajax.requests.mostRecent().abort();
+      expect(window.alert).toHaveBeenCalledWith(Diaspora.I18n.t("errors.connection"));
     });
   });
 });