Ember: how to retrieve validation errors after becameInvalid state? - ember.js

Question

I use the RESTadpater to persist data. When a validation error occurs, I want to return a 422 response and then log the errors and show an indication next to each incorrect field.
My REST response status code is as follows:
Status Code:422 Unprocessable Entity
My REST response body is as follows:
{
"message": "Validation failed",
"errors": [
{
"name": "duplicate"
}
]
}
In my controller, the becameInvalid fires correctly.
App.AuthorsNewController = Ember.ObjectController.extend({
startEditing: function () {
//Create a new record on a local transaction
this.transaction = this.get('store').transaction();
this.set('model', this.transaction.createRecord(App.Author, {}));
},
save: function (author) {
//Local commit - author record goes in Flight state
author.get('transaction').commit();
//If response is success: didCreate fires
//Transition to edit of the new record
author.one('didCreate', this, function () {
this.transitionToRoute('author.edit', author);
});
//If response is 422 (validation problem at server side): becameError fires
author.one('becameInvalid', this, function () {
console.log "Validation problem"
});
}
...
2 QUESTIONS:
I want to log below the 'console.log "Validation problem"', the complete list of errors returned by the server. How can I do that ?
In my hbs template, I want to indicate an error next to the relevant field. How can I do this ?
I am not sure that the data returned via REST adapter is correct. So problem might be at the REST side or at the Ember side ...

Answer 1

Solution:
In controller save function:
author.one('becameInvalid', this, function () {
console.log "Validation problem"
this.set('errors', this.get('content.errors'));
});
In hbs template:
{{view Ember.TextField valueBinding='name'}}
{{#if errors.name}}{{errors.name}}{{/if}}

Answer 2

Here is how I do it, may not be the best practice but it works for me:
instead of using commit(), I use save(), and if you wonder what's the difference, here is the link. I haven't tried your approach of using transaction, but basically I create the record using record = App.Model.createRecord(...), and here is the code of my apiAddShop function inside the AddShopController:
apiAddShop: function() {
//console.log("add shop");
newShop = App.Shop.createRecord({name:this.get('name'), currentUserRole:"owner"});
//this.get('store').commit(); // Use record.save() instead, then() is not defined for commit()
var self = this;
newShop.save().then(function(response){
self.transitionToRoute('shops');
}, function(response){
// if there is error:
// server should respond with JSON that has a root "errors"
// and with status code: 422
// otherwise the response could not be parsed.
var errors = response.errors;
for(var attr in errors){
if (self.hasOwnProperty(attr)) {
self.set(attr+"Error", true);
self.set(attr+"Message", Ember.String.classify(attr)+" "+errors[attr]);
}
console.log(attr + ': ' + errors[attr]);
}
console.log(response.errors.name[0]);
});
},
the above code assume there is a attrError(boolean) and attrMessage(string) for each of the attributes in your form. Then in your template, you could bind the class of your field to these error attributes, such as <div {{bindAttr class=":control-group nameError:error:"}}>, and the error message could be easily display next to the form field such as: <span {{bindAttr class=":help-inline nameError::hidden"}} id="new_shop_error">{{nameMessage}}</span> Here is my example handlebar gist (have to use gist here, since SO is escaping my html inputs).