javascript - AngularJS text input with ng-model but needs default value not working with value= or ng-init= -

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I have an account form with many inputs. One of them below: 

  & Lt; Input class = "form-control" placeholder = "first name" type = "text" ng-model = "account.first_name" ng-init = "account.first_name = user.account.first_name" & gt;   
 I have a service in my controller that gives all the user information. I'm trying, in the input, show current information on the file.  
 I want it in an input so that they can change it.  
 However, when I set the  value = "{{user.account.first_name}}"  which returned from my service to my API and  $ scope. user sets equals , nothing shows input in it.  
 I searched for answers on SO and gave some suggestions which  ng-init , which still did not work.  
 I have also tried the  ng-bind ,  ng-value , and before that i  ng-model  Setting.  
 How do I do this?  
 Edit:  
 Here is my account administrator. Only service in  return $ http.get ('/ api / account');   
  app.controller ('AccountCtrl', function ($ radius, account) {account.show () .success (function (data) {$ scope.user = data; There is a JSON schema:  
  {"account": {}, "document":   
  data  {}}   
 But from inside the data.   
 
 
 After receiving the data from the service, do it in the administrator  
  account.show () .success (data) {$ scope.user = data; // set account.first_name here $ scope. Account = {first_name: $ scope.user.account.first_name}; // or you can use angular.copy (source, destination) They are angular.copy (data. Count, $ scope.account)});

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