How to get json responses on form submissions via ruby on rails

Question

Just working on Ruby on Rails for the first time.

In my controller, am saving new users informations as follows and everything works fine via code below

 # POST /users
  def create
    @user = User.new(user_params)

    if @user.save
      session[:user_id] = @user.id   
      redirect_to @user, notice: 'User was successfully created.'
    else
      render :new
    end
  end

Now I need to get messages responses via json when form is submitted so that I can access it from my frontend. To this effect, I have added code below but it shows error

ActionController::UnknownFormat

I have reference solution found here but cannot get it to work

link

  # POST /users
  def create
    @user = User.new(user_params)

    respond_to do |format|
      if @user.save
        session[:user_id] = @user.id   
        format.json { render json: @user, message: 'User was successfully created.' }  
      else
        #render :new

        format.json { render json: @user, message: 'User cannot be created.' }    
      end
    end 
  end

I'm guessing you are not sending the request for the correct format. You can verify this by looking at the logs which should say something like `Processing by UsersController#create as HTML`.You either need to send the request to `/users.json` or send a `content-type=application/json` header. — max, Apr 12 '19 at 22:53
Sir format.html is working but format.json is what that is causing the error. Please is there any place i need some configurations. between thanks — Nancy Moore, Apr 13 '19 at 00:55
How are you sending the request? Please edit your question with a https://stackoverflow.com/help/mcve — max, Apr 13 '19 at 13:13

score 0 · Answer 1 · answered Apr 13 '19 at 20:14

0

Resolved by adding this to your routes config

resources :entries, defaults: { format: 'json' }

stackoverflow source

answered Apr 13 '19 at 20:14

Nancy Moore

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score 0 · Accepted Answer · answered Apr 13 '19 at 20:58

In your case, no need to write it down like this. Or use respond_to

Simply write it down if you are using rails 5:

# POST /users
def create
    @user = User.new(user_params)

    if @user.save
       session[:user_id] = @user.id   
       render json: @user, message: 'User was successfully created.' 
     else
       #render :new

       render json: @user, message: 'User cannot be created.' 
  end
end

And Mention in routes.rb file

resources :tasks, defaults: {format: :json}

If you are also defining namespace in routes.rb file then

namespace :api, defaults: {format: :json} do
   resources :tasks1
   resources :tasks2
   .............
end

How to get json responses on form submissions via ruby on rails

2 Answers2