Ruby Array to JSON and Rails JSON Rendering

Ruby array to JSON and Rails JSON rendering

def autocomplete
     @question = Question.all
     respond_to do |format|
       format.json { render :json => @question }
     end
end

Efficient way to convert collection to array of hashes for render json

1. Don't do it in the contoller
2. Don't generate the json response with map, let's as_json(*) method do that for you.
3. Don't use @ variable in the json render.
4. Don't use {}.to_json the render json: {} do it under the hood.

in the photo model.

def as_json(*)
  super(only: [:id], methods: [:label, :url, :size])
end
alias label name

def size
  uploaded_image_file_size
end    

def url
  uploaded_image.url(:small)
end

controller code.

def list
  render json: { results: current_user.photos }
end

How can I add custom value to json array in response in ruby?

You could try something like this:

render json: {"message": "somevalue", "response": response}

Simple as that, should do the trick.

By the way, you can also call the "response" field whatever you want. It's gonna be the key of the object you get in JSON later.

How Render json ruby on rails with array result

def render
  begin
     array= [:orange => 1,:limon => 3]
     render :json => {:array => array},:callback => params[:callback]
  rescue Exception => e
     puts e
  end
end

render custom json array in rails

This is a pretty naive way to render it, but this should get you started:

@hours = Hour.all
@users = User.where(id: @hours.map(&:user_id).uniq)
@hour_types = HourType.where(id: @hours.map(&:hour_type_id).uniq)

result = {
  users: @users.map{|u| {user_id: u.id} },
  hours: [] 
} 

@hour_types.each do |hour_type| 
  hour_type_hash = { 
    hour_type_id: hour_type.id, 
    hours: Hour.where(hour_type_id: hour_type.id).all.map{|h| {hour_id: h.id} } 
  }
  result[:hours] << hour_type_hash  
end 

render json: result_hash 

When rendering an object in JSON from the controller, how do I include a field from the object's parent?

Try this one

def show

  @my_object = MyObject.find(params[:id])
  render :json => @my_object.to_json(:include => [:parent => {:include => :address}]) 

end

You have added include within the include statement,

@my_object.to_json(:include => [:parent, **:include** => :address])

so rails is searching include as one of the method or model.

You can use a array like this for including more than one relationship.

:include => [:parent, :address]

Render the full Json array in response.body

Try this:

render json: @emergency.to_json(:root => "emergency"), :status => 201

Rails render index (JSON) after update returning empty array

You need to define @events in update action to render it as json

def update
  respond_to do |format|
    if @event.update(event_params)
      if ... 
       ....
      else
        @events = Event.all
        format.json { render :index, status: :ok }
      end
    else
      ....
    end
  end
end

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