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Active_model_serializers not working in rails-api

I searched a lot and didn't find a solution.

I have a rails-api app and a simple model, controller and serializer

but when i try to get the index route i get standard json rails not serialized.

class Tag < ActiveRecord::Base
end

class TagSerializer < ActiveModel::Serializer
  attributes :id, :title
end

class TagsController < ApplicationController
  def index
    render json: Tag.all
  end
end

I get:

[
  tag: {
    id: 1,
    title: 'kifla'
  },
  tag: 
 .....

I want to:

[
  { id: 1, title: 'kifla'},
  { .....
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4 answers


It looks like you are trying to disable the root element of your json output.

How this is achieved may depend on which version active_model_serializers

you are using.

As 0.9.x

you can do something like this in Rails initializer:

# Disable for all serializers (except ArraySerializer)
ActiveModel::Serializer.root = false

# Disable for ArraySerializer
ActiveModel::ArraySerializer.root = false

Or, simply, in your controller action:

class TagsController < ApplicationController
  def index
    render json: Tag.all, root: false
  end
end


For more information, see the links to the relevant sections in the latest README pages.

https://github.com/rails-api/active_model_serializers/tree/0-9-stable#disabling-the-root-element

https://github.com/rails-api/active_model_serializers/tree/0-8-stable#disabling-the-root-element

-

Please note, make sure you are actually including the code that handles serialization, as ActionController :: API is not used by default. For example,

class ApplicationController < ActionController::API
  include ActionController::Serialization
end
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This is because serialization is not loaded into rails-api by default. You must do this:



class ApplicationController < ActionController::API
  include ::ActionController::Serialization
end
+31


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I had the same problem using the most recent rails-api 4.2.0beta p>

Serializers didn't pick up. I downgraded rails-api to 4.1.5 and it worked. Remember to delete

config.active_record.raise_in_transactional_callbacks = true

from config / application.rb this will throw an error in versions before 4.2.0

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If you are using the latest version, it seems that you cannot set the default adapter anymore according to this:

https://github.com/rails-api/active_model_serializers/issues/1683

The workaround is to use

    render json: object_to_render, adapter: :json

Also, there is no need to add this anymore:

    include ::ActionController::Serialization

It's frustrating how the Rails api keeps changing version to version without detailed documentation.

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