rails-api:render json multiple values

Question

I have a model

class Banner < ActiveRecord::Base
  validates :title, presence: true, length: { maximum: 50 }
  validates :description, length: { maximum: 200 }

  belongs_to :document

  def img_url
    document.medium_url
  end
end

and serializer

class BannerSerializer < ActiveModel::Serializer
  attributes :id, :title, :description, :img_url, :document_id
end

When I'm using render json: Banner.all, it response correctly (has "img_url" in the responding

{
"banners": [
    {
      "id": 1,
      "title": "This is title of banner",
      "description": "This is long description...",
      "img_url": "http://localhost:3000//system/documents/attachments/000/000/023/medium/one-piece.jpg?1459601536",
      "document_id": 23
    }
  ]
}

But when I want to return with other object by using. example:

render json: {
      banners: Banner.all,
      blogs: Blog.all,
      partners: Partner.all
    }

The responding don't exist "img_url" (it don't use Serializer).

Please help.

It don't include img_url too, beside that, the value of banners become to string — Quan Vo
– Quan Vo, Commented Apr 3, 2016 at 7:58
looking at docs and this link github.com/rails-api/active_model_serializers/issues/1204 something like this should work: ActiveModel::SerializableResource.new(Banner.all).serializable_hash — ArashM
– ArashM, Commented Apr 3, 2016 at 8:11

7urkm3n · Accepted Answer · 2018-01-30 08:00:34Z

2

Serializer has new method. That you can call it from controllers too.

render json: BlogSerializer.new(Blog.all)

For array, use ArraySerializer. Example:

blogs = ActiveModel::ArraySerializer.new(blogs, each_serializer: ArticleSerializer)

edited Jan 30, 2018 at 8:00

answered Apr 4, 2016 at 3:09

7urkm3n

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5 Comments

Quan Vo Over a year ago

I have test again, It worked on single value (example: BlogSerializer.new(Blog.all.frist), but list don't work :(. BTW: thanks

7urkm3n Over a year ago

probably, u have an issue somewhere. in my project it works.

Quan Vo Over a year ago

I have found a solution by using ArraySerializer :) ActiveModel::ArraySerializer.new(blogs, each_serializer: ArticleSerializer) using for array

Quan Vo Over a year ago

I have edited your comment, could you review that I can vote this anwer :)

Quan Vo Over a year ago

With your help :), Thanks

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