How to create a serializer which return an array of hash without key?

Question

I need to create a structure like that using the active_model_serializers gem

{
  "categories": [
    {
      "code": "code",
      "name": "name"
    },
    {
      "code": "code",
      "name": "name"
    },
    {
      "code": "code",
      "name": "name"
    },
    {
      "code": "code",
      "name": "name"
    }
  ]
}

Categories refers to a PORO virtus:

module Api
  module Bitsky
    class MarketStructure
      include Virtus.model

      attribute :department_name, String
      attribute :department_code, Integer
      attribute :department_value, String
      attribute :sector_name, String
      attribute :sector_code, Integer
      attribute :sector_value, String
      attribute :family_name, String
      attribute :family_code, Integer
      attribute :family_value, String
      attribute :sub_family_name, String
      attribute :sub_family_code, Integer
      attribute :sub_family_value, String
    end
  end
end

I've code this serializer to try to create that hash. It worked, however the result was not what I expected.

module Api
  module Bitsky
    class MarketStructure< ActiveModel::Serializer
      attributes :categories

     def categories
       *** some operation ***
     end
    end
  end
end

Result

{
  "categories": {
    "categories": [
      {
        "code": "code",
        "name": "name"
      }
    ]
  }
}

How do I write a serializer which return only a Hash Array without this key "categories" ?

3limin4t0r · Accepted Answer · 2018-08-20 02:06:55Z

3

You should be doing something like this

@categories.as_json(root: false)

or

render json: @categories, root: false

edited Aug 20, 2018 at 2:06

3limin4t0r

21.4k3 gold badges38 silver badges61 bronze badges

answered Aug 19, 2018 at 15:16

Kedarnag Mukanahallipatna

2,3672 gold badges14 silver badges16 bronze badges

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