ruby-on-rails - Rails API 事件模型序列化器根节点不工作

Question

我有一个 rails 4.2.5 API 应用程序。出于某种原因，JSON 根节点未包含在响应中，我不明白为什么。

curl  http://localhost:3000/api/v1/category/science

返回

{"title":"science","sub_categories":34}%

代替

{"category": {"title":"science","sub_categories":34}%}

代码:

Controller

class Api::V1::CategoryController < ApplicationController
  def show
    category = params[:category] || "sports"
    @category = Category.where(cat_title: category.capitalize).first
    respond_to do |format|
      format.json { render json: @category, serializer: CategorySerializer, root: "category" }
    end
  end
end

序列化器

class CategorySerializer < ActiveModel::Serializer
  attributes :title, :sub_categories

  def title
    URI::encode(object.cat_title.force_encoding("ISO-8859-1").encode("utf-8", replace: nil).downcase.tr(" ", "_"))
  end

  def sub_categories
    object.cat_subcats
  end
end

Answer 1

查看您的初始化器，这应该在 wrap_paramters.rb 中注释掉:

# To enable root element in JSON for ActiveRecord objects.
# ActiveSupport.on_load(:active_record) do
#   self.include_root_in_json = true
# end