将模型方法的返回哈希转换为可序列化哈希（用于as_json）。

huangapple
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英文:

Convert a returning Hash of a Model's method to a serializable_hash (for as_json)

问题

你可以尝试在Controller中使用 as_json 方法，并结合 :only 和 :except 来过滤 child_data 方法返回的哈希数据，如下所示：

  1. class Api::V5::Private::FamilyController < Api::V5::PrivateController
  3.   def index
  4.     families = Family.all.map do |family|
  5.       {
  6.         id: family.id,
  7.         last_name: family.last_name,
  8.         child_data: family.child_data.slice(:first_name, :gender)
  9.       }
  10.     end
  12.     render json: families
  13.   end
  15. end
英文:

My Modelclass has a method, that returns some calculated data in form of a Hash. In the Controller I want to use this data, but want to include only some parts of the Hash.

My first idea was, to use the method inside :include in the to_json-options instead of the :methods field. But this will end in an undefined method 'serializable_hash'-Error.

Model:

  1. class Family < ActiveRecord::Base
  3.   def child_data
  4.     {
  5.       gender: self.child_gender,
  6.       first_name: self.child_first_name,
  7.       last_name: self.child_last_name,
  8.       email: self.child_email,
  9.       phone: self.child_phone
  10.     }
  11.   end
  13. end

Controller:

  1. class Api::V5::Private::FamilyController < Api::V5::PrivateController
  3.   def index
  5.     render json: Family.all.to_json({
  6.       only: [ :id, :last_name ],
  7.       # methods: [ :child_data ], <-- WOULD WORK
  8.       include: {
  9.         child_data: {
  10.           only: [ :first_name, :gender ]
  11.         }
  12.       }
  13.     })
  15.   end
  17. end

How can I use the returning Hash of the method "child_data" inside to_json/as_json, but use :only and :except to filter the Hash?

答案1

得分: 0

以下是已翻译的部分：

  1. 使用一个具有方法 "serializable_hash" 的模块，并扩展哈希对象以使用该模块：
  1. module Serializable
  2.   
  3.   def serializable_hash opts
  4.     self.as_json(opts)
  5.   end
  6.   
  7. end

和

  1. def child_data
  2.    {
  3.       gender: self.child_gender,
  4.       first_name: self.child_first_name,
  5.       last_name: self.child_last_name,
  6.       email: self.child_email,
  7.       phone: self.child_phone
  9.    }.extend(Serializable)
  10. end
  1. 在 "initializers/" 中重新打开 Ruby 的哈希类并添加方法：

config/initializers/hash_extensions.rb

  1. class Hash
  2.   def serializable_hash opts
  3.     self.as_json(opts)
  4.   end
  5. end

我将只返回翻译好的部分，不提供额外的内容。

英文:

Found two solutions for this:

  1. Use a module with method "serializable_hash" and extend the Hash with this module:
  1. module Serializable
  2.   
  3.   def serializable_hash opts
  4.     self.as_json(opts)
  5.   end
  6.   
  7. end

and

  1. def child_data
  2.    {
  3.       gender: self.child_gender,
  4.       first_name: self.child_first_name,
  5.       last_name: self.child_last_name,
  6.       email: self.child_email,
  7.       phone: self.child_phone
  9.    }.extend(Serializable)
  10. end
  1. Extend Ruby's Hash Class inside the "initializers/" by reopening the Class and add the method:

config/initializers/hash_extensions.rb

  1. class Hash
  2.   def serializable_hash opts
  3.     self.as_json(opts)
  4.   end
  5. end

I'll leave this here for anybody, who also got into this problem.

huangapple
  • 本文由 发表于 2023年6月27日 18:48:07
  • 转载请务必保留本文链接：https://go.coder-hub.com/76564092.html
  • ruby
  • ruby-on-rails
  • ruby-on-rails-6
  • serialization
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