更改作为参数接收的嵌套键的名称 [英] change the name of nested keys received as parameter

问题描述

rails 中的嵌套参数通过附加到键的属性进行传递，然后将其传递给 permit

Hi in rails the nested parameters are passed with attributes appended to the key's and then its is passed to permit

如果我收到正常的哈希值并想在调用 permit 之前将属性附加到每个嵌套键

If I receive normal hash and want to append attribute to each nested key before permit is called

怎么做?

"project":{  
  "project_name":"test",
  "tentative_start_date":"2018-12-12",
  "tentative_end_date":"2019-12-12",
"project_roles":[  
     {  
        "role_id":1,
        "project_role_skills":[  
           {  
              "skill":{  
                 "skill_type":"C++",
                 "id":2
              }
           }
        ],
        "project_role_users":[  

        ],
        "role_end_date":"2018-12-12",
        "role_start_date":"2018-12-12"
     }
  ]

}}

这是我收到的请求，我想将属性附加到 project_roles、project_role_skill 等，以便 rails 接受该请求

This is the request I received and I want to append attribute to project_roles,project_role_skill and so on so that rails accept that

请大家帮忙

推荐答案

TL;DR:

def params_with_deep_appended_nested_attributes(_params)
  modified_params = _params.clone

  _params.each do |k, v|
    if v.is_a?(Array)
      modified_params["#{k}_attributes"] = []

      v.each_with_index do |vv, index|
        if vv.is_a?(ActionController::Parameters)
          modified_params["#{k}_attributes"][index] = params_with_deep_appended_nested_attributes(vv)
        end
      end

      modified_params.delete(k)

    elsif v.is_a?(ActionController::Parameters)
      modified_params["#{k}_attributes"] = params_with_deep_appended_nested_attributes(v)
      modified_params.delete(k)
    end
  end

  modified_params
end

用法示例:

# rails console
example_json_hash_request = {
  "project": {
    "project_name":"test",
    "tentative_start_date":"2018-12-12",
    "tentative_end_date":"2019-12-12",
    "project_roles": [
       {  
          "role_id":1,
          "project_role_skills":[  
             {  
                "skill":{  
                   "skill_type":"C++",
                   "id":2
                }
             }
          ],
          "project_role_users":[  

          ],
          "role_end_date":"2018-12-12",
          "role_start_date":"2018-12-12"
       }
    ]
  }
}

# simulate `params` value in the controller
params = ActionController::Parameters.new(example_json_hash_request)

modified_params = params_with_deep_appended_nested_attributes(params)

pp modified_params.permit!.to_hash
# {"project_attributes"=>
#   {"project_name"=>"test",
#    "tentative_start_date"=>"2018-12-12",
#    "tentative_end_date"=>"2019-12-12",
#    "project_roles_attributes"=>
#     [{"role_id"=>1,
#       "role_end_date"=>"2018-12-12",
#       "role_start_date"=>"2018-12-12",
#       "project_role_skills_attributes"=>
#        [{"skill_attributes"=>{"skill_type"=>"C++", "id"=>2}}],
#       "project_role_users_attributes"=>[]}]}}

解决方案:

# app/controllers/application_controller.rb
class ApplicationController < ActionController::Base
  # ...
  # I added `= params` to default to the `params` value here in the controller
  def params_with_deep_appended_nested_attributes(_params = params)
    modified_params = _params.clone

    _params.each do |k, v|
      if v.is_a?(Array)
        modified_params["#{k}_attributes"] = []

        v.each_with_index do |vv, index|
          if vv.is_a?(ActionController::Parameters)
            modified_params["#{k}_attributes"][index] = params_with_deep_appended_nested_attributes(vv)
          end
        end

        modified_params.delete(k)

      elsif v.is_a?(ActionController::Parameters)
        modified_params["#{k}_attributes"] = params_with_deep_appended_nested_attributes(v)
        modified_params.delete(k)
      end
    end

    modified_params
  end
  # ...
end

# app/controllers/projects_controller.rb
class ProjectsController < ApplicationController
  def create
    @project = Project.new(project_params)

    if @project.save
      # ...
    else
      # ...
    end
  end

  def project_params
    params_with_deep_appended_nested_attributes.require(:project_attributes).permit(
      :project_name, :tentative_start_date, :tentative_end_date,
      project_roles_attributes: [
        :role_id, :role_end_date, :role_start_date,
        project_role_skills_attributes: [
          skill_attributes: [
            :skill_type, :id
          ]
        ],
        project_role_users_attributes: []
      ]
    )
  end
end

不要忘记在模型中定义嵌套属性":

Don't forget to define the "nested attributes" in the models:

# app/models/project.rb
class Project < ApplicationRecord
  has_many :project_roles
  accepts_nested_attributes_for :project_roles
end

# app/models/project_role.rb
class ProjectRole < ApplicationRecord
  belongs_to :project
  has_many :project_role_skills
  has_many :project_role_users
  accepts_nested_attributes_for :project_role_skills
  accepts_nested_attributes_for :project_role_users
end

# app/models/project_role_skill.rb
class ProjectRoleSkill < ApplicationRecord
  belongs_to :project_role
  belongs_to :skill
  accepts_nested_attributes_for :skill
end

待办事项:

• 添加缓存 params_with_deep_appended_nested_attributes 返回值，以避免每次调用 params_with_deep_appended_nested_attributes 时都运行代码.

TODOs:

• add cahing of the params_with_deep_appended_nested_attributes return value, to avoid running the code each time params_with_deep_appended_nested_attributes is going to be called.

这个问题我很感兴趣.将来我可能会用到我的这段代码.

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