Question

假设视图，控制器和模型几乎相同（显然名称除外），你将如何在你的cli中得到这个params输出：

$ "project"=>{"genres_projects_attributes"=>{"genre_id"=>["1"]}

对比这个参数输出：

$"user"=>{"production_media_users_attributes"=>[{"production_medium_id"=>["1"]}]}

注意第二行中的附加括号[]。第一行有效。第二行没有。没有错误消息。

下面的源代码，但看起来与我相同：控制器

def user_params
  params.fetch(:user, {}).permit(:id, production_media_users_attributes: [:id, :user_id, {production_medium_id: []}])
end

def project_params
    params.fetch(:project, {}).permit(:id, genres_projects_attributes: [:id, :project_id, {genre_id: []}])
end

模型

class User < ActiveRecord::Base
    has_many :production_media, through: :production_media_users
    has_many :production_media_users
    accepts_nested_attributes_for :production_media_users
end

class ProductionMedium < ActiveRecord::Base
    has_many :users, through: :production_media_users
    has_many :production_media_users
end

class Project < ActiveRecord::Base
    has_many :genres, through: :genres_projects
    has_many :genres_projects
    accepts_nested_attributes_for :genres_projects
end

class Genre < ActiveRecord::Base
    has_many :projects, through: :genres_projects
    has_many :genres_projects
end

视图

<%= select_tag 'user[production_media_users_attributes][][production_medium_id][]', options_for_select(ProductionMedium.order(:id).collect{|g| [g.name, g.id]}), { include_hidden: true, multiple: true,  required: true, placeholder: 'Choose One or More', class: 'form-control menu-select2'} %>

<%= select_tag 'project[genres_projects_attributes][][genre_id][]', options_for_select(Genre.order(:id).collect{|g| [g.name, g.id]}), { include_hidden: true, multiple: true,  required: true, placeholder: 'Choose One or More', class: 'form-control menu-select2'} %>

Answer 1

在production_media_users_attributes上有一个额外的冒号，是吗？

params.fetch(:user, {}).permit(:id, :production_media_users_attributes:

Rails质量分配：来自哪里的额外括号？

1 个答案: