Rails has_many 嵌套属性 + 回形针 gem

Question

我有这个型号：

class Project < ApplicationRecord
    acts_as_taggable
    has_many :documents, dependent: :destroy
    accepts_nested_attributes_for :documents
end

和这个模型：

class Document < ApplicationRecord
    belongs_to :project,inverse_of: :document, dependent: :destroy
    has_attached_file :document, styles: {thumbnail: "60x60#"}
    validates_attachment :document, content_type: { content_type:     "application/pdf" }
end

这是我对 projects_controller.rb 文件的方法：

def new
    @project = Project.new
    @project.documents.build 
end
def project_params
      params.require(:project).permit(:title, :resume, :documents => [:id,:name,:description,:date,:local,:document],
end

这是我对该项目的索引视图：

<td><%= project.title %></td>
 <td><%= project.resume %></td>
 <td><%= project.documents.name %></td>
 <td><%= project.documents.description %></td>
 <td><%= project.documents.date %></td>
 <td><%= project.documents.local %></td>
 <td><%= project.documents.document_file_name %></td>
 <td><%= link_to 'Download', project.documents.document.url(:original, false) %> </td>

当我在文档视图中创建文档时，文档已创建，但是当我想在项目视图中创建文档属性时，出现此错误：

undefined method 'description' for ActiveRecord::Associations::CollectionProxy []

我做错了什么？

Answer 1

在 projects_controller.rb 文件中 project_params 方法将 :documents 更改为 :documents_attributes：

def project_params
  params.require(:project).permit(:title, :resume, :documents_attributes => [:id, :name, :description, :date, :local, :document])
end

Rails has_many 嵌套属性 + 回形针 gem

Rails has_many nested attributes + paperclip gem

ruby

ruby-on-rails

paperclip

nested-forms