如何使用has_many添加現有記錄：通過rails中的關聯

Question

我是rails新手。 我有一些小問題。我需要將項目添加到某個用戶個人資料頁面。例如：用戶必須進入項目頁面，並使用按鈕「添加到配置文件」。 它應該將該項目添加到用戶配置文件。

但是當我使用 「添加」

ActiveRecord::RecordNotFound (Couldn't find Profile with 'id'=): 
    app/controllers/projects_controller.rb:15:in `add' 

我有三個型號：

class ProjectList < ActiveRecord::Base 

    belongs_to :profile 
    belongs_to :project 

end 

class Project < ActiveRecord::Base 
    has_many :project_lists 
    has_many :profiles, through: :project_lists 

    has_many :charts 
end 

class Profile < ActiveRecord::Base 
    belongs_to :user 

    has_many :project_lists 
    has_many :projects, through: :project_lists 

    has_attached_file :avatar, styles: { thumb: ["64x64#", :jpg, :png] } 
    validates_attachment :avatar, content_type: { content_type: ["image/jpeg", "image/gif", "image/png"] } 


end 

我的控制器：

class ProjectsController < ApplicationController 

    before_action :find_project, only: [:show, :edit, :update, :destroy] 


    def index 
    @projects = Project.all.paginate(page: params[:page], per_page: 5) 
    end 

    def new 
    @project = Project.new 
    end 

    def add 
    @profile = Profile.find(params[:profile_id]) 
    @profile.projects << project 

    end 

    def edit 
    end 

    def update 
    if @project.update(project_params) 
     redirect_to projects_path 
    else 
     render 'edit' 
    end 
    end 

    def create 

    @project = Project.new(project_params) 
    #@project.profiles.build(params[:profile_id]) 

    if @project.save 
     flash[:create] = 'Project created' 
     redirect_to projects_path 
    else 
     render 'new' 
    end 
    end 

    def show 
    end 

    def destroy 
    @project.destroy 
    flash[:destroy] = 'Delete project' 
    redirect_to projects_path 
    end 

    private 

    def project_params 
    params.require(:project).permit(:project_name, :project_id, :description) 
    end 

    def find_project 
    @project = Project.find(params[:id]) 
    end 

end 

簡檔控制器：

class ProfilesController < ApplicationController 

    #before_action :authenticate_user!, except: [:index] 
    before_action :find_profile, only: [ :show, :edit, :update, :destroy] 

    def index 
    @profiles = Profile.all.paginate(page: params[:page], per_page: 5) 
    end 

    def show 

    end 

    def new 
    @profile = Profile.new 
    end 

    def add 
    end 

    def edit 
    end 

    def create 
    end 

    def update 
    respond_to do |format| 
     if @profile.update(profile_params) 
     format.json { head :no_content } 
     format.js 
     format.html do 
      redirect_to '/' 
     end 
     else 
     format.json { render json: @profile.errors.full_messages, 
          status: :unprocessable_entity } 
     end 

    end 
    end 

    def destroy 
    @profile.destroy 

    respond_to do |format| 
     format.js 
     format.html { redirect_to profiles_url } 
     format.json { head :no_content } 
    end 
    end 

    private 

    def profile_params 
    params.require(:profile).permit(:name, :birthday, :biography, :user_id, :avatar, :profile_id) 
    end 

    def find_profile 
    @profile = Profile.find(params[:id]) 
    end 

end 

在我的意見，使用助手：

<%= link_to 'Add', add_to_profile_path(@project), :class => 'btn btn-sm btn-info' %> 

我的路線：

Rails.application.routes.draw do 
    devise_for :users 
    # The priority is based upon order of creation: first created -> highest priority. 
    # See how all your routes lay out with "rake routes". 

    resources :profiles 
    resources :charts 

    get '/projects/add_project/:project_id', to: 'projects#add', as: 'add_to_profile' 
    resources :projects 


    root 'profiles#index' 


end 

在控制檯：

Started GET "/projects/add_project/2" for 127.0.0.1 at 2017-02-17 17:12:55 +0200 
Processing by ProjectsController#add as HTML 
    Parameters: {"project_id"=>"2"} 
    Profile Load (0.1ms) SELECT "profiles".* FROM "profiles" WHERE "profiles"."id" = ? LIMIT 1 [["id", nil]] 
Completed 404 Not Found in 4ms (ActiveRecord: 0.1ms) 

ActiveRecord::RecordNotFound (Couldn't find Profile with 'id'=): 
    app/controllers/projects_controller.rb:15:in `add' 

我是感謝任何幫助。

Answer 1

我找到了解決方案。 首先，我將模型名稱project_list更改爲profiles_projects。

我的模型

class ProfilesProjectsController < ApplicationController 

    def create 
    @profiles_projects = _current_profile.profiles_projects.new(:project_id => params[:project_id]) 

    if @profiles_projects.save 
    render status: 201, json: @profiles_projects 
    end 
end 

    private 

    def _current_profile 
    @current_profile = current_user.profile 
    end 
end 

創建ProfilesProjects控制器，它的工作對我來說。現在我可以將項目添加到配置文件。 也許它會幫助別人