Ruby on rails 未在联接表中获取用户\u id

本人有以下表格：

 <h2>Add collaborators to the wiki <strong><%= @wiki.title %></strong></h2>

<%= form_for ([@wiki, @collaboration]) do |f| %>
<% @users.each do |user| %>

<p><%= check_box_tag 'user_ids[]', user.id %>
<%= label_tag 'user_ids[]', user.email %> 
<% end %>

<p> <%= f.submit %> <p>
<% end %>

有什么想法吗？

假设我们有参数[：user_id]=[123456789]

你可以说@wiki.user_id=[123456789]@wiki.save，这将自动生成连接记录。因此，这实际上是对wiki对象的更新，您的表单也应该编辑wiki对象。我想这样做：

<h2>Add collaborators to the wiki <strong><%= @wiki.title %></strong></h2>

<%= form_for (@wiki) do |f| %>
  <% @users.each do |user| %>

    <p><%= check_box_tag 'wiki[user_ids][]', user.id, @wiki.user_ids.include?(user.id) %>
    <%= label_tag 'wiki[user_ids][]', user.email %> 
  <% end %>
  <p> <%= f.submit %> <p>
<% end %>

---

检查create方法中的参数值？它应该是@wiki.collaborations.builduser_id:params[：user_id]@RajarshiDas，但仍然不起作用。Stil get user_id:nilcan您可以发布您的日志，它为user_id提供了什么您将在controller中获得类似于此的参数[：user_id]=>[1,2,3]，并且您可能已在迁移中将user_id定义为整数。将其定义为用户标识，您可以在模型serialize中对其进行序列化：用户标识，数组

 class CollaborationsController < ApplicationController

def new 
  @wiki = Wiki.find(params[:wiki_id])
  @collaboration = @wiki.collaborations.new
  @users = User.all
end

def create
  @wiki = Wiki.find(params[:wiki_id])
  #selected users
  @collaboration = @wiki.collaborations.build(user_id: params[:user_id])
   if @collaboration.save
    redirect_to wikis_path, notice: "Wiki shared."
   else
    flash[:error] = "Error creating wiki. Try again."
    render :new
   end
   end

  end

create_table "collaborations", force: :cascade do |t|
 t.integer  "user_id"
 t.integer  "wiki_id"
 t.datetime "created_at"
 t.datetime "updated_at"
end

create_table "users", force: :cascade do |t|
 t.string   "email",                  default: "", null: false
 t.string   "encrypted_password",     default: "", null: false
 t.string   "reset_password_token"
 t.datetime "reset_password_sent_at"
 t.datetime "remember_created_at"
 t.integer  "sign_in_count",          default: 0,  null: false
 t.datetime "current_sign_in_at"
 t.datetime "last_sign_in_at"
 t.string   "current_sign_in_ip"
 t.string   "last_sign_in_ip"
 t.datetime "created_at"
 t.datetime "updated_at"
 t.string   "role"
end

 add_index "users", ["email"], name: "index_users_on_email", unique: true
 add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true

create_table "wikis", force: :cascade do |t|
 t.string   "title"
 t.text     "body"
 t.boolean  "private"
 t.integer  "user_id"
 t.datetime "created_at", null: false
 t.datetime "updated_at", null: false
end

add_index "wikis", ["user_id"], name: "index_wikis_on_user_id"

create_table "wikis_and_collaborators", force: :cascade do |t|
 t.integer  "user_id"
 t.integer  "wiki_id"
 t.datetime "created_at"
 t.datetime "updated_at"
end

end

<h2>Add collaborators to the wiki <strong><%= @wiki.title %></strong></h2>

<%= form_for (@wiki) do |f| %>
  <% @users.each do |user| %>

    <p><%= check_box_tag 'wiki[user_ids][]', user.id, @wiki.user_ids.include?(user.id) %>
    <%= label_tag 'wiki[user_ids][]', user.email %> 
  <% end %>
  <p> <%= f.submit %> <p>
<% end %>

def update
  @wiki = Wiki.find_by_id(params[:id])
  @wiki.update_attributes(params[:wiki])
  redirect_to wiki_path(@wiki) #or whatever
end