Ruby on Rails 参数设置收件人和发件人 users_id

Question

rails 中的消息系统有一个收件人和发件人，两者都是相同的 class(Message)。想要为两者设置参数，即如果用户创建消息，默认情况下发件人是 user_id，收件人将是从用户联系人列表中选择的联系人。

目前数据库只接收到 recipient_id 列的 user_id，这是错误的，应该是 sender_id 列。 Sender_id 什么也没收到。

看完后，有人说不要修改参数，因为这是不好的做法。因此，在消息视图中设置一个隐藏字段（如 body 和标题），但这并没有推送到数据库中。

两个问题，这个过程是否合适 rails 实践？（问这个作为rails的新手）如果不是：你能建议另一条路或方向吗？如果是：任何 ideas/thoughts 为什么这没有保存到数据库中？

用户模型

class User < ActiveRecord::Base

  has_many :messages, class_name: "Message", foreign_key: "recipient_id"
  has_many :sent_messages, class_name: "Message", foreign_key: "sender_id"

  has_many :contacts, dependent: :destroy
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  validates_presence_of :firstname, allow_blank: false
  validates_presence_of :surname, allow_blank: false

end

消息模型

class Message < ActiveRecord::Base

  belongs_to :sender, class_name: "User", foreign_key: "sender_id"
  belongs_to :recipient, class_name: "User", foreign_key: "recipient_id"

    validates_presence_of :body, :title
end

消息控制器

class MessagesController < ApplicationController

  before_action :message, only: [:show]
  before_action :authenticate_user!

  def index
    @messages = current_user.messages
  end

  def new
    @message = Message.new
  end

  def create
    current_user.messages.create(message_params)
    redirect_to '/messages'
  end

  def show
  end

  private

  def message_params
    params.require(:message).permit(:title, :body, :sender_id, :recipient_id)
  end

  def message
    @message = Message.find(params[:id])
  end

end

message/new 查看

<%= form_for @message do |f| %>
     <%= hidden_field_tag :sender_id, current_user.id %>
     <%= f.text_field :title %>
     <%= f.text_field :body %>
     <%= f.submit %>
<% end %>

架构

ActiveRecord::Schema.define(version: 20160517131719) do

  # These are extensions that must be enabled in order to support this database
  enable_extension "plpgsql"

  create_table "contacts", force: :cascade do |t|
    t.string   "firstname"
    t.string   "surname"
    t.string   "email"
    t.integer  "phone"
    t.datetime "created_at",         null: false
    t.datetime "updated_at",         null: false
    t.string   "image_file_name"
    t.string   "image_content_type"
    t.integer  "image_file_size"
    t.datetime "image_updated_at"
    t.integer  "user_id"
  end

  add_index "contacts", ["user_id"], name: "index_contacts_on_user_id", using: :btree

  create_table "messages", force: :cascade do |t|
    t.string   "title"
    t.text     "body"
    t.integer  "sender_id"
    t.integer  "recipient_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.inet     "current_sign_in_ip"
    t.inet     "last_sign_in_ip"
    t.datetime "created_at",                          null: false
    t.datetime "updated_at",                          null: false
    t.string   "firstname"
    t.string   "surname"
  end

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

  add_foreign_key "contacts", "users"
end

Answer 1

尝试将您的表单更改为：

<%= form_for @message do |f| %>
  <%= f.hidden_field :sender_id, value: current_user.id %> 
  <%= f.text_field :title %>
  <%= f.text_field :body %>
  <%= f.submit %>
<% end %>

Answer 2

Currently the database is only receiving a user_id to the recipient_id column which is wrong and should be to sender_id column.

在您的 create 操作中，您有 current_user.messages.create(message_params)。这会在 DB 中使用 外键的 （即 recipient_id 在你的例子中）值与 parent's(user) id。就是这个原因，recipient_id得到的值是user's id.

Sender_id receives nothing.

这是因为 sender_id 的 hidden_field 集没有用 form builder 实例包装。你需要改变

<%= hidden_field_tag :sender_id, current_user.id %>

至

<%= f.hidden_field :sender_id, current_user.id %>

Ruby on Rails 参数设置收件人和发件人 users_id

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