我希望实现一个带有复选框的动态下拉列表,以便消息的发送者可以选择多个接收者。
目前我在消息文本区域下只有一个收件人列表。
_recipients.html.erb:
<% @recipients.each do |user| %>
<label for="user<%= user.id %>" >
<span class="list-group-item"><%= user.full_name %></span>
<%= check_box_tag "message[user_tokens][]", user.id, @message.users.include?(user), id: "user#(user.id)", class: "form-control" %>
</label>
用户.rb:
class User < ActiveRecord::Base
rolify
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
validates :full_name, presence:true,
length: {minimum: 4 }
has_many :messages, foreign_key: :sender_id
has_many :notes
has_many :homeworks
has_many :hw_comments
belongs_to :classmodule
belongs_to :student
收件人.rb:
class Recipient < ActiveRecord::Base
belongs_to :message
belongs_to :user
validates :user_id, presence: true
end
消息控制器.rb:
class MessagesController < ApplicationController
before_action :authenticate_user!
def new
@message = Message.new
@recipients = User.all
@recipients = @recipients.page(params[:page]).per(8)
end
def create
@message = current_user.messages.build(message_params)
if @message.save
flash[:success] = "Message sent"
redirect_to messages_path
else
flash[:alert] = "Something went wrong"
render :new
end
end
def index
@messages = Recipient.where(:user_id => current_user.id).order('created_at DESC')
end
private
def message_params
params.require(:message).permit(:title, :body, :sender_id, user_tokens: [])
end
end
例如,是否可以使用 collection_select 将复选框和名称放入下拉列表中?如果需要,很高兴提供更多代码。谢谢。