我有一个使用collection_select的表单,可以选择多个组。但是当我尝试创建一个新记录时,它在notifications_controller.rb中失败了。参数正确传递我认为它可能与collection_select作为数组传递有关。我只是不能为我的生活弄清楚如何在控制器中处理它。
undefined method `users' for #<Array:0x007fbb0e891b58>
参数中传递了什么:
"group"=>{"group_id"=>["1", "2"]},
schema.rb
create_table "notifications", force: :cascade do |t|
t.string "title"
t.string "first_name"
end
create_table "notifications_users", id: false, force: :cascade do |t|
t.bigint "user_id", null: false
t.bigint "notification_id", null: false
end
create_table "users", force: :cascade do |t|
t.string "first_name"
t.string "last_name"
t.string "user_type"
t.string "username"
end
new.html.erb
<%= f.label :To %>
<%= collection_select(:group, :group_id, Group.all,:id,:name,
{include_hidden: false}, {:multiple => true})%>
notifications_controller.rb
def create
@notification = Notification.new(notification_params)
if @notification.save
@group = Group.find(params[:group][:group_id])
#raise @group.inspect
@users = @group.users <--this is where it fails
@users.each do |user|
@notification.users << user
end .....
答案 0 :(得分:0)
你可以尝试:
def create
@notification = Notification.new(notification_params)
if @notification.save
@group = Group.where(id: params[:group][:group_id])
@group.each do |group|
@users = group.users <--this is where it fails
@users.each do |user|
@notification.users << user
end
end
end
当您选择多个群组并搜索群组时,您将获得Array
群组。相反,当您使用上述where
时,您将获得ActiveRecordRelation
您必须循环显示此结果并对每条记录使用users
关联。
注意:associations
无法使用Active Record Relations或Arrays。
希望这会有所帮助。如果这对您有用,请告诉我。