这是我的问题。如果我去Projects#edit
,我无法更改它分配到的课程。如果我尝试为其创建新课程或从现有课程中进行选择,则会收到以下错误:
Couldn't find Course with ID=23 for Project with ID=62
app/controllers/projects_controller.rb:49:in `update'
{...
"project"=>{"title"=>"Sup",
"due_date"=>"2012-01-23",
"course_id"=>"27", # THIS IS THE ID OF THE NEW COURSE I WANT
"course_attributes"=>{"name"=>"Calc I", # THIS IS THE OLD ONE, I don't need this. Why is it passing this?
"number"=>"MATH102",
"user_id"=>"3",
"id"=>"23"},
"description"=>"bla bla bla"},
"commit"=>"Update Project",
"user_id"=>"3",
"id"=>"62"}
所以我可以看到它正在尝试传入course_attributes
,但实际上并没有设置新的course_id
. 我不明白为什么course_attributes
正在通过,其他表格是空白的,并且course_attributes
正在通过,是旧课程的属性。我想将 course_id 设置为course_id
被传递(在本例中为 27)。
项目控制器
def new
@project = @user.projects.new
@courses = @user.courses # Used to populate the collection_select
@project.build_course # I was informed I need to use this to get the form_for to work
end
def edit
@project = Project.find(params[:id])
@courses = @user.courses # Used to populate the collection_select
end
def update
@project = Project.find(params[:id])
@courses = @user.courses
if @project.update_attributes(params[:project])
flash[:notice] = 'Project was successfully updated.'
redirect_to user_projects_path(@user)
else
render :edit
end
end
第 49 行是对update_attributes
.
其他信息
项目.rb
belongs_to :user
belongs_to :course
attr_accessible :course_id, :course_attributes
accepts_nested_attributes_for :course
课程.rb
belongs_to :user
has_many :projects
用户.rb
has_many :projects
has_many :courses
所以一个项目在数据库中有一个 course_id。我目前正在 Projects#new 页面上动态创建或选择现有课程。这是我的表格。我使用 JavaScript 切换在 collection_select 和两个 text_fields 之间切换。
项目/new.html.haml
= form_for [@user, @project] do |f|
# This is shown by default
= f.collection_select :course_id, @courses, :id, :name, { prompt: true }
.hidden # This is hidden by default and shown using a toggle
= f.fields_for :course do |builder|
= builder.text_field :name, class: 'large', placeholder: 'Ex: Calculus I'
= builder.label :number, 'Number'
= builder.text_field :number, class: 'new_project_course_number'
= builder.hidden_field :user_id, value: current_user.id
现在,如果我在新项目页面上,并通过选择现有课程将其附加到课程中,它将正常工作。将创建项目course_id
,并将正确设置。
如果我在新项目页面上,我使用 JavaScript 切换创建课程,然后填写课程名称和课程编号,然后单击创建,那么它也可以工作。将创建课程,并使用正确的course_id
.
很抱歉这篇冗长的帖子,但我想提供我能提供的所有信息。谢谢!
更新 1
路线.rb
resources :users do
resources :projects do
collection do
get 'completed'
match 'course/:course_number' => 'projects#course', as: 'course'
end
end
resources :courses
end