[英]Rails 4 nested attributes not saving
I cannot seem to get nested attributes to save to the database. 我似乎无法获得嵌套属性来保存到数据库。 I am using Rails 4.
我正在使用Rails 4。
Here are my models : 这是我的模特:
class Answer < ActiveRecord::Base
belongs_to :question
end
class Question < ActiveRecord::Base
has_many :answers
belongs_to :survey
accepts_nested_attributes_for :answers, allow_destroy: true
end
class Survey < ActiveRecord::Base
has_many :questions
validates_presence_of :name
accepts_nested_attributes_for :questions
end
Here is the controller: 这是控制器:
def create
@survey = Survey.new(survey_params)
respond_to do |format|
if @survey.save
format.html { redirect_to @survey, notice: 'Survey was successfully created.' }
format.json { render action: 'show', status: :created, location: @survey }
else
format.html { render action: 'new' }
format.json { render json: @survey.errors, status: :unprocessable_entity }
end
end
end
def survey_params
params.require(:survey).permit(:name, questions_attributes:[:content, :id, :survey_id,
answers_attributes:[:content, :id, :questions_id]
])
end
Finally, here is the form itself. 最后,这是表单本身。 I have tried using both f.fields_for and just fields_for
我尝试过使用f.fields_for和fields_for
<%= form_for(@survey) do |f| %>
<% if @survey.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@survey.errors.count, "error") %> prohibited this survey from being saved:</h2>
<ul>
<% @survey.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :name %><br>
<%= f.text_field :name %>
</div>
<%= f.fields_for :question do |builder| %>
<%= builder.label :content %>
<%= builder.text_area :content %>
<%= f.fields_for :answer do |builder| %>
<%= builder.label :content, "Answer" %>
<%= builder.text_field :content %>
<% end %>
<% end %>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
The survey saves fine to the database, put the questions and answers will not. 调查可以很好地保存数据库,不会提出问题和答案。 I've looked at every resource I could find and it seems like I am doing this correctly, so it's really driving me crazy.
我已经查看了我能找到的所有资源,看起来我正确地做到了这一点,所以这真的让我发疯了。
This example is just a quick scaffold so I had some code to paste in, but I can't seem to get it to work anywhere else. 这个例子只是一个快速的脚手架,所以我有一些代码要粘贴,但我似乎无法让它在其他任何地方工作。
edit: changing my new action to something like this : 编辑:将我的新动作更改为以下内容 :
def new
@survey = Survey.new
@survey.questions.build
end
WORKED! 成功了!
SEE TEEGS ANSWER FOR SOLUTION TO THIS 请寻求解决方案以获得解决方案
Here is the new form I am using, still only saving the survey name 这是我正在使用的新表单,仍然只保存调查名称
<%= f.fields_for :question do |question_builder| %>
<%= form_for(@survey) do |f| %>
<% if @survey.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@survey.errors.count, "error") %> prohibited this survey from being saved:</h2>
<ul>
<% @survey.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :name %><br>
<%= f.text_field :name %>
</div>
<%= f.fields_for :question do |question_builder| %>
<%= question_builder.label :content %>
<%= question_builder.text_area :content %>
<%= question_builder.fields_for :answer do |answer_builder| %>
<%= answer_builder.label :content, "Answer" %>
<%= answer_builder.text_field :content %>
<% end %>
<% end %>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
Looks like you're using the wrong form builder object. 看起来你正在使用错误的表单构建器对象。 Change the question section to something like this:
将问题部分更改为以下内容:
<%= f.fields_for :question do |question_builder| %>
<%= question_builder.label :content %>
<%= question_builder.text_area :content %>
<%= question_builder.fields_for :answer do |answer_builder| %>
<%= answer_builder.label :content, "Answer" %>
<%= answer_builder.text_field :content %>
<% end %>
<% end %>
Originally you were using the f
form builder in the line f.fields_for :answers...
, however given your model code, since it is a Question
that accepts_nested_attributes_for
an Answer
, we simply exchange the form builder object for the one used for the question
section. 本来你正在使用的
f
在该行表单生成f.fields_for :answers...
,然而,考虑模型的代码,因为它是一个Question
是accepts_nested_attributes_for
的Answer
,我们只是交换表单生成器对象用于对一个question
部分。
Note: I changed the names of the builder objects for clarity. 注意:为清楚起见,我更改了构建器对象的名称。
Update 更新
In order to build a deeply nested relationship like this, you will have to loop through your "built" association ( questions
in this case), and invoke build
again on its has_many
association. 为了构建这样一个深层嵌套的关系,你必须遍历你的“构建”关联(在这种情况下是
questions
),并再次在其has_many
关联上调用build
。 So going off of gabrielhilal's answer, you would do this: 所以关闭gabrielhilal的答案,你会这样做:
def new
@survey = Survey.new
@survey.questions.build
@survey.questions.each do |question|
question.answers.build
end
end
Note that in your case, since you are explicitly creating only one question, you can technically do this instead (instead of the loop): 请注意 ,在您的情况下,由于您只是明确地创建了一个问题,因此您可以在技术上改为执行此操作(而不是循环):
@survey.questions.first.answers.build
Disclaimer: If there is a cleaner, more Rails-y, way to do this, I am sadly unaware of it. 免责声明:如果有更清洁,更多的Rails-y,这样做的方式,我很遗憾没有意识到这一点。
In your controller you have questions_id
: 在您的控制器中,您有
questions_id
:
def survey_params
params.require(:survey).permit(:name,
questions_attributes: [
:content, :id, :survey_id,
answers_attributes: [:content, :id, :questions_id]
]
)
end
Is that a typo? 那是一个错字吗? Also try setting
action_on_unpermitted_parameters
to :raise
in you development.rb
to see if there is any attribute that you' re missing in your survey_params
method. 还可以尝试将
action_on_unpermitted_parameters
设置为:raise
在您的development.rb
:raise
,以查看您的survey_params
方法中是否存在任何缺少的属性。
# In case of unpermitted parameters in the controller raise error.
config.action_controller.action_on_unpermitted_parameters = :raise
You must change your new
action to include @survey.questions.build
: 您必须更改
new
操作以包含@survey.questions.build
:
def new
@survey = Survey.new
@survey.questions.build
end
But your form is wrong as well. 但你的形式也是错的。 Change the
question
to questions
将
question
更改为questions
<%= f.fields_for :questions do |builder| %> #questions
<%= builder.label :content %>
<%= builder.text_area :content %>
You must do the same thing for answers. 你必须为答案做同样的事情。
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