组织和用户这两个模型具有一对多关系。我有一个组合注册表单，其中一个组织加上该组织的用户进行了注册。
我遇到的问题是：当为用户提交无效信息时，它会再次呈现表单，但不会显示用户的错误消息（例如“用户名不能为空”）。当提交有效信息时，该表单确实有效，并且它确实为组织显示错误消息，但不为用户显示错误消息。
我应该如何调整下面的代码以便也显示用户的错误消息？
def new
@organization = Organization.new
@user = @organization.users.build
end
def create
@organization = Organization.new(new_params.except(:users_attributes)) #Validations require the organization to be saved before user, since user requires an organization_id. That's why users_attributs are above excluded and why below it's managed in a transaction that rollbacks if either organization or user is invalid. This works as desired.
@organization.transaction do
if @organization.valid?
@organization.save
begin
# I executed next line in debugger (with invalid user info), which correctly responds with: ActiveRecord::RecordInvalid Exception: Validation failed: Email can't be blank, Email is invalid, Username can't be blank, etc.
@organization.users.create!(users_attributes)
rescue
# Should I perhaps add some line here that adds the users errors to the memory?
raise ActiveRecord::Rollback
end
end
end
if @organization.persisted?
flash[:success] = "Yeah!"
redirect_to root_url
else
@user = @organization.users.build(users_attributes) # Otherwise the filled in information for user is gone (fields for user are then empty)
render :new
end
end
表单视图包括：
<%= form_for @organization, url: next_url do |f| %>
<%= render partial: 'shared/error_messages', locals: { object: f.object, nested_models: f.object.users } %>
<%= f.text_field :name %>
# Other fields
<%= f.fields_for :users do |p| %>
<%= p.email_field :email %>
# Other fields
<% end %>
<%= f.submit "Submit" %>
<% end %>
部分错误信息如下：
<% object.errors.full_messages.each do |msg| %>
<li><%= msg.html_safe %></li>
<% end %>
Update:按照罗布的回答的步骤，我得到了下面的部分错误。这仍然不会为用户显示错误消息。由于某种原因，我在下面的代码中添加了调试器响应nested_model.errors.any?返回 false，而控制器内的调试器（见上文）确实为用户返回错误消息。
<% if object.errors.any? %>
<div id="error_explanation">
<div class="alert alert-danger">
The form contains <%= pluralize(object.errors.count, "error") %>.
</div>
<ul>
<% object.errors.full_messages.each do |msg| %>
<li><%= msg.html_safe %></li>
<% end %>
</ul>
</div>
<% end %>
<% if defined?(nested_models) && nested_models.any? %>
# Debugger: responds with "local-variable" for "defined?(nested_models)" and for "nested_models.any?" returns true.
<div id="error_explanation">
<ul>
<% nested_models.each do |nested_model| %>
# Debugger: "nested_model" has the same values as "nested_models.any?", as you would expect. But for "nested_model.errors.any?" it returns false, which it shouldn't.
<% if nested_model.errors.any? %> #Initially had "unless nested_model.valid?" but then errors for User are immediately displayed on loading the form page (new method).
<ul>
<% nested_model.errors.full_messages.each do |msg| %>
<li><%= msg.html_safe %></li>
<% end %>
</ul>
<% end %>
<% end %>
</ul>
</div>
<% end %>
