我有两个模型,父模型是财产,子模型是电话。当尝试使用嵌套电话数据创建新的属性记录时,我收到一条错误消息:Phones 属性必须存在。
我研究了 Rails Guide 和许多其他文档,但没有确定原因。如果你想查看所有代码,这里有一个公共 github 链接:https://github.com/allenroulston/testnest.git https://github.com/allenroulston/testnest.git
class Property < ApplicationRecord
has_many :phones
accepts_nested_attributes_for :phones
end
class Phone < ApplicationRecord
belongs_to :property
end
# the form accepting the data
<%= form_for(property) do |f| %>
<% if property.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(property.errors.count, "error") %> prohibited this property from being saved:</h2>
<ul>
<% property.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :name %>
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :address %>
<%= f.text_field :address %>
</div>
<div class="field">
<%= f.label :city %>
<%= f.text_field :city %>
</div>
<div class="field">
<%= f.label "Telephone (example: 613 555 1234 )" %>
<%= f.fields_for :phones do |p| %>
Area Code <%= p.text_field :area %>
Exchange <%= p.text_field :exchange %>
Number <%= p.text_field :number %>
<% end %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
# relevant controller methods ##################
# GET /properties/new
def new
@property = Property.new
@property.phones.build
end
# POST /properties
# POST /properties.json
def create
@property = Property.new(property_params)
respond_to do |format|
if @property.save
format.html { redirect_to @property, notice: 'Property was successfully created.' }
format.json { render :show, status: :created, location: @property }
else
format.html { render :new }
format.json { render json: @property.errors, status: :unprocessable_entity }
end
end
end
据我所知,这是因为当您在创建新对象时使用nested_attributes_for时,父对象尚未创建,因此当尝试创建对父对象的引用时,验证失败。要解决此问题,您应该更改为:has_many :phones, inverse_of: :property
.
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