我是RoR的新手并遇到一个让我疯狂的问题,我无法弄明白!
基本上,我创建了一个产品表单,并添加了一个“供应商”选择字段,该字段可以查找我的所有供应商,但现在当我尝试更新当前产品或创建新产品时,我收到以下错误:
ActiveRecord::AssociationTypeMismatch in ProductsController#create
Supplier(#2178099880) expected, got String(#2148287480)
我理解错误告诉我的是什么,但我不明白为什么。我也以同样的方式创建了产品类别的关联,这很好用!
此外,如果我添加验证以验证供应商的存在,即使选择了供应商,我也会收到“供应商不能为空”的错误。
真的很感激一些帮助!
在我的_form.html中,我有:
<%= f.label :supplier %>
<%= f.select(:supplier, Supplier.find(:all).collect {|c| [ c.name, c.id ]}, :include_blank => true) %>
产品控制器:
class ProductsController < ApplicationController
# GET /products
# GET /products.xml
def index
@products = Product.all
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @products }
end
end
# GET /products/1
# GET /products/1.xml
def show
@product = Product.find(params[:id])
respond_to do |format|
format.html # show.html.erb
format.xml { render :xml => @product }
end
end
# GET /products/new
# GET /products/new.xml
def new
@product = Product.new
respond_to do |format|
format.html # new.html.erb
format.xml { render :xml => @product }
end
end
# GET /products/1/edit
def edit
@product = Product.find(params[:id])
end
# POST /products
# POST /products.xml
def create
@product = Product.new(params[:product])
respond_to do |format|
if @product.save
format.html { redirect_to(@product, :notice => 'Product was successfully created.') }
format.xml { render :xml => @product, :status => :created, :location => @product }
else
format.html { render :action => "new" }
format.xml { render :xml => @product.errors, :status => :unprocessable_entity }
end
end
end
# PUT /products/1
# PUT /products/1.xml
def update
@product = Product.find(params[:id])
respond_to do |format|
if @product.update_attributes(params[:product])
format.html { redirect_to(@product, :notice => 'Product was successfully updated.') }
format.xml { head :ok }
else
format.html { render :action => "edit" }
format.xml { render :xml => @product.errors, :status => :unprocessable_entity }
end
end
end
# DELETE /products/1
# DELETE /products/1.xml
def destroy
@product = Product.find(params[:id])
@product.destroy
respond_to do |format|
format.html { redirect_to(products_url) }
format.xml { head :ok }
end
end
end
产品型号:
class Product < ActiveRecord::Base
belongs_to :supplier
belongs_to :categories
default_scope :order => 'product_number'
validates_presence_of :product_name, :product_number, :category, :opening_order, :initial_cover,
:country_of_origin, :supplier
validates_uniqueness_of :product_number
# Paperclip
has_attached_file :image, :styles => { :medium => "300x300>", :thumb => "100x100>" }
end
答案 0 :(得分:8)
不是为supplier
创建表单字段,而是尝试为supplier_id
创建表单:
<%= f.label :supplier_id %>
<%= f.select(:supplier_id, Supplier.find(:all).collect {|c| [ c.name, c.id ]}, :include_blank => true) %>
答案 1 :(得分:2)
报告可能发生的另一个原因:在我的情况下,我在资源的创建形式中接受属性,但我忘了添加&#34; accepts_nested_attributes_for&#34;在父模型中..希望它有所帮助!
答案 2 :(得分:1)
在我的情况下,我不小心覆盖了is_a?我的一个ActiveRecord模型上的方法。这很糟糕。
class MyClass << ActiveModel::Base
def is_a?(foo)
return false
end
end
与此模型的关联将因此失败......
希望这有助于其他人...