我有以下模型来描述步骤和产品之间的多对多关系：
class Step < ApplicationRecord
has_and_belongs_to_many :products
end
class Product < ApplicationRecord
has_and_belongs_to_many :steps
end
class ProductsStep < ApplicationRecord
belongs_to :product
belongs_to :step
end
这些是我的桌子：
步骤：
Column | Type | Modifiers | Storage | Stats target | Description
-------------+-----------------------------+----------------------------------------------------+----------+--------------+-------------
id | bigint | not null default nextval('steps_id_seq'::regclass) | plain | |
name | character varying | not null | extended | |
created_at | timestamp without time zone | | plain | |
updated_at | timestamp without time zone | | plain | |
Indexes:
"steps_pkey" PRIMARY KEY, btree (id)
"index_steps_on_weeks_id" btree (weeks_id)
产品：
Column | Type | Modifiers | Storage | Stats target | Description
--------------------+-----------------------------+-------------------------------------------------------+----------+--------------+-------------
id | bigint | not null default nextval('products_id_seq'::regclass) | plain | |
name | character varying | not null | extended | |
photo_file_name | character varying | | extended | |
photo_content_type | character varying | | extended | |
photo_file_size | integer | | plain | |
photo_updated_at | timestamp without time zone | | plain | |
created_at | timestamp without time zone | not null | plain | |
updated_at | timestamp without time zone | not null | plain | |
Indexes:
"products_pkey" PRIMARY KEY, btree (id)
产品步骤：
Column | Type | Modifiers | Storage | Stats target | Description
------------+-----------------------------+-----------+---------+--------------+-------------
step_id | integer | not null | plain | |
product_id | integer | not null | plain | |
created_at | timestamp without time zone | not null | plain | |
updated_at | timestamp without time zone | not null | plain | |
Indexes:
"products_steps_pkey" PRIMARY KEY, btree (product_id, step_id)
我想保存相关步骤的产品，但是我收到以下消息：
在81毫秒内完成422个不可处理的实体（ActiveRecord：10.6毫秒）
ActiveRecord :: RecordInvalid（验证失败：步骤无效）
我做了以下事情：
def create
steps = Array.new()
params[:product][:steps].split(/,/).each do |s|
steps << s.to_i
end
@product = Product.new(product_params)
@product.steps << Step.where(:id => steps)
puts "#{@product.steps.first.name}" #the name is printed
product = Product.find_by(name: @product.name, brand: @product.brand)
if product.nil?
if @product.save!
render :json => {:status => :success}
end
end
end
steps参数是一个类似于“ 1,2,3”的字符串，它表示步骤ID。
我不知道自己做错了什么，在其他情况下我做的完全一样，而且奏效了。
编辑：
这是我所有的请求和错误消息，包括未通过的验证：
Bad request content body
Started POST "/products/?product[name]=test+1&product[brand]=test&product[released_for]=Low+Poo&product[weight]=50.0&product[measurement]=g&product[steps]=1%2C2%2C3&product[user_id]=test%40gmail.com&" for 192.168.2.5 at 2018-06-19 17:56:23 -0300
Processing by ProductsController#create as HTML
Parameters: {"product"=>{"name"=>"test 1", "brand"=>"test", "released_for"=>"Low Poo", "weight"=>"50.0", "measurement"=>"g", "steps"=>"1,2,3", "user_id"=>"test@gmail.com"}}
Unpermitted parameter: :steps
Step Load (0.4ms) SELECT "steps".* FROM "steps" WHERE "steps"."id" IN ($1, $2, $3) [["id", 1], ["id", 2], ["id", 3]]
↳ app/controllers/products_controller.rb:73
------LOGS-------
#<ActiveModel::Errors:0x007f2840acb628 @base=#<Product id: nil, name: "Test 1", brand: "Test", measurement: "g", weight: #<BigDecimal:7f28409f2ee0,'0.5E2',9(18)>, photo_file_name: nil, photo_content_type: nil, photo_file_size: nil, photo_updated_at: nil, released_for: "Low Poo", created_at: nil, updated_at: nil, user_id: "test@gmail.com">, @messages={:steps=>["não é válido"]}, @details={:steps=>[{:error=>:invalid}, {:error=>:invalid}, {:error=>:invalid}]}>
-------------
Hidratação
Product Load (0.3ms) SELECT "products".* FROM "products" WHERE "products"."name" = $1 AND "products"."brand" = $2 LIMIT $3 [["name", "Test 1"], ["brand", "Test"], ["LIMIT", 1]]
↳ app/controllers/products_controller.rb:78
#<ActiveModel::Errors:0x007f2840acb628 @base=#<Product id: nil, name: "Test 1", brand: "Test", measurement: "g", weight: #<BigDecimal:7f28409f2ee0,'0.5E2',9(18)>, photo_file_name: nil, photo_content_type: nil, photo_file_size: nil, photo_updated_at: nil, released_for: "Low Poo", created_at: nil, updated_at: nil, user_id: "test@gmail.com">, @messages={:steps=>["não é válido"]}, @details={:steps=>[{:error=>:invalid}, {:error=>:invalid}, {:error=>:invalid}]}>
(0.2ms) BEGIN
↳ app/controllers/products_controller.rb:82
(0.2ms) ROLLBACK
↳ app/controllers/products_controller.rb:82
Completed 422 Unprocessable Entity in 75ms (ActiveRecord: 9.4ms)
ActiveRecord::RecordInvalid (A validação falhou: Steps não é válido):
app/controllers/products_controller.rb:82:in `create'
答案 0 :(得分：1)
根据共享的描述，似乎以下提到的问题之一可能引发了异常。
首先，下面提到的日志记录显示，除了将所有其他参数都允许数据库外，只允许步骤。
Parameters: {"product"=>{"name"=>"test 1", "brand"=>"test", "released_for"=>"Low Poo", "weight"=>"50.0", "measurement"=>"g", "steps"=>"1,2,3", "user_id"=>"test@gmail.com"}}
Unpermitted parameter: :steps
因此，user_id列是否具有数据类型字符串，在共享的表结构中也找不到user_id列。
第二，对于ActiveRecord :: RecordInvalid，当对相应模型的验证失败时会引发此问题。
请检查上述情况是否发生验证失败。
答案 1 :(得分：0)
验证失败：步骤无效。这意味着您传递的步骤ID无效。您可以打印@product和@ product.steps来检查正在打印什么。当我检查代码@product.steps << Step.where(:id => steps)时，此代码将组成array数组，因此它必须为@product.steps = Step.where(:id => steps)或@product.steps += Step.where(:id => steps)。打印@product和@ product.steps，可以清楚地说明要在表中保存哪些数据。