AssociationTypeMismatch (User(#301360) 预期，得到了 Hash(#88300)) 在 Rails

Question

我尝试从嵌套的 json 创建一个对象。但我收到 AssociationTypeMismatch 错误。 我是 ruby​​ on rails 的新手，不确定，这是正确的方法。 我很感谢任何提示。

错误出现在avatars_controller.rb中的“@avatar.from_json(json)”这一行

头像.rb

class Avatar < ActiveRecord::Base
  has_one :user
  accepts_nested_attributes_for :user
end

用户.rb

class User < ActiveRecord::Base
  belongs_to :avatar
end

json

[
 {
    "id": 7,
    "user": {
        "id": 47,
        "gender": "male",
        "name": "Mark",
        "created_at": "2015-01-07T11:44:50.991Z",
        "updated_at": "2015-01-28T14:39:03.900Z"
    },
    "login_counter": 5,
    "created_at": "2015-01-28T14:39:03.896Z",
    "updated_at": "2015-03-03T12:11:43.432Z"
}
]   

avatars_controller.rb

def get_data_button  
  json= open("http..." ).read
  @avatar = Avatar.new
  @avatar.from_json(json)

  respond_to do |format|
    if @avatar.save
      format.html { redirect_to user_url  }
    else
      format.html { render :new }
    end
  end
end

def avatar_params
  params.require(:avatar).permit( :login_counter, user: [:gender, :name])
end

Answer 1

请尝试使用此代码。

params.require(:avatar).permit( :login_counter, user_attributes: [:gender, :name])

[
 {
"id": 7,
"user_attributes": {
    "id": 47,
    "gender": "male",
    "name": "Mark",
    "created_at": "2015-01-07T11:44:50.991Z",
    "updated_at": "2015-01-28T14:39:03.900Z"
},
"login_counter": 5,
"created_at": "2015-01-28T14:39:03.896Z",
"updated_at": "2015-03-03T12:11:43.432Z"

} ]