Question

所以我的问题或多或少如下。我有一个带有以下类的rails应用程序：

用户
技能

每个用户都可以拥有多种技能，并且可以从用户配置文件屏幕添加这些技能，这是用户控制器的显示操作。目前我已经设置了技能并且能够创建但我无法在用户配置文件中添加预先构建的技能。当我尝试提交时，我收到以下错误Empty list of attributes to change

以下是我对用户操作的添加技巧：

def add_skill_to_user
    user = User.find(params[:id])
    user.skills.create(skill_params) #skill name, level...
    @skills_options = Skill.all.map{|s| [ s.name, s.id] }
    #whatever happens when this is is done, redirect, json answer etc...
    if user.skills.update_all(skill_params)
      flash[:success] = "Skill Added"
    else
       render 'add_skill_to_user'
    end
  end

  private
    # Set skills params whitelist    
    def skill_params
      params.permit(:name, :user_id)
    end

以及以下路线

post 'users/:id/add_skill_to_user' => 'users#add_skill_to_user'

这是我的表格

<%= form_tag({controller: "users", action: "add_skill_to_user"}, method: "put") do %>
    <%= collection_select(:skill, :name, Skill.all, :id, :name) %>
    <%= submit_tag 'Submit' %>
<%end%>

让我知道您需要的任何其他信息。

--------- 添加了型号代码 ------------------

User.rb

class User < ActiveRecord::Base
    attr_accessor :remember_token, :activation_token, :reset_token
    before_save   :downcase_email
    before_create :create_activation_digest

    belongs_to :group
    has_many :ranks
    has_many :skills
    has_many :mission_notes
    has_and_belongs_to_many :training_events
    accepts_nested_attributes_for :skills

    validates :username, presence: true
    validates :email, presence: true
    VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
    validates :email, presence: true, length: { maximum: 255 },
                    format: { with: VALID_EMAIL_REGEX },
                    uniqueness: { case_sensitive: false }
    validates :group_id, presence: true
    has_secure_password
    validates :password, length: { minimum: 6 }, allow_blank: true

    # Returns the hash digest of the given string.
    def User.digest(string)
        cost = ActiveModel::SecurePassword.min_cost ? BCrypt::Engine::MIN_COST :
                                                      BCrypt::Engine.cost
        BCrypt::Password.create(string, cost: cost)
    end

    # Returns a random token.
    def User.new_token
        SecureRandom.urlsafe_base64
    end

    # Remembers a user in the database for use in persistent sessions.
    def remember
        self.remember_token = User.new_token
        update_attribute(:remember_digest, User.digest(remember_token))
    end

    # Returns true if the given token matches the digest.
    def authenticated?(remember_token)
        return false if remember_digest.nil?
        BCrypt::Password.new(remember_digest).is_password?(remember_token)
    end

    # Forgets a user.
    def forget
        update_attribute(:remember_digest, nil)
    end

    # Converts email to all lower-case.
    def downcase_email
      self.email = email.downcase
    end

    # Creates and assigns the activation token and digest.
    def create_activation_digest
      self.activation_token  = User.new_token
      self.activation_digest = User.digest(activation_token)
    end

    # Returns true if the given token matches the digest.
    def authenticated?(attribute, token)
        digest = send("#{attribute}_digest")
        return false if digest.nil?
        BCrypt::Password.new(digest).is_password?(token)
    end

    # Activates an account.
      def activate
        update_attribute(:activated,    true)
        update_attribute(:activated_at, Time.zone.now)
      end

      # Sends activation email.
      def send_activation_email
        UserMailer.account_activation(self).deliver
      end

      # Sets the password reset attributes.
  def create_reset_digest
    self.reset_token = User.new_token
    update_attribute(:reset_digest,  User.digest(reset_token))
    update_attribute(:reset_sent_at, Time.zone.now)
  end

  # Sends password reset email.
  def send_password_reset_email
    UserMailer.password_reset(self).deliver
  end

  def password_reset_expired?
    reset_sent_at < 2.hours.ago
  end


end

Skill.rb

class Skill < ActiveRecord::Base
    belongs_to :user
end

Answer 1

您的collection_select会产生类似

的内容

<select name="skill[name]">
  <option value="1">First Skill</option>
  ...
</select>

其中"skill[name]"并未反映选项值（技能ID）中的内容。

此外，您的参数白名单并不能处理select生成的POST数据是一个数组的事实。

我建议

<%= collection_select(:skill, :id, Skill.all, :id, :name) %>

在控制器中使用此白名单过滤器：

params.require(:skill).permit(:id)

但是你的add_skill_to_user方法令人困惑。如果您只想为用户分配预先存在的技能，there is a RailsCast for that。

无法提交添加操作表单 - Rails 4

1 个答案: