Question

我的模特有：

class Link < ActiveRecord::Base

  belongs_to :group
  validates_presence_of :url_address
  validates_presence_of :group_id
  before_save :verify_url
  acts_as_list

  def valid_get?
    HTTParty.get(url_address).code.between?(100,399) ? true : false
  rescue SocketError, URI::InvalidURIError
    false
  end 

  def verify_url
    if valid_get?
      verified_date = Time.now
    end 
  end 

end

当我通过表单创建记录时，verified_date被正确设置为今天的日期。

为什么不更新字段以更新记录？

控制器：

class LinksController < ApplicationController

  before_filter :authorize, :except => [:index, :show, :advanced_search]

  ...

  def verify_link # Used by js. works fine to update the field.
    @link = Link.find(params[:id])
    if @link.valid_get?
      if @link.update_attribute(:verified_date, Time.now)
        render nothing: true, status: 200
      else
        render nothing: true, status: 422
      end
    else
      render nothing: true, status: 422
    end
  end

  def create # Used via the HTML form.  method should update verified_date but doesn't
    @link = Link.new(params[:link])
    @link.content_date = Time.new().strftime("%m/%d/%Y") if @link.content_date.nil?
    if @link.valid_get?
      @link.verified_date = Time.new()
      http_check_msg = 'and the url was verified as valid'
    else
      http_check_msg = 'however it was *not* possible to visit the url as given currently'
    end
    respond_to do |format|
      if @link.save
        flash[:notice] = 'Link was successfully created, ' + http_check_msg
        format.html { redirect_to(@link) }
      else
        flash[:notice] = 'Error, The link was not created.'
        @groups = Group.all.collect { |g| [g.group_name, g.id] }
        format.html { render :action => "new"}
      end
    end
  end

我有javascript通过上面的控制器verify_link方法更新该字段但是常规表单和附带的更新方法似乎没有更新更新方法中的属性 -

  def update
    @link = Link.find(params[:id])

    respond_to do |format|
      if @link.update_attributes(params[:link])
        @link.verify_url
        @link.save
        flash[:notice] = 'Link was successfully updated.'
        format.html { redirect_to(@link.group) }
      else
        @groups = Group.all.collect { |g| [g.group_name, g.id] }
        format.html { render :action => "edit" }
      end 
    end 
  end

Answer 1

将您的方法更改为：

  def verify_url
    if valid_get?
      self.verified_date = Time.now
    end 
  end

请注意self.。如果没有self，您将创建一个新的局部变量，而不是更改模型属性。

Rails - 为什么这个before_save会在创建时触发但不会更新？

1 个答案: