Question

我有absense.html.erb，在开发和制作方面效果很好。但是，当我尝试访问该页面时，我收到以下错误：

2013-03-25T18：43：43 + 00:00 app [web.1]：开始获取“/缺席”   77.100.90.77 at 2013-03-25 18:43:43 +0000 2013-03-25T18：43：43 + 00:00 app [web.1]：2013-03-25T18：43：43 + 00:00 app [web.1]：   ActiveRecord :: StatementInvalid（PG ::错误：错误：列“已请求”   不存在2013-03-25T18：43：43 + 00:00 app [web.1]：LINE 1：... LECT   “假期”。*来自“假期”WHERE（州=“请求...   2013-03-25T18：43：43 + 00:00 app [web.1]：
  ^ 2013-03-25T18：43：43 + 00:00 app [web.1] :: SELECT“holidays”。* FROM   “假期”WHERE（州=“请求”））：2013-03-25T18：43：43 + 00:00   app [web.1]：2013-03-25T18：43：43 + 00:00 app [web.1]：   2013-03-25T18：43：43 + 00:00 app [web.1]：
  app / controllers / holidays_controller.rb：52：在'缺席'   2013-03-25T18：43：43 + 00:00 heroku [router]：at = info method = GET   path = / rota_days host = miuk-portal.herokuapp.com fwd =“77.100.90.77”   dyno = web.1 queue = 0 wait = 0ms connect = 1ms service = 5773ms status = 200   字节= 897173

错误指向我的控制器中的absense方法的以下行

def absence
#show the holidays where the approver id matches the current user id
#and state = "requested"'

    @user = current_user
    if current_user.role? :administrator
      # a superadmin can view all current holiday requests
      @holidays = Holiday.find(:all, :conditions => 'state = "requested"')
    else
      #otherwise an admin sees the holiday requests that they are approvers for
      @holidays = Holiday.find(:all, :conditions => ["approver_id = #{current_user.id}", "state = requested"])
    end
  end

我已在假日模型中声明了这一点，如下所示：

Holiday.rb

class Holiday < ActiveRecord::Base

  belongs_to :user
  belongs_to :calendar
  belongs_to :type, :class_name => "Type"
  belongs_to :approver, :class_name => "User"


  before_create :default_values #Before creating holiday set default_values
                                #before_create :overflow


  validates :start_at, :presence => { :message => "must be a valid date/time" }
  validates :end_at, :presence => {:message => "must be a valid date/time"}
  validate :start_must_be_before_end_date
  validate :overflow #Hook method to determine if user holidays are over the set amount
  validates_presence_of :end_at, :start_at

  attr_accessible :description, :end_at, :start_at, :state, :type_id, :user_id, :color


  def length
    (self.end_at.to_i - self.start_at.to_i)/(60*60*24)
  end

  def days_used
    ( (start_at.to_date)..(end_at.to_date) ).select {|d| (1..5).include?(d.wday) }.size
  end


  #Validates_presence_of is called to ensure that the start date exisit.
  #Start date must be lt or = to end date otherwise throw error.
  def start_must_be_before_end_date
    errors.add(:start_at, "must be before end date") unless
        self.start_at <= self.end_at
  end

  #Overflow of holidays is validated by calling "validates" L31. Then checks if absent days
  #Is gt or = to length
  def overflow
    errors.add(:overflow, "- You only have #{user.absentdays} days holiday remaining; this absence is #{length} days.") unless
        user.absentdays >= length
  end

  def name
    return self.user.name
  end

  def colors
    if state ||= "denied"
      return self.color ||= "#C00000"

    end
  end

  private

  #Setting default values - before_create is called and sets the following
  def default_values
    self.state ||= "requested"
    self.color ||= "#000000"
    self.type_id||= 1
  end
end

似乎不明白为什么它在开发和生产中都有效，而不是在heroku中。有什么想法吗？

Answer 1

标准SQL字符串使用单引号，双引号用于标识符（例如表名和列名）; PostgreSQL遵循这里的标准，MySQL和SQLite不那么严格，其他数据库做不同严格程度的其他事情。在任何情况下，SQL字符串文字的单引号应该在任何地方都一样。

您在SQL字符串上使用双引号：

@holidays = Holiday.find(:all, :conditions => 'state = "requested"')
#------------------------------------------------------^---------^

你必须单引号：

@holidays = Holiday.find(:all, :conditions => %q{state = 'requested'})

或将其现代化并让ActiveRecord处理引用：

@holidays = Holiday.where(:state => 'requested')

你可能也需要修改这个引用：

@holidays = Holiday.find(:all, :conditions => ["approver_id = #{current_user.id}", "state = requested"])

同样，现代化是最简单的方法：

@holidays = Holiday.where(:approver_id => current_user.id, :state => 'requested')

我猜你在SQLite上开发但在PostgreSQL上部署。这是个坏主意，总是在同一个堆栈上开发和部署。

Heroku - ActiveRecord :: StatementInvalid（PG ::错误：错误：列“请求”不存在

1 个答案: