Firebase安全规则涉及.getPriority（）问题 [英] Trouble with Firebase security rule involving .getPriority()

问题描述

我试图让用户用ref.setPriority（priority）来设置一个项目的优先级，但是我也想确保它们不能设置成小于current_priority -10。

但是这个表达式：

pre $ 。write：data.getPriority（） - newData.getPriority（）> 10


给我一​​个错误表达式：左操作数不是数字。

然而：

$ p $ data $ get_priority（）。length - newData .getPriority（）。length> = 1

当我尝试设置优先级时，权限被拒绝）

Firebase是否假设优先级不是数字？如果是的话，有没有办法解决这个问题？

编辑：我将从Firebase的实际JSON添加一个项目：

 http_www_latimes_com_local_lanow_la_me_ln_two_police_officers_shot_in_inglewood_20131127_0_1591070_story_track_rss：{
.priority：4458.0，
date：1385616825，
url： http://www.latimes.com/local/lanow/la-me-ln-two-police-officers-shot-in-inglewood-20131127,0,1591070.story，
讨论： http://www.reddit.com/r/news/comments/1rlmzy/two_inglewood_police_officers_shot_active_shooter/，
small_image：http://i.embed.ly/1/display/resize?height= 168.75和放大器; WIDTH = 300安培; URL = HTTP％3A％2F％2Fwww.trbimg.com％2Fimg-529660a6％2Fturbine％2Fla-ME-LN-两个警察人员 - 射中 - 英格伍德-20131127％2F400％2F16x9和放大器; key = 6b62489a749d11e1b62e4040d3dc5c07，
title：两名英格尔伍德警察枪杀，主动射手在地区，
身高：168.75，
desc：被星期三击中英格伍德警方官员说：
width：300，
id：http_www_latimes_com_local_lanow_la_me_ln_two_police_officers_shot_in_inglewood_20131127_0_1591070_story_track_rss
}，
  

所以也许它应该是'root.getPriority（）'，我不确定。

解决方案

看起来像我们的规则验证有一个错误。你试过的表达式（data.getPriority（） - newData.getPriority（）> 10）应该是合法的，做你想做的事情，但是它现在被错误地拒绝了。我们已经做好了解决方案，但直到下周某个时候才能投入生产。不便之处！

I'm trying to let user set the priority of an item with "ref.setPriority(priority);" but I also want to make sure they can't set it to less than "current_priority -10".

But this expression:

".write": "data.getPriority() - newData.getPriority() > 10"

is giving me an error "expression: left operand is not a number".

However:

data.getPriority().length - newData.getPriority().length >=1

Sort of works (no errors on saving but gives me 'permission denied' when I try to set the priority)

Does Firebase assume the priority is not a number? If so, is there a way to get around that?

EDIT: I'll add the actual JSON from Firebase for one item:

"http_www_latimes_com_local_lanow_la_me_ln_two_police_officers_shot_in_inglewood_20131127_0_1591070_story_track_rss" : {
  ".priority" : 4458.0,
  "date" : 1385616825,
  "url" : "http://www.latimes.com/local/lanow/la-me-ln-two-police-officers-shot-in-inglewood-20131127,0,1591070.story",
  "discuss" : "http://www.reddit.com/r/news/comments/1rlmzy/two_inglewood_police_officers_shot_active_shooter/",
  "small_image" : "http://i.embed.ly/1/display/resize?height=168.75&width=300&url=http%3A%2F%2Fwww.trbimg.com%2Fimg-529660a6%2Fturbine%2Fla-me-ln-two-police-officers-shot-in-inglewood-20131127%2F400%2F16x9&key=6b62489a749d11e1b62e4040d3dc5c07",
  "title" : "Two Inglewood police officers shot; active shooter in area",
  "height" : 168.75,
  "desc" : "Two Inglewood police officers were shot Wednesday afternoon and taken to a local hospital, Inglewood police officials said.",
  "width" : 300,
  "id" : "http_www_latimes_com_local_lanow_la_me_ln_two_police_officers_shot_in_inglewood_20131127_0_1591070_story_track_rss"
},

so maybe it should be 'root.getPriority()', I'm not sure.

解决方案

Looks like there's a bug in our rules validation. The expression you tried ("data.getPriority() - newData.getPriority() > 10") should be legal and do what you want, but it's currently being incorrectly rejected. We've made a fix, but it won't go live to production until sometime next week. Sorry for the inconvenience!

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