扶手：＆QUOT;堆栈层次过深＆QUOT;调用和当错误QUOT; ID＆QUOT;主键的方法 [英] Rails: "Stack level too deep" error when calling "id" primary key method

问题描述

这是<一个一个重新发布href="http://stackoverflow.com/questions/4130829/each-map-on-array-results-in-you-have-a-nil-object-when-you-didnt-expect-it">another发行，更好地孤立这个时候。 在我的environment.rb文件中我改变了这一行：

This is a repost on another issue, better isolated this time. In my environment.rb file I changed this line:

config.time_zone = 'UTC'

这一行：

config.active_record.default_timezone = :utc

于是乎，这个调用：

Ever since, this call:

Category.find(1).subcategories.map(&:id)

这是运行在开发环境中的第二次失败后的堆栈级别太深错误时config.cache_classes = FALSE。如果config.cache_classes =真，不会出现问题。 该错误是下面的code在active_record / attribute_methods.rb围绕线252结果：

Fails on "Stack level too deep" error after the second time it is run in the development environment when config.cache_classes = false. If config.cache_classes = true, the problem does not occur. The error is a result of the following code in active_record/attribute_methods.rb around line 252:

def method_missing(method_id, *args, &block)
...

    if self.class.primary_key.to_s == method_name
        id
    ....

要在ID功能重新呼叫的呼叫使用method_missing并没有什么prevents的ID被称为一遍又一遍，造成堆栈层次过深。

The call to the "id" function re-calls method_missing and there is nothing that prevents the id to be called over and over again, resulting in stack level too deep.

我用Rails 2.3.8。 该分类模型的has_many：子类别。 该行上的上述变体的呼叫失败（例如Category.first.subcategory_ids，使用每个而不是地图，等）。

I'm using Rails 2.3.8. The Category model has_many :subcategories. The call fails on variants of that line above (e.g. Category.first.subcategory_ids, use of "each" instead of "map", etc.).

有什么想法就会有强烈的AP preciated。

Any thoughts will be highly appreciated.

谢谢！ 阿米特

推荐答案

- 这个答案是从我原来的职位复制<一href="http://stackoverflow.com/questions/4130829/each-map-on-array-results-in-you-have-a-nil-object-when-you-didnt-expect-it">here.

-- This answer is copied from my original post here.

终于解决了！ 发布后第三个问题并用的trptcolin ，我可以确认工作的解决方案。

Finally solved! After posting a third question and with help of trptcolin, I could confirm a working solution.

问题：我用要求来包括模型从表少模型（类是在app /模型，但不延长的ActiveRecord :: Base的）之内。例如，我有一个类 FilterCategory 的实施需要类别。这搞砸了Rails的类缓存。 我不得不使用要求摆在首位，因为线，如 Category.find：所有失败

The problem: I was using require to include models from within Table-less models (classes that are in app/models but do not extend ActiveRecord::Base). For example, I had a class FilterCategory that performed require 'category'. This messed up with Rails' class caching. I had to use require in the first place since lines such as Category.find :all failed.

解决方案（归功于trptcolin）：替换 Category.find：所有与 :: Category.find：所有。这工作，而不需要明确要求的任何模型，并且因此不会导致任何类缓存问题

The solution (credit goes to trptcolin): replace Category.find :all with ::Category.find :all. This works without the need to explicitly require any model, and therefore doesn't cause any class caching problems.

协议栈太深的问题也消失在使用 config.active_record.default_timezone =：UTC

The "stack too deep" problem also goes away when using config.active_record.default_timezone = :utc

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