mongoid 查找 VS 哪里
当我通过 ID 搜索时，我似乎只在 1 个特定模型上遇到此问题，
>> Cart.where(:_id => '4dae5902e1607c232c000009').first
=> #<Cart _id: 4dae5902e1607c232c000009, _id: BSON::ObjectId('4dae5902e1607c232c000009'), _type: nil>
>> Cart.find('4dae5902e1607c232c000009')
Mongoid::Errors::DocumentNotFound: Document not found for class Cart with id(s) 4dae5902e1607c232c000009.
奇怪的是，对于其他模型，我可以使用 find 很好。有什么想法吗？
堆栈的其余部分是...
from /Library/Ruby/Gems/1.8/gems/mongoid-2.0.1/lib/mongoid/criterion/inclusion.rb:192:in `execute_or_raise'
from /Library/Ruby/Gems/1.8/gems/mongoid-2.0.1/lib/mongoid/criterion/inclusion.rb:190:in `tap'
from /Library/Ruby/Gems/1.8/gems/mongoid-2.0.1/lib/mongoid/criterion/inclusion.rb:190:in `execute_or_raise'
from /Library/Ruby/Gems/1.8/gems/mongoid-2.0.1/lib/mongoid/criterion/inclusion.rb:106:in `find'
from /Library/Ruby/Gems/1.8/gems/mongoid-2.0.1/lib/mongoid/finders.rb:67:in `find'
from (irb):37
i seem to only be having this issue with 1 particular model when i am searching by ID
>> Cart.where(:_id => '4dae5902e1607c232c000009').first
=> #<Cart _id: 4dae5902e1607c232c000009, _id: BSON::ObjectId('4dae5902e1607c232c000009'), _type: nil>
>> Cart.find('4dae5902e1607c232c000009')
Mongoid::Errors::DocumentNotFound: Document not found for class Cart with id(s) 4dae5902e1607c232c000009.
the strange thing is that with other models, i can use find just fine. any ideas?
the rest of the stack is...
from /Library/Ruby/Gems/1.8/gems/mongoid-2.0.1/lib/mongoid/criterion/inclusion.rb:192:in `execute_or_raise'
from /Library/Ruby/Gems/1.8/gems/mongoid-2.0.1/lib/mongoid/criterion/inclusion.rb:190:in `tap'
from /Library/Ruby/Gems/1.8/gems/mongoid-2.0.1/lib/mongoid/criterion/inclusion.rb:190:in `execute_or_raise'
from /Library/Ruby/Gems/1.8/gems/mongoid-2.0.1/lib/mongoid/criterion/inclusion.rb:106:in `find'
from /Library/Ruby/Gems/1.8/gems/mongoid-2.0.1/lib/mongoid/finders.rb:67:in `find'
from (irb):37
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通常问题是相反的。失败的地方和有效的地方。
这是由于在查询之前没有将 id 转换为 BSON::ObjectId 造成的。
通常你必须这样做
这让我相信你的 id 存储为字符串而不是 BSON:ObjectId 并且会解释为什么 find 失败（它正在搜索 BSON::ObjectId 而不是字符串）
也可以解释为什么它是只有一种模型，因为它完全取决于对象的存储方式。
希望有帮助
Normally the issue is the other way around. With the where failing and the find working.
That is cause by where not casting the id into BSON::ObjectId before the query.
Usually you would have to do this
This leads me to believe that your ids are stored as strings and not BSON:ObjectId and would explain why find fails ( it is searching for a BSON::ObjectId not a string)
Could also explain why it is only one model as it depends entirely on how the objects are stored.
Hope that helps