使用omniauth的rails项目-卡在评估nil.[]错误上
我在我的 Rails 项目上使用omniauth 来通过facebook 进行身份验证。
我还尝试从omniauth 获取用户当前的城市，当用户在facebook 中拥有当前的城市时，这效果很好。
额外的： 用户哈希： 姓名：杰夫·特纳 地点： 名称：加利福尼亚州奥克兰，
但是当用户没有任何内容时，我无法设置该值
current_city = user_data['location']['name']
错误： 当你没有预料到的时候，你得到了一个 nil 对象！ 您可能期望一个 ActiveRecord::Base 的实例。 评估 nil 时发生错误。[]
这些属性甚至没有从omniauth 返回任何值，
我可以看到，如果我尝试测试 nil 条件，
if user_data['location']['name'].blank? == false
current_city = user_data['location']['name']
end
我似乎在第一行 (user_data[ 'location']['name'].blank？）
仍然无法评估nil。
我对 Rails 还很陌生，所以我希望我错过了一些明显的东西。
更新
这就是我最终将其更改为的内容，并且效果很好。下面的答案看起来也可以
if user_data['location'].nil? == false
if user_data['location']['name'].nil? == false
current_city = user_data['location']['name']
end
end
I am using omniauth on my rails project to authenticate with facebook.
I am also trying to get the user's current city from omniauth, and that works great when the user has their current city in facebook.
extra:
user_hash:
name: Jeff Turner
location:
name: Oakland, California
but when the user doesn't have anything, I cant set that value
current_city = user_data['location']['name']
error:
You have a nil object when you didn't expect it!
You might have expected an instance of ActiveRecord::Base.
The error occurred while evaluating nil.[]
I can see that no value with those attributes even come back from omniauth
if I try to test for the nil condition
if user_data['location']['name'].blank? == false
current_city = user_data['location']['name']
end
I seem to get the same error on that first line (user_data['location']['name'].blank?)
still cant evaluate nil.
I am pretty new to rails, so I hope I just missed something obvious.
Update
this is what I ended up changing it to and it worked fine. answer below looks like it would work as well
if user_data['location'].nil? == false
if user_data['location']['name'].nil? == false
current_city = user_data['location']['name']
end
end
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您可以尝试执行以下操作：
使用 fetch< /a>.
You can try doing something like this:
Using fetch.