如何在不使用eval的情况下将字符串转换为ruby / rails中的散列? [英] How to convert a string to a hash in ruby/rails without using eval?
问题描述
以下是需要转换为散列
的字符串
。
Here is the string
which needs to convert into a hash
.
"{:status => {:label => 'Status', :collection => return_misc_definitions('project_status') } }"
我们不能使用 eval $ c $因为
eval
将在字符串中执行方法 return_misc_definitions('project_status')
。是否有纯字符串操作来完成ruby / rails中的这种转换?感谢您的帮助。
We can not use eval
because eval
will execute the method return_misc_definitions('project_status')
in the string. Is there pure string operation to accomplish this conversion in ruby/rails? Thanks for help.
推荐答案
如前所述,您应该使用 eval
。你关于 eval
执行 return_misc_definitions
的观点没有意义。它将以任一方式执行。
As mentioned earlier, you should use eval
. Your point about eval
executing return_misc_definitions
doesn't make sense. It will be executed either way.
h1 = {:status => {:label => 'Status', :collection => return_misc_definitions('project_status') } }
# or
h2 = eval("{:status => {:label => 'Status', :collection => return_misc_definitions('project_status') } }")
这两行之间没有功能上的区别,它们产生的结果完全相同。 / p>
There's no functional difference between these two lines, they produce exactly the same result.
h1 == h2 # => true
当然,如果可以的话,不要使用ruby散列的字符串表示。使用JSON或YAML。他们更安全(不要求 eval
)。
Of course, if you can, don't use string represenstation of ruby hashes. Use JSON or YAML. They're much safer (don't require eval
).
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