Hi All,

Here is an example from the doc:

items.filter(:category => 'ruby').sql
  #=> "SELECT * FROM items WHERE (category = 'ruby')"


What if I don't know my column name until at runtime.
How would I replace :category by a dynamic column. For example:
like :name or :email

I understand that I can use custom string. I wonder if there's a way
to do dynamic with hash value.

Thanks,
Luan

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