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Yes if you have one MongoDB database that uses `title` and another one that uses `post_title` then you have to adjust your code for that.

Guess what. Same thing applies to SQL.

In SQL you can't have a table whose title field is called either `title` or `post_title` depending on which record you're looking at.

You easily could have this in SQL if you designed a poor schema or failed to migrate data from the previous field name.