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Search for a dynamic field in a mongodb collection

Ask Time：2015-02-05T05:04:25         Author：user3799658

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If I were to search for a particular field in a mongodb collection my command would look something like this : 

db.collection.find({ name : "John"})

If I want to make the field name dynamic, what would the command be?

Example: 

db.collection.find({ <Dyanmic field variable> : <Value>})

Or is there an alternative to achieve this function?

Author:user3799658，eproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/28331408/search-for-a-dynamic-field-in-a-mongodb-collection
alecxe :
Just use the variable in place of the dictionary key:\n\nname = 'field_name'\ndb.collection.find({name : \"John\"})\n",
2015-02-04T21:25:24

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