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    Default MongoDB Input with param of other input

    I'm have two inputs some one on MySql database and other on MongoDb, I kind of sample input. With results of mysql select I want to select some data on mongo, but when I try to use the result of mysql as parameter on mongo I receive this message: "Query contains unresolved variables or field substitutions" I'm doing this query on Mongo Input:
    HTML Code:
    {${field}: {"${exists}": true}}
    The field is listed on input fields on mongodb input, and I'm try to use "?" instead ${field}, but get "Sorry, no rows found to be previewed."

    By the way I'm using 7.1 version.
    Thanks for your attention.
    Last edited by williamespindola; 11-06-2017 at 08:14 PM.

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