CODEWITHSUNDEEP
azure-data-factory
Martin
Martin

Reputation: 183

Expression invalid

Azure Data Factory error: 

The expression 'item().$v.collection.$v' cannot be evaluated because property '$v' doesn't exist, available properties are '$t, $v._id.$t, $v._id.$v, $v.id.$t, $v.id.$v, $v.database.$t, $v.database.$v, $v.collection.$t, $v.collection.$v, id, _self, _etag, _rid, _attachments, _ts'

How can I get around that ? I am using this expression in forEach which is connected to lookup activity which is reading values from CosmosDB. I am interested only in single column, but SQL: 

select collection from backups

didn't work, hence I switched from "Query" to "Table", hence output of lookup activity contains json object with fields containing $

Upvotes: 0

Views: 543

Answers (1)

Wang Zhang
Wang Zhang

Reputation: 327

this error results from for each activity treats "." as the property accessor, please use the expression "@item()['$v.collection.$v']" to get around the error. Thanks.

Upvotes: 2

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