![Aggregation how to merge content from two schemas - Node.js Frameworks - MongoDB Developer Community Forums Aggregation how to merge content from two schemas - Node.js Frameworks - MongoDB Developer Community Forums](https://www.mongodb.com/community/forums/uploads/default/original/3X/7/a/7a521e916c46b7d89f4dd11c654cc46b246d430f.png)
Aggregation how to merge content from two schemas - Node.js Frameworks - MongoDB Developer Community Forums
![mongodb - Invalid Reference $$this for mongo array reduce arithmetic operation in java - Stack Overflow mongodb - Invalid Reference $$this for mongo array reduce arithmetic operation in java - Stack Overflow](https://i.stack.imgur.com/qVG4v.png)
mongodb - Invalid Reference $$this for mongo array reduce arithmetic operation in java - Stack Overflow
![Azure Data Factory (ADF) Dynamic content as field mapping to MongoDB from Azure Blob Storage: Error code: Expression of type: 'String' does not match the field: 'mappingV2' : r/AZURE Azure Data Factory (ADF) Dynamic content as field mapping to MongoDB from Azure Blob Storage: Error code: Expression of type: 'String' does not match the field: 'mappingV2' : r/AZURE](https://preview.redd.it/lg8j1q7wblp91.png?width=1570&format=png&auto=webp&s=2efa1bce49d11d89c6d706b931a2cadd84fc0ef4)
Azure Data Factory (ADF) Dynamic content as field mapping to MongoDB from Azure Blob Storage: Error code: Expression of type: 'String' does not match the field: 'mappingV2' : r/AZURE
![split error message: requires an expression that evaluates to a string - Working with Data - MongoDB Developer Community Forums split error message: requires an expression that evaluates to a string - Working with Data - MongoDB Developer Community Forums](https://www.mongodb.com/community/forums/uploads/default/original/2X/1/183cb327b15330e8c92cad30a127493a895c4141.png)