Archive for September 16, 2015

MongoDB Document Validation – London MUG charts

Defining MongoDB Document Validation Rules

Last night I preented on the MongoDB 3.2 Documentation Validation feature at the London MongoDB User Group meetup; the charts are shared here. Unfortunately, I didn’t record the demo and so you’ll have to grab me at a future MUG if you’d like to see that!


One of MongoDB’s primary appeals to developers is that it gives them the ability to start application development without needing to define a formal, up-front schema. Operations teams appreciate the fact that they don’t need to perform a time-consuming schema upgrade operation every time the developers need to store a different attribute (as an example, The Weather Channel is now able to launch new features in hours whereas it used to take weeks). For business leaders, the application gets launched much faster, and new features can be rolled out more frequently. MongoDB powers agility.

Some projects reach a point where it’s necessary to define rules on what’s being stored in the database – for example, that for any document in a particular collection, you can be assured that certain attributes are present.

To address the challenges discussed above, while at the same time maintaining the benefits of a dynamic schema, MongoDB 3.2 introduces document validation.

There is significant flexibility to customize which parts of the documents are and are not validated for any collection.

Please feel free to ask any questions through comments on this post.