Mastering Flask Web Development - Second Edition

Update

To update objects, the update method is called on the results of a query, as follows:

>>> Post.objects(
        id="5534451d8b84ebf422c2e4c8"
).update(text="Ipsum lorem")

If your query should only return one value, then use update_one to only modify the first result, as follows:

>>> Post.objects(
        id="5534451d8b84ebf422c2e4c8"
).update_one(text="Ipsum lorem")

Unlike traditional SQL, there are many different ways to change a value in MongoDB. Operators are used to change the values of a field in the following different ways:

• set: Sets a value (same as given earlier)
• unset: Deletes a value and removes the key
• inc: Increments a value
• dec: Decrements a value
• push: Appends a value to a list
• push_all: Appends several values to a list
• pop: Removes ...