Question

I’m trying to do update_attributes with Mongoid in a Rails 3 application

The problem I’m running into is this:

Let’s say my collection has the following fields:

{“Name” : “foo”, “email” : “bar” }

Here’s the scenario

if I do this:

@person = Person.where(:Name => "foo", :_id = "some_id")

and then I do this:

@person.update_attributes(:Name => "baba-fooka", :Last_Name => "baba-bara")

The line of code above updates the record in mongodb, but also adds a new field to the document.

How can I use the update_attributes method with a validation which doesn’t allow inserting fields which don’t already exist

Answer 1

It sounds like what you want is allow_dynamic_fields set to false in the mongoid config file. Dynamic fields is on by default which allows attributes to get set and persisted on the document even if a field was not defined for them.

Go into config/mongoid.yml under options set allow_dynamic_fields: false. It should already be there but commented out and set to true. Make sure it says false.