Field undefined fails to update to null with mongoid ODM

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Hi!

I am am using mongoid ODM to create and update my data. If I create a document with one field not persisted, this field will be considered undefined ($exists: false). However, If I update this field with nil (null value for rails), it won’t be always updated to null in mongoDB, but stays undefined. I wonder why it behaves like that, and can I update the field to null from mongoid?

Thanks a lot.

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Hi @Xinying_Hu, sorry for the delay in responding, but can you share short code example to illustrate what you mean? This would help us answer you better.