Sure. That would be in cases were you can clean up your data in the controller or use database default values. For instance, if I have an article model with a boolean datatype for the published value, and I am using a before_validation to set the default value of false if its nil, that is a wrong use of callbacks even if it works. You could have easily set a default value when creating that database column since we know it's always going to be false until the creator of the article decides to publish it.
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Sure. That would be in cases were you can clean up your data in the controller or use database default values. For instance, if I have an article model with a boolean datatype for the published value, and I am using a
before_validationto set the default value offalseif its nil, that is a wrong use of callbacks even if it works. You could have easily set a default value when creating that database column since we know it's always going to be false until the creator of the article decides to publish it.