‘‘Magic’’ Timestamp Columns in Rails

Rails does magic with datetime columns, if they’re named a certain way. Active Record will automatically timestamp create operations if the table has columns named created_at or created_on. The same applies to updates when there are columns named updated_at or updated_on.
Note that created_at and updated_at should be defined as datetime, but if you use t.timestamps then you don’t have to worry about what type of columns they are.
Automatic timestamping can be turned off globally, by setting the following variable in an initializer.
ActiveRecord::Base.record_timestamps = false
The preceding code turns off timestamps for all models, but record_timestamps is class-inheritable, so you can also do it on a case-by-case basis by setting self.record_timestamps to false at the top of specific model classes.

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