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Accessing column information with ActiveRecord

A quick tip - ActiveRecord provides a number of methods that allow you to access information about the underlying table columns for a model.

Returns an array of Column objects.
Similar to the columns method but returns a Hash using column names as keys and Column objects as values.
Returns a simple array of column names for the model.

The Column objects returned by columns and columns_hash can then be used to get information such as the data type and default values, for example:

=> :string
=> nil
=> "varchar(255)"
Updated on 16 July 2015
First published by Chris Anderton on 14 April 2009
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"Accessing column information with ActiveRecord" by Chris Anderton at TheWebFellas is licensed under a Creative Commons Attribution 4.0 International License.