How to find out the type of a model's attribute
When you want to find out the data type of an attribute, you can just use ActiveRecord's columns_hash method.
It returns a hash of column objects that include a type attribute (and more database-related information).
Example:
Contract.columns_hash['id'].type
=> :integer
Contract.columns_hash['active'].type
=> :boolean
Contract.columns_hash['updated_at'].type
=> :datetime
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