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This answer to Rails: Force empty string to NULL in the database suggests using a mixin to set empty string column values to nil.

Is there a way to test if the column accepts nil/null values? 

> f = Foobar.find(1)
=> #<Entity id: 7, name: "foo", description: nil, has_bar: false, created_at: "2014-08-04 21:50:42", updated_at: "2014-08-05 19:35:33">

> f.has_bar.allow_nil?
NoMethodError: undefined method `allow_nil?' for nil:NilClass

I want to ensure that the description field is nil not a blank string, but ensure that has_bar is either true or false.

Excerpt from other question:

attributes.each do |column, value|
  # invalid syntax
  ( self[column].present? && self[column].allow_nil? ) || self[column] = nil
end
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craig
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1 Answers1

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f.description.nil? && (f.has_bar == true || f.has_bar == false)
Weston Ganger
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