I want to know if there is any array method to check existence of particular column in model. I have combined query results from two tables into an array. I need to check exitence of those tables column name inj that array.
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- Please be a bit more elaborate. Your question is not clear enough.Shreyas– Shreyas2010-11-10 10:46:18 +00:00Commented Nov 10, 2010 at 10:46
- Duplicate of How to check if a model has a certain column/attribute? that has better question and answers.Marc-André Lafortune– Marc-André Lafortune2012-07-19 16:49:34 +00:00Commented Jul 19, 2012 at 16:49
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4 Answers
Model.columns.map(&:name).include?("id") # => true Model.columns.map(&:name).include?("not_available_column") # => false 
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Another, perhaps cleaner way of doing this is: Foo.column_names.include?("bar")
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This is how you can check if a model instance is of a particular class, eg obj.is_a?(Person).
To see which columns a certain model has, you do it at class level: obj.class.columns.collect { |c| c.name }.
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jordinl
even shorter: obj.class.columns.map(&:name)
You could use this also:
ActiveRecord::Base.connection.column_exists?(:users, :id) 