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When one retrieves a Rails model object, how are the column (or object attribute) names accessed?
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Columns attribute of the dataframe returns the column labels of the dataframe. You can get the column names as an array by using the . columns. values property of the dataframe.
What is ActiveRecord? ActiveRecord is an ORM. It's a layer of Ruby code that runs between your database and your logic code. When you need to make changes to the database, you'll write Ruby code, and then run "migrations" which makes the actual changes to the database.
Now ApplicationRecord will be a single point of entry for all the customizations and extensions needed for an application, instead of monkey patching ActiveRecord::Base. Say I want to add some extra functionality to Active Record. This is what I would do in Rails 4.2.
Active Record uses naming conventions for the columns in database tables, depending on the purpose of these columns. Foreign keys - These fields should be named following the pattern singularized_table_name_id (e.g., item_id , order_id ).
User.column_names Like a lot of things in Rails, it just works :)
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Example:
user = User.find(1) p user.attributes.keys If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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