timestamps creates created_at field.
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The `t.timestamps`, available since Rails 2.3, already creates the `created_at` column. Therefore, since Rails 6.0+ the test suite fails with the following error: ~~~ /usr/share/gems/gems/activerecord-6.0.3.2/lib/active_record/connection_adapters/abstract/schema_definitions.rb:372:in `column': you can't define an already defined column 'created_at'. (ArgumentError) from /usr/share/gems/gems/activerecord-6.0.3.2/lib/active_record/connection_adapters/abstract/schema_definitions.rb:411:in `timestamps' from /builddir/build/BUILD/test/helper.rb:114:in `block (2 levels) in <top (required)>' ~~~
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The
t.timestamps, available since Rails 2.3, already creates thecreated_atcolumn. Therefore, since Rails 6.0+ the test suite fails with the following error: