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# rails g migration sample_name_change_column_type
def change
change_column(:table_name, :column_name, :new_type)
end
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def change
change_column(:table_name, :column_name, :new_type)
end
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change_column(:table_name, :column_name, :date)
# a few more examples:
change_column(:suppliers, :name, :string, limit: 80)
change_column(:accounts, :description, :text)