remove_column
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remove_column(table_name, column_name, type = nil, **options)
public
Removes the column from the table definition.
remove_column(:suppliers, :qualification)
The type and options parameters will be ignored if present. It can be helpful to provide these in a migration’s change method so it can be reverted. In that case, type and options will be used by #add_column. Depending on the database you’re using, indexes using this column may be automatically removed or modified to remove this column from the index.
If the options provided include an if_exists key, it will be used to check if the column does not exist. This will silently ignore the migration rather than raising if the column was already used.
remove_column(:suppliers, :qualification, if_exists: true)