Как удалить столбцы с рельсов
rails generate migration RemoveFieldNameFromTableName field_name:datatype
remove_column :table_name, :column_name
Bright Beaver
rails generate migration RemoveFieldNameFromTableName field_name:datatype
remove_column :table_name, :column_nameclass RemoveCountryFromSampleApps < ActiveRecord::Migration[5.0]
def change
remove_column :sample_apps, :country, :string
end
end