method
primary_key

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Class: ColumnMethods
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primary_key(name, type = :primary_key, **options)
public
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# File activerecord/lib/active_record/connection_adapters/sqlite3/schema_definitions.rb, line 5 def primary_key(name, type = :primary_key, **options) if %(integer bigint).include?(type) && (options.delete(:auto_increment) == true || !options.key?(:default)) type = :primary_key end super end