Collection Serialized into a Single Column

Serializing a collection of Value Objects into a single column is most likely the easiest solution. Everything that was previously explained in the section about persisting a single Value Object applies in this situation. With Doctrine, you can use an Object or Custom Type — with some additional considerations to bear in mind: Value Objects should be small in size, but if you wish to persist a large collection, be sure to consider the maximum column length and the maximum row width that your database engine can handle.