Mastering Doctrine Relationships in Symfony 3

In the part 1 of the Doctrine Tutorial we got a sweet setup with Doctrine: entities, queries, migrations and fixtures.

But, we left out one big piece: database relations. Once you've mastered these, you'll be unstoppable. Unfortunately, a lot of information out there make Doctrine relations look over-complicated. Actually, they're simple and beautiful. Sure, they have some pitfalls - but they'll also help you build a complex data structure in no time.

• ManyToOne relationships (associations)
• The OneToMany side of a relation
• The downfall of owning versus inverse sides of a relation
• Doing magic with the ArrayCollection
• Querying with Joins

... and more - like some magic with the "Param Conversion".

• Create Genus Note
• The King of Relations: ManyToOne
• Saving a Relationship
• JoinColumn & Relations in Fixtures
• Controller Magic: Param Conversion
• OneToMany: Inverse Side of the Relation
• Order By with a OneToMany
• Tricks with ArrayCollection
• Querying on a Relationship
• Query across a JOIN (and Love it)