Symfony2 Doctrine2 trouble with optional one to one relation

Question

I have a problem with Doctrine2 in Symfony2 and two relationed entities.

There is a user-entity that can (not must) have a usermeta-entity referenced which

Answer 1

The Zdenek Machek comment is almost correct. As you can see from the Doctrine2 documentation, the nullable option should be in the join annotation (@JoinColumn), not in the mapping one (@OneToOne).

@JoinColumn doc:

This annotation is used in the context of relations in @ManyToOne, @OneToOne fields and in the Context of @JoinTable nested inside a @ManyToMany. This annotation is not required. If its not specified the attributes name and referencedColumnName are inferred from the table and primary key names.

Required attributes:

name: Column name that holds the foreign key identifier for this relation. In the context of @JoinTable it specifies the column name in the join table.

referencedColumnName: Name of the primary key identifier that is used for joining of this relation.

Optional attributes:

unique: Determines if this relation exclusive between the affected entities and should be enforced so on the database constraint level. Defaults to false.

nullable: Determine if the related entity is required, or if null is an allowed state for the relation. Defaults to true.

onDelete: Cascade Action (Database-level)

onUpdate: Cascade Action (Database-level)

columnDefinition: DDL SQL snippet that starts after the column name and specifies the complete (non-portable!) column definition. This attribute allows to make use of advanced RMDBS features. Using this attribute on @JoinColumn is necessary if you need slightly different column definitions for joining columns, for example regarding NULL/NOT NULL defaults. However by default a “columnDefinition” attribute on @Column also sets the related @JoinColumn’s columnDefinition. This is necessary to make foreign keys work.

http://doctrine-orm.readthedocs.org/en/latest/reference/annotations-reference.html#annref-joincolumn

@OneToOne doc:

The @OneToOne annotation works almost exactly as the @ManyToOne with one additional option that can be specified. The configuration defaults for @JoinColumn using the target entity table and primary key column names apply here too.

Required attributes:

targetEntity: FQCN of the referenced target entity. Can be the unqualified class name if both classes are in the same namespace. IMPORTANT: No leading backslash!

Optional attributes:

cascade: Cascade Option

fetch: One of LAZY or EAGER

orphanRemoval: Boolean that specifies if orphans, inverse OneToOne entities that are not connected to any owning instance, should be removed by Doctrine. Defaults to false.

inversedBy: The inversedBy attribute designates the field in the entity that is the inverse side of the relationship.

http://doctrine-orm.readthedocs.org/en/latest/reference/annotations-reference.html#onetoone