How to add a constraint index in yaml Doctrine 2 - doctrine-orm

Question

I`ve got two tables described in YAML.
For example :
Entities\User:
type: entity
table: users
id:
id:
type: integer
generator:
strategy: AUTO
fields:
username:
type: string
length: 64
oneToMany:
children:
targetEntity: UserToUser
mappedBy: parent
parents:
targetEntity: UserToUser
mappedBy: child
Entities\UserToUser:
type: entity
table: user_to_user
id:
id:
type: integer
generator:
strategy: AUTO
fields:
user_id:
type: integer
nullable: false
child_id:
type: integer
nullable: false
manyToOne:
parent:
targetEntity: User
inversedBy: children
joinColumn:
name: user_id
referencedColumnName: id
child:
targetEntity: User
inversedBy: parents
joinColumn:
name: child_id
referencedColumnName: id
in this case everything generates well but in fact in database in table user_to_user there in no unique index for fields: user_id and child_id.
So there is the possibility to add 2 entries with the same value.
I was trying to add constraints
uniqueConstraints:
child_user_idx:
columns: child_id,user_id
or 2 other ways:
id:
user_id:
type: integer
child_id:
type: integer
or
id:
parent:
associationKey: true
child:
associationKey: true
Trying to combine these options but as the result using doctrine console validation, there were errors every time but generated SQL was exactly what I needed.
One of them for example:
The join columns of the association parent have to match to ALL identifier columns of the source entity Entities\UserToUser, however, child_id is missing.
The join columns of the association child have to match to ALL identifier columns of the source entity Entities\UserToUser, however, user_id is missing.
I do not really understand what I have to add so the validation pass correctly

Answer 1

While using YAML you can try to use the following notation:
Vendor\CategoryBundle\Entity\Category:
type: entity
table: category
indexes:
# the name of the index
category_slug_idx:
# Columns is an array, specify multiple columns for
# a compound index
columns: [ slug ]
id:
id:
type: integer
generator: { strategy: AUTO }
fields:
name:
type: string
slug:
type: string
you can see that you can declare the indexes under the indexes: node

Answer 2

I think this is what you are looking for https://gist.github.com/1845982
Vendor\BlogBundle\Entity\BlogImage:
type: entity
table: blog_image
# use two fields for our identifier
id:
blog:
# flag as an association key
associationKey: true
image:
associationKey: true
fields:
caption:
type: string
# Specify our relationships for above
manyToOne:
project:
targetEntity: Vendor\BlogBundle\Entity\Blog
inversedBy: images
oneToOne:
image:
targetEntity: Vendor\ImageBundle\Entity\Image