I saw old reference (3 years ago) to OneToMany Unidirectional (foreign key) not being implemented:
https://groups.google.com/d/msg/doctrine-user/y8du6cafhdA/QnY_h8NjD10J
I don't see it in current documentation and have also tried using JPA 2.0 onetomany unidirectional annotations and they don't work on Doctrine 2.3.3.
So can I assume OneToMany Unidirectional is still not implemented?
OneToMany Unidirectional is still not implemented as of Doctrine 2.3.3. I base this on the following response from Doctrine User Google Group:
https://groups.google.com/forum/#!topic/doctrine-user/rXLvbhbBXj0
Related
I have this kind of relationship in the database as follows, which I even don't know how to name:
Doctrine generates 3 entities, which is right, creates proper mappings for t1-t2 relation, but then uses nonexisting entity t1_has_t2 for t3-t3_has_t1_has_t2 relation. Is there a way to implement this kind of relationship in Doctrine without turning t1_has_t2 into useless entity.
I suppose the answer is no but I am asking to be sure.
SensioGeneratorBundle contains a command to generate entities. Do you know if it can generate the mappings for a one2Many or Many2Many field? Is there any project that implements this?
The only example I found:
php app/console doctrine:generate:entity --entity=AcmeBlogBundle:Blog/Post --format=annotation --fields="title:string(255) body:text" --with-repository --no-interaction
Many thanks
I know this is old... but this could help some people.
Here is a Symfony3 bundle that can generate Doctrine 2 associations, including a one-to-many relationship:
https://github.com/Remg/GeneratorBundle
Associations
Handles all Doctrine2 association types (OneToOne, OneToMany, ManyToOne, ManyToMany).
Handles unidirectional and bidirectional associations.
AFAIK the answer is no. I have already asked a similar question and it seems that there is no free tool that can do that. But if you want to pay : http://www.orm-designer.com/
There is a workaround that makes the job perfectly, without any additional software or bundle to install.
You just have to edit the DatabaseDriver.php from doctrine like described here :
Symfony2 Doctrine2 - generate One-To-Many annotation from existing database by doctrine:mapping:import
I have two entities related with many to one relation but each one belongs to a bundle.
When forcing the update in the database I get the following error
the target -entity cannot xxxx\Bundle1\Entity be found in xxxx\bundle2\entity
Any ideas please??
Just create an entity extending xxxx\Bundle1\Entity in your xxxx\bundle2 and make the relationship between two xxxx\bundle2 entities.
i ran into the following problem and after hours of searching on the web i don't find any solution.
I want to have a "3-Entity Relationship" between the Entity Project, User and Role.
A Project have many users, and a User can be member of many projects. But in every Relationship between Project <--> User the User can have a different Role.
How can i solve this with Doctrine2?
Many thanks in advance!
EDIT
An little codeexample would be very nice :)
You should have an N:M association between Project and User. Then every instance of this association has the role property (either as an integer for a fixed list, or as an association to a Role entity). Doctrine unfortunately does not explicitly support properties on associations, so in these cases you should use connector entities: an entity that is in ManyToOne connection to both Project and User. This entity then can hold the role value(s)/association(s), but you have to manage (dis)connecting through these objects.
I am in the process of upgrading from Doctrine 1.1.4 to Doctrine 2.0.6 in my Zend application.
Currently, I am working on mapping the associations between entities. In Doctrine 2's Documentation it says 'relationships maybe bidirectional or unidirectional. I am confused as to what these terms mean within the given context.
How do I determine if a relationship is unidirectional or bidirectional?
Appreciate the help.
A relationship is bidirectional if both entities contain a reference to the other.
If you omit one of those references, it's unidirectional.
Consider a typical "posts" and "tags" schema. Typically, you'd implement a bidirectional association:
<?php
class Post {
// ...
/**
* #ManyToMany(targetEntity="Tag",inversedBy="posts")
*/
protected $tags;
// ...
}
class Tag {
// ...
/**
* #ManyToMany(targetEntity="Post",mappedBy="tags")
*/
protected $posts
// ...
}
Now, imagine you decided you never (or rarely) needed to answer questions like "Which posts have Tag 'foo'?". You could omit the $posts association in your Tag entity, converting it to a unidirectional association, and take some load off of the ORM.
You could still answer that kind of question, but you'd have to write code to do it.
In fact, it's probably a good way to go in Posts/Tags scenario, as you wouldn't typically be adding/removing Posts from Tags. Typically, you'd add/remove tags from posts only. You'd only ever go from Tags to Posts when looking for "all posts with tag 'x'", which could be trivially implemented in a service class of some sort.
Same as timdev`s answer,
Unidirectional & BiDirectional is just ORM Concepts, these have nothing to do with database,
Suppose you have a OneToMany relation -
user has blogs
So you can add this to your User Entity as OneToMany Property
but obviously there exisits ManyToOne Relation
Blogs Has User
so it is optional for you to create a ManyToOne relation in your Blog Entity, If you want to access user from blog entity then add this property if you dont want then dont add,its not necessary. in both Cases (you are adding bidirectional reference or not) ORM will maintain same database structure (blog table will have user_id column) .