CakePHP: self-referencing HABTM associations? - cakephp

I want to create HABTM self-associations. That is, Users can be associated with other users. The problem is this: I can save associations from one User to another, but I can only view and edit those associations one way. Here's my association:
'Partner' => array(
'className' => 'User',
'joinTable' => 'players_trainers',
'associationForeignKey' => 'player_id',
'foreignKey' => 'trainer_id',
'unique' => true
)
So when I call a User (who is a trainer) I can see the players that are associated with them. No sweat. But when trying to view/edit associations from the other end (to see which trainers a player has been associated with) nothing appears, because the association is treating every User the same way: expecting to associate from a trainer, to a player.
I thought about doing an on-the-fly binding in my controller (based on user role) but that seems hacky.
Is there a clean way to have a HABTM self-association, without having to add new fields to my model? What am I doing wrong?

Try setting up the other association.
var $hasAndBelongsToMany = array(
'Partner' => array(
'className' => 'User',
'joinTable' => 'players_trainers',
'associationForeignKey' => 'player_id',
'foreignKey' => 'trainer_id',
'unique' => true
),
'Trainer' => array(
'className' => 'User',
'joinTable' => 'players_trainers',
'associatedForeignKey' => 'trainer_id',
'foreignKey' => 'player_id',
'unique' => true
)
);

Related

Duplicate model along with it's associations

I came across this post that gave an answer on how to do this but it's not quite working for me.
I have a model called SitePage which has many SitePageGroup which in turn has many SitePageContent
// SitePage Model
public $hasMany = array(
'SitePageGroup' => array(
'className' => 'FoCMS.SitePageGroup',
'foreignKey' => 'site_page_id',
'dependent' => FALSE,
),
);
// SitePageGroup Model
public $belongsTo = array(
'SitePage' => array(
'className' => 'FoCMS.SitePage',
'foreignKey' => 'site_page_id',
),
);
public $hasMany = array(
'SitePageContent' => array(
'className' => 'FoCMS.SitePageContent',
'foreignKey' => 'site_page_group_id',
'dependent' => FALSE,
),
);
// SitePageContent Model
public $belongsTo = array(
'SitePageGroup' => array(
'className' => 'FoCMS.SitePageGroup',
'foreignKey' => 'site_page_group_id',
),
);
Using the answer in that linked question I am seeing the parent model, SitePage being duplicated, but the associated models are being removed from the original and associated with the new one.
$record = $this->SitePage->find('first', array('condition' => array('SitePage.id' => $id)));
unset($record['SitePage']['id'], $record['SitePageGroup']['id'], $record['SitePageGroup']['SitePageContent']['id'] /* further ids */);
$this->SitePage->create();
$record['SitePage']['name'] = $record['SitePage']['name'].'-copy';
$record['SitePage']['friendly_name'] = $record['SitePage']['friendly_name'].' Copy';
if($this->SitePage->saveAll($record)){
$this->Session->setFlash('The site page has been saved', 'fo_message');
$this->redirect(array('action' => 'index'));
}else{
$this->Session->setFlash('The site page could not be saved. Please, try again.', 'fo_message');
}
Update
Debugging the record that I'm trying to reset I see the following
array(
'SitePage' => array(
'name' => 'test',
'friendly_name' => 'Test',
'order' => '82',
'created' => '2015-09-03 19:16:40',
'modified' => '2015-09-03 19:20:27'
),
'SitePageGroup' => array(
(int) 0 => array(
'id' => '55e88087-a4dc-4c37-89dc-f9c172b40463',
'site_page_id' => '55e88078-16c8-46ce-bf02-fa5372b40463',
'name' => 'group-1',
'friendly_name' => 'Group 1',
'order' => '1',
'created' => '2015-09-03 19:16:55',
'modified' => '2015-09-03 19:16:55'
),
(int) 1 => array(
'id' => '55e8809e-d018-4ebe-a4cf-fbef72b40463',
'site_page_id' => '55e88078-16c8-46ce-bf02-fa5372b40463',
'name' => 'group-2',
'friendly_name' => 'Group 2',
'order' => '2',
'created' => '2015-09-03 19:17:18',
'modified' => '2015-09-03 19:17:18'
)
)
)
The way I am getting this result is by doing this
$sitePage = $this->SitePage->find('first', array(
'conditions' => array(
'SitePage.id' => $id,
),
));
unset($sitePage['SitePage']['id'], $sitePage['SitePageGroup']['id'], $sitePage['SitePageGroup']['SitePageContent']['id'], $sitePage['SitePageGroup']['site_page_id'], $sitePage['SitePageGroup']['SitePageContent']['site_page_group_id'] /* further ids */);
debug($sitePage);
die();
But also also as you can see in the debug output the 3rd level of associated models are not being included, each of the SitePageGroup should also have a SitePageContent
I think a simple loop over the array of SitePageGroup should reset the id's and set the foreign keys to null, but I guess I also need to somehow include the SitePageContent that belongs to the SitePageGroup so I can reset those as well.
You need to ensure that all primary and foreign keys are set to null before saving. You only appear to be resetting the primary keys of your models but Cake needs to know that the foreign keys need generating so that they reference the new records.
Before calling $record it might be worth using debug($record); to check that everything in that array has been set/reset appropriately to ensure the copy will work as expected.
Update
Based on the array contents you've posted in your updated question it appears that you are not removing all the primary and foreign keys from your save data. You need to make sure that these are removed from everything you are about to save including the has many associations.
If you look at your array you should be able to see that unset($sitePage['SitePageGroup']['id']) will not remove the primary IDs of your SitePageGroup data as what you are unsetting doesn't correspond to array paths in your $sitePage array.
You can use CakePHP's Hash utility to remove the primary keys from the array like this:-
$sitePage = Hash::remove($sitePage, 'SitePageGroup.{n}.id');
And similarly for the foreign keys:-
$sitePage = Hash::remove($sitePage, 'SitePageGroup.{n}.site_page_id');

HABTM CakePHP no results for related model

I have problem with HABTM models. When I try to fetch any related model f.e. like this:
$this->Tagi->find('first');
I dont get any results for associated model. Result looks like this:
array(
'Tagi' => array(
'id' => '1',
'nazwa' => 'sth'
),
'Instytucje' => array()
)
I am sure that there should be result, I've double checked it, even
$this->Tagi->getDataSource()->getLog(false, false)
shows correct query, that fetches right results.
If you have any idea whats wrong plz give me a hint.
Tagi model:
public $hasAndBelongsToMany = array(
'Instytucje' =>
array(
'className' => 'Instytucje.Instytucje',
'joinTable' => 'instytucje-tagi',
'foreignKey' => 'tag_id',
'associationForeignKey' => 'instytucja_id',
'unique'=> true
)
);
Instytucje model:
public $hasAndBelongsToMany = array(
'Tagi' =>
array(
'className' => 'Instytucje.Tagi',
'joinTable' => 'instytucje-tagi',
'foreignKey' => 'instytucja_id',
'associationForeignKey' => 'tag_id',
'unique'=> true
)
);
EDIT:
Main problem is that HABTM refers to AppModel causing error:
Error: Table app_models for model AppModel was not found in datasource prod.
Which can be bypassed by adding $useTable in AppModel, which results in prior problem.
SOLVED
When using naming convention far beyond this Cake use, you have use third model with $useTable pointed on reference table.
Moreover its important to correctly point Cake to classes inside plugins.
I think you're problem relates to the fact that you are not using CakePHP's naming conventions. From the look of the query being generated Cake doesn't know how to correctly alias the join table, hence getting an AppModel alias in your query. I suspect that this is causing issues when Cake tries to build the results array from the query.
This might not work, but try creating a model for the joins table called InstytucjeTagi; then update your associations to use this using the with key:-
Tagi model:
public $hasAndBelongsToMany = array(
'Instytucje' =>
array(
'className' => 'Instytucje.Instytucje',
'joinTable' => 'instytucje-tagi',
'with' => 'InstytucjeTagi',
'foreignKey' => 'tag_id',
'associationForeignKey' => 'instytucja_id',
'unique'=> true
)
);
Instytucje model:
public $hasAndBelongsToMany = array(
'Tagi' =>
array(
'className' => 'Instytucje.Tagi',
'joinTable' => 'instytucje-tagi',
'with' => 'InstytucjeTagi',
'foreignKey' => 'instytucja_id',
'associationForeignKey' => 'tag_id',
'unique'=> true
)
);
If this doesn't fix it try using the afterFind() callback in the Tagi model to check what Cake is returning:-
afterFind($results, $primary = false) {
parent::afterFind($results, $primary);
// Print out the $results to check what Cake is returning.
debug($results);
return $results;
}

An instance of a model cannot be created once relation has been added CakePHP

I have three models in question: Customer, Company and User. Customer and User both belong to Company and Company has many Customers as following:
Customer:
var $belongsTo = array(
'Company' => array(
'className' => 'Company',
'foreignKey' => 'company_id',
'dependent' => false,
),
);
Company:
var $hasMany = array(
'User' => array(
'className' => 'User',
'foreignKey' => 'company_id',
'dependent' => false
),
'Customer'=>array(
'className' => 'Customer',
'foreignKey' => 'company_id',
'dependent' => false
)
);
User:
var $belongsTo = array(
'Company' => array(
'className' => 'Company',
'foreignKey' => 'company_id',
'dependent' => false,
),
);
I have a problem when creating/editing Customer objects. Here is how to create form looks like:
echo $this->Form->input('Customer.customer_nr');
echo $this->Form->input('Customer.name');
echo $this->Form->input('Customer.phone');
echo $this->Form->input('Customer.email');
echo $this->Form->input('Customer.address');
echo $this->Form->input('Customer.post_nr');
echo $this->Form->input('Customer.city');
echo $this->Form->input('Customer.company_id', array('value' => $current_user['company_id'], 'type'=>'hidden'));
What I do in the end of the form is I take company_id from a currently logged in user and insert it as a Customer.company_id. It used to work without any problems before the new relations have been introduced. But now as I try to create/edit Customer, I receive the following SQL error:
Error: SQLSTATE[23000]: Integrity constraint violation: 1052 Column 'name' in where clause is ambiguous
Any help is much much appreciated.
Here is the controller add function:
function add() {
if (!empty($this->data) ) {
$this->Customer->create();
if ($this->Customer->save($this->data)) {
$this->Session->setFlash(__('Customer was saved'), 'positive_notification');
$this->redirect(array('controller'=>'events', 'action' => 'dashboard'));
} else {
$this->Session->setFlash(__('Customer has been saved. Please, try again'), 'negative_notification');
}
}
}
The error is definately not being cause by redirect as it was fully tested.
the problem is somewhere else.
It's in fact related to a find() call.
Try to locate the exact code that trigger the error and post it in your question.
Probably you set some conditions like
'conditions' => array(
'name' => 'john'
)
but you better do something like
'conditions' => array(
'User.name' => 'john'
)
after you created the relationship between User and Company (it's just an example, maybe the two tabler involved are others) Cake started to join the two tables. So when you search for a particular name mysql doesn't know if you want user name or company name because you have name column in both tables.
If you look at the generated query (the one that gives you that error) you'll see the two tables joined. If you don't want that join you have to specify recursive => -1
'conditions' => array(
'name' => 'john'
),
'recursive' => -1

Associate different column name to one Model + cakephp

how to get name of (UserTransactionType.name) with Transaction.who_pay_fee_1,2,3 fields.
'user_transaction_type_id' works well but how to get the rest of fields work :(
//Transaction Model
public $belongsTo = array(
'UserTransactionType' => array(
'className' => 'UserTransactionType',
'foreignKey' => 'user_transaction_type_id',
'conditions' => '',
'fields' => '',
'order' => ''
),
//UserTransactionType Model
public $hasMany = array(
'Transaction' => array(
'className' => 'Transaction',
'foreignKey' => 'user_transaction_type_id',
'dependent' => false,
))
This is the sample code for your controller:
$this->UserTransactionType->find('all',array(
'fields' => array('name'),
'contain' => array('Transaction')
)
);
If Models are associated you can specify in 'contain' which of them you want to get in the result.
If you want to have only some fields of related Model, you can determine them after 'Transaction' in 'contain' just like in the regular find() query:
'contain' => array('Transaction' => array('fields' => array('field_1',
'field_2') ))
But in your case, you don't need to specify fields, because by default you get all fields.
So no matter if you define or not fields "who_pay_fee_1,2,3" because if you use 'contain' by default you will get foreing_key - user_transaction_type_id.
I hope it's helpful
For people they like CakePhp :)
in Controller ->
get the list of 'UserTransactionType'
in View ->
after looping trough all the transactions; in Transaction Status column simply load the 'UserTransactionType'array and assign the number of array to $userTransactionTypes.
$userTransactionTypes[$transaction['Who_pay_fee_1']];
To be honest it was straight forward but needed a bit concentration :)

what is CakePHP model alias used for?

In user model:
var $hasMany = array(
'Photo' => array(
'className' => 'Photo',
'foreignKey' => 'owner_id',
...
),
);
In photo model:
var $belongsTo = array(
'Owner' => array(
'className' => 'User',
'foreignKey' => 'owner_id',
...
),
);
Here one user has many photos.
So what my question is that here the alias name is 'Owner', which make me clear to understand the exact meaning of 'User', but is this the only reason to use alias? does it affect 'Photo' in user model? or how to use 'Owner' in/by cakephp?
I don't quite understand the meaning of alias in model.
Appreciate your help!
Two useful scenarios for aliases:
1. Multiple foreign keys to the same model
For example, your photos table has two fields: created_user_id & modified_user_id
var $belongsTo = array(
'CreatedUser' => array(
'className' => 'User',
'foreignKey' => 'created_user_id',
...
),
'ModifiedUser' => array(
'className' => 'User',
'foreignKey' => 'modified_user_id',
...
),
);
2. Creating logical words specific to your application's domain
Using the conditions field in the array, you could specify different kinds of models:
var $hasMany = array(
'ApprovedUser' => array(
'className' => 'User',
'foreignKey' => 'group_id',
'conditions' => array(
'User.approved' => 1,
'User.deleted' => 0
),
...
),
'UnapprovedUser' => array(
'className' => 'User',
'foreignKey' => 'group_id',
'conditions' => array(
'User.approved' => 0,
'User.deleted' => 0
),
...
),
'DeletedUser' => array(
'className' => 'User',
'foreignKey' => 'group_id',
'conditions' => array('User.deleted' => 1),
...
),
);
In the above example, a Group model has different kinds of users (approved, unapproved and deleted). Using aliases helps make your code very elegant.
It allows you to do things like $this->Owner->read(null,$userId); You can have an OwnersController and views/owners.
It is ... an alias. In a sense, User is an alias for the db table users.
A better example: I have a CMS where I use the table articles for Article, BlogItem and News. Those three names are aliases for the same table that allow me to set up different models, relationships and behaviour. So I have a BlogItemsController and a NewsController as well as an ArticlesController.

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