I am trying to fetch associated objects through 3 tables (user, client, account). User has a one-to-many relationship to client, client has a one-to-many relationship to account. I easily fetch all the clients for one specific user using this simple code:
$user = $this->getUser();
$id = $user->getId();
$user = $this->getDoctrine()->getRepository('AcmeUserBundle:User')->find($id);
$clients = $user->getClients();
Similarly, I have no issue retrieving all accounts for one specific client using this code:
$client = $this->getDoctrine()->getRepository('AcmeUserBundle:Client')->find($clientref);
$accounts = $client->getAccounts();
Now I want to obtain directly all accounts related to one user. How do I do so? I tried the following:
$user = $this->getUser();
$id = $user->getId();
$user = $this->getDoctrine()->getRepository('AcmeUserBundle:User')->find($id);
$client = $user->getClients();
$accounts = $client->getAccounts();
But I get the following error 'Attempted to call method "getAccounts" on class "Doctrine\ORM\PersistentCollection"'.
I believe I am missing something because "Accounts" may not be lazy loaded by Doctrine when I fetch the user, only "Clients" are. What is the best way to achieve this? Could you give me an example of code that would work (e.g. iteration or DQL query)?
Thanks.
That's correct behavior. A collection is returned by $user->getClients(), not a single object. Doctrine's collections do not proxy method calls to their members. There are two ways to solve your problem:
The simpler one. Rely on Doctrine's lazy load. Let's say you use data like this:
foreach ($client as $user->getClients()) {
foreach ($account as $client->getAccounts()) {
echo $account->getId();
}
}
ORM will fetch accounts automatically, running a separate query to database for each client. This will do only if you don't care about performance: O(N) requests are bad.
The better one. Use LEFT JOIN to get all the data with one query to database.
$qb = $this->getDoctrine()->getManager()->createQueryBuilder()
->select('u, c, a')
->from('AcmeUserBundle:User', 'u')
->leftJoin('u.clients', 'c')
->leftJoin('c.accounts', 'a')
->where('u.id = :id');
$user = $qb->getQuery()
->setParameter('id', $id)
->getOneOrNullResult();
Related
I working on an application that has its own database and gets user information from another serivce (an LDAP is this case, through an API package).
Say I have a tables called Articles, with a column user_id. There is no Users table, instead a user or set of users is retrieved through the external API:
$user = LDAPConnector::getUser($user_id);
$users = LDAPConnector::getUsers([1, 2, 5, 6]);
Of course I want retrieving data from inside a controller to be as simple as possible, ideally still with something like:
$articles = $this->Articles->find()->contain('Users');
foreach ($articles as $article) {
echo $article->user->getFullname();
}
I'm not sure how to approach this.
Where should I place the code in the table object to allow integration with the external API?
And as a bonus question: How to minimise the number of LDAP queries when filling the Entities?
i.e. it seems to be a lot faster by first retrieving the relevant users with a single ->getUsers() and placing them later, even though iterating over the articles and using multiple ->getUser() might be simpler.
The most simple solution would be to use a result formatter to fetch and inject the external data.
The more sophisticated solution would a custom association, and a custom association loader, but given how database-centric associations are, you'd probably also have to come up with a table and possibly a query implementation that handles your LDAP datasource. While it would be rather simple to move this into a custom association, containing the association will look up a matching table, cause the schema to be inspected, etc.
So I'll stick with providing an example for the first option. A result formatter would be pretty simple, something like this:
$this->Articles
->find()
->formatResults(function (\Cake\Collection\CollectionInterface $results) {
$userIds = array_unique($results->extract('user_id')->toArray());
$users = LDAPConnector::getUsers($userIds);
$usersMap = collection($users)->indexBy('id')->toArray();
return $results
->map(function ($article) use ($usersMap) {
if (isset($usersMap[$article['user_id']])) {
$article['user'] = $usersMap[$article['user_id']];
}
return $article;
});
});
The example makes the assumption that the data returned from LDAPConnector::getUsers() is a collection of associative arrays, with an id key that matches the user id. You'd have to adapt this accordingly, depending on what exactly LDAPConnector::getUsers() returns.
That aside, the example should be rather self-explanatory, first obtain a unique list of users IDs found in the queried articles, obtain the LDAP users using those IDs, then inject the users into the articles.
If you wanted to have entities in your results, then create entities from the user data, for example like this:
$userData = $usersMap[$article['user_id']];
$article['user'] = new \App\Model\Entity\User($userData);
For better reusability, put the formatter in a custom finder. In your ArticlesTable class:
public function findWithUsers(\Cake\ORM\Query $query, array $options)
{
return $query->formatResults(/* ... */);
}
Then you can just do $this->Articles->find('withUsers'), just as simple as containing.
See also
Cookbook > Database Access & ORM > Query Builder > Adding Calculated Fields
Cookbook > Database Access & ORM > Retrieving Data & Results Sets > Custom Finder Methods
I want to use Yii2 and redis as database.
So far, I got Redis ActiveRecord Class for Yii2 from Here.
link1
link2
but, I got a problem. WHY THIS CLASS ADDS ANYTHING AS HASH IN REDIS????
Above that I cant Find in which pattern it Insert data. I add one user and it will add a user under user:xxx namespace and another record under s:user:xxx and so on but none of theme has any fields that i defined in attributes!! only contain IDs.
I know that a Key-value type database and RDBMS are different and also know how can implement relation like records in Redis, but I don't know why it will only save IDs.
I could not find any example of using redis ActiveRecords so far.
There is one in here and its not good enough.
So here is my main wuestion: how can add data to redis Using activeRecords and different data types In YII2?
And if its impossible with ActiveRecords what is the best solution? in this case
ANOTHER QUESTION: is it possible to use a Model instead and write my own model::save() method? and what is the best data validation solution at this rate?
Actually I want to make a telegram bot, so i should get messages and send them in RabitMQ and get data in a worker, do the process and save results to Redis, and finally send response to user through the RabitMQ.
So I need to do a lot of validations AND OF COURSE AUTHENTICATIONS and save and select and range and save to sets an lists and this and that ....
I want a good way to make Model or active record or the proper solution to validation, save and retrieve data to Redis and Yii2.
Redis DB can be declared as a cache component or as a database connection or both.
When it is declared as a cache component (using the yii/redis/cache) it is accessible within that component to store key/value pairs as shown here.
$cache = Yii::$app->cache;
// try retrieving $data from cache
$data = $cache->get($key);
// store $data in cache so that it can be retrieved next time
$cache->set($key, $data);
// one more example:
$access_token = Yii::$app->security->generateRandomString();
$cache->add(
// key
$access_token,
// data (can also be an array)
[
'id' => Yii::$app->user->identity->id
'name' => Yii::$app->user->identity->name
],
// expires
60*60*3
);
Also other components may start using it for caching proposes like session if configured to do so or like the yii\web\UrlManager which by default will try to cache the generated URL rules in whatever valid caching mechanism defined under the config file's cache component as explained here. So it is normal to find some stored data other than yours in that case.
When Redis is declared as a DB connection like in the links you provided which means using the yii\redis\Connection class you can make your model extending its \yii\redis\ActiveRecord class as any other ActiveRecord model in Yii. The only difference I know so far is that you need to define your attributes manually as there is no DB schema to parse for NoSQL databases. Then just define your rules, scenarios, relations, events, ... as any other ActiveRecord model:
class Customer extends \yii\redis\ActiveRecord
{
public function attributes()
{
return ['id', 'name', 'address', 'registration_date'];
}
public function rules()
{
return [
['name', 'required'],
['name', 'string', 'min' => 3, 'max' => 12, 'on' => 'register'],
...
];
}
public function attributeLabels() {...}
...
}
All available methods including save(), validate(), getErrors(), ... could be found here and should be used like any other ActiveRecord class as shown in the official guide.
The question might sound a little bit confusing but I don't know how to explain it better in one sentence.
This describes basically what the problem is:
I have a Users table which can contain 2 types of users. I know how I can separate by role. But here's the thing, users with role 1(editor_in_chief) have different attributes than users with role 2(reviewer).
My idea was to create a table named 'reviewer_attributes' and 'editor_in_chief_attributes' and create a one-to-one relation with this table to hold the attributes for the users table.
Maybe you have a better idea, that would be great as well. But for this scenario, I would like to know if it is possible to make a call to the database and to get these users' properties from the other table as properties of the User object.
When using a DB call using relations laravel will give me something like this:
user {
id: 1,
name: "Name",
reviewer_attributes: {
attribute_1: 'attribute_1',
attribute_2: 'attribute_2',
attribute_3: 'attribute_3',
}
}
But this is what I want to object to obtain look like:
user {
id: 1,
name: "Name",
attribute_1: 'attribute_1',
attribute_2: 'attribute_2',
attribute_3: 'attribute_3',
}
I want to achieve this by a single database call instead of setting the properties after the call.
I find this a very interesting topic, I hope you could help!
If I got your problem right, you may call somthing like this:
DB::table('users')
->join('reviewer_attributes', 'users.id', '=', 'reviewer_attributes.user_id')
->find($id);
you may add select to get specific attributes of each table:
DB::table('users')
->join('reviewer_attributes', 'users.id', '=', 'reviewer_attributes.user_id')
->select('users.id', 'users.name', 'reviewer_attributes.*')
->find($id);
Update: You can also use collections to restructure your results returned by Eloquent:
$result = User::with('reviewerAttributes')->find($id);
$result = $result->get('reviewer_attributes')
->merge($result->forget('reviewer_attributes')->all())
->all();
You need export model to Json?
If so, override toArray method
public function toArray()
{
$arr = parent::toArray();
$reviewer_attributes = $this->getReviewerAttributesSomeHow();
return array_merge($arr, $reviewer_attributes);
}
I have three entities : Event, Photo and User.
Three main relations :
An Event has 0 or more photos (blue relation, OneToMany)
An Event has been created by one photo, which I call the firstPhoto (red relation,
OneToOne)
A user can create 0 or more photos (violet relation,
OneToMany)
What I want is to map the relation between an Event and the User who created it, without adding or changing my database. It means the user that created the firstPhoto of the Event.
I'm not looking for a SQL query which I succed to do but really a mapping in my User.php Entity.
$user->getEvents() would give the events the user created.
I can't success to do so... any idea ? Am I obliged to add or change something in my database ?
I see 2 ways of doing that:
1) make a named native query http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/native-sql.html#named-native-query
2) write something like
public function getEvents()
{
$res = array();
$photos = $this->getPhotos();
foreach($photos as $photo) {
$res[] = $photo->getEvent();
}
return $res;
}
I am new to code igniter data mapper. I have a table called user, and I am trying to retrieve data from the database table and show them to the user.
Here is what I have in the model:
$u=new User();
$results=$u->get_by_user_id($id);
//$results here will be set to huge bunch of none sense data( which also includes the row that I am looking for as well)
if ($u->exists())
{
foreach ($results->all as $row){
$data['user']['first_name']=($row->user_first); //this where I am stuck ..
$data['user']['last_name']=($row->user_last);//this is also where I am stuck..
}
I don't know how to treat results to get a required fields I am looking for and store them in the $data I am passing to the user to view.
Thanks!
When you call get_by_x() on the model, the fields will be populated with data and you can access them like this:
$u = new User();
$u->get_by_user_id($id);
if($u->exists())
{
// you can access the table columns as object fields
$data['user']['first'] = $u->first;
$data['user']['last'] = $u->last;
}
else
{
$data['error'] = 'No such user!';
}
Have a look at the documentation which is really helpful: see Get and Get By.
Also, DataMapper expects all tables to have an id column: see Table Naming Rules. If your column is named id you should then call $u->get_by_id($id) instead of $u->get_by_user_id($id).