I have a User entity with a hasMany relationship to Profile via a user_id foreign key.
Within my User class I'm trying to create a virtual field so I can access the name property of the linked Profile entity
protected $_virtual = ['profile_name'];
protected function _getProfileName()
{
return $this->profile->name;
}
Whatever I try I get Trying to get property of non-object
I've also tried:
$this->_properties['profile']->name;
$this->profile->_properties['name'];
I know I can get this data by building a query up using Cake\ORM\Table but I has hoping to aovid that.
What am I doing wrong?
p.s. there is definitely linked data between the two tables.
The answer seems to be
That's not how it works
Instead, use 'eager loading' to get the linked entity data. That is to say use the contain method when using find():
e.g.
$users = TableRegistry::get('users');
$query = $users->find('all', ['contain' => ["Profiles"]])
->where(['id' => $userId])
->first();
or on the query object itself:
$query->contain(['Profiles']);
In this example $query will contain Profile entity objects along with the User entity
i.e. $query->profiles is an array of Profile entities
Related
I have a one-to-one relationship between User and UserSettings models,
But (after $user = auth()->user()) when I try $user->settings()->something it throws an Undefined property error.
It's gone when I use $user->settings()->first()->something...
My question is, is this how it's supposed to work? or am I doing something wrong?
You cannot directly run $user->settings()->something.
Because when you call $user->settings(), it just return Illuminate\Database\Eloquent\Relations\HasOne object.
So it is not the model's object, you need to take the model's object and call its attribute like this.
$user->settings()->first()->something;
Dynamic Properties
Since you have one-to-one relationship between User and UserSettings.
If you have a one-to-one relationship in your User model:
public function settings()
{
return $this->hasOne('App\Models\UserSettings', 'user_id', 'id');
}
According to Laravel doc
Once the relationship is defined, we may retrieve the related record using Eloquent's dynamic properties. Dynamic properties allow you to access relationship methods as if they were properties defined on the model:
Eloquent will automatically load the relationship for you, and is even smart enough to know whether to call the get (for one-to-many relationships) or first (for one-to-one relationships) method. It will then be accessible via a dynamic property by the same name as the relation.
So you can use eloquent's dynamic properties like this:
$user->settings->something; // settings is the dynamic property of $user.
This code will give you a result of collection.
$user->settings;
So calling 'something' is not available or it will return you of null, unless you get the specific index of it.
$user->settings()->something
while this one works because you used first() to get the first data of collection and accessed the properties of it .
$user->settings()->first()->something
The first method returns the first element in the collection that passes a given truth test
see docs here laravel docs
If you want to get the user settings itself simply do this:
$user->settings
Then you can get the fields of the settings doing this:
$user->settings->something
When you do this $user->settings() you can chain query after that. E.g.
$user->settings()->where('something', 'hello')->first()
That's why the output of $user->settings and $user->settings()->first() are the same.
Auth only gives you user info;
Try the following code:
$user = User::find(auth()->user()->id);//and then
$user->settings->something;
What I'm trying to do is to show the posts that have been saved by the user in the profile. I will try to explain it as good as possible refering to my code. So:
public function userProfil($id)
I have the profile function which get the data from userprofile table. and inside I have the following code for saved data:
$authed = User::find($id);
$savedarticles = $authed->mysaves;
$allsavings = DB::select("Select * from article where id=$savedarticles->id");
But this code does not work like this anyway. I can do this instead:
$authed = User::find($id);
$savedarticles = $authed->mysaves;
But when I try to get articles from article table with the article_id of mysaves, it does not work such as this:
$allsaved= DB::table('article')->where('id', $savedarticles->article_id);
the error it gives is like:
Property [article_id] does not exist on this collection instance.
although savearticle table has article_id I can output it without the line above and in view I get them as:
#foreach($savedarticles as $savedarticle)
<p>{{$savedarticle}}</p>
#endforeach
it gives me everything that is in the savearticle table and I can get do savedarticle->article_id and get article_id but can't get it in controller.
I am using Laravel 5.4.
The error message Property [article_id] does not exist on this collection instance. means you are trying to get an attribute of a single instance but from a collection.
For example the collection could be like
[$article1, $article2, $article3]
therefore what you tried to do is something similar to
[$article1, $article2, $article3]->article_id
You are trying to get an attribute from a collection instead of a single instance.
As for your query, you can use where in sql statement to search for rows that match any item in an array
$allsaved= DB::table('article')->whereIn('id', $savedarticles->pluck('article_id')->all());
What I have understood is that A USER has many POSTS and a POST belong to an article.
If this is true then you have to do following.
1: In USER model define a relation to get all posts. like below.
public function posts() {
// Foreign key will be a key that is stored in posts table and represent the user MAY BE: user_id
$this->hasMany(Posts::class, 'foreign_key', 'local_key')
}
This will allow you to get all posts belong to a user.
2: In posts, model defines a user relation like below.
public function user() {
$this->belongsTo(User::class, 'foreign_key', 'local_key');
}
This will allow you to get a post User;
3: Now in your controller you will have something like this.
public function show($user_id) {
// find a user with posts as eager loading(to avoid query again)
$user = User::with(['posts'])->where('id', $user_id)->first();
// get all posts that belong to this user
$posts = $user->posts;
}
In controller show($user_id) method you will have a user data as well as user posts data. Now if you want to get a post relations then simply define as below. let say a post belongs to an article as well.
4: In posts, model defines a relation to get an article.
public function article() {
// This will allow you to get a post artcle
$this->belongsTo(Article::class, 'foreign_key', 'local_key');
}
Now you can get the article as well while finding a user. please see below. I am rewriting controller show action to give you a better understanding.
5: Get a user with user_id
public function show($user_id) {
// find a user with posts as eager loading(to avoid query again)
// eager loading for posts & post child, this will give you NOSQL at runtime and all data will come from one query.
$user = User::with(['posts', 'posts.article'])->where('id', $user_id)->first();
// get all posts that belong to this user
$posts = $user->posts;
foreach($posts as $post) {
$article = $post->article; // Child relation of post.
}
}
Hope you will understand the flow, you have to make sure models relation to work it perfectly. If you need further help please let me know.
Here is model structure of my Laravel 5.3 project,
User.php (Model)
it has one invitation method that returns the invitation of a user.
public function invitations()
{
return $this->hasMany( 'App\Invitation', 'invitee_id', 'id' );
}
Invitation.php (Model)
This model has another method that would return the inviter detail of an invitation.
public function inviter()
{
return $this->hasOne( 'App\User', 'id', 'invited_by' );
}
If i want to retrieve all invitations of current user it works,
\Auth::user()->invitations;
But if i try to get the information about the inviter it won't work! (Question: How to do it?)
\Auth::user()->invitations->inviter;
Though i can query the inviter from a invitation eloquent object like this,
\App\Invitation::first()->inviter;
But this is not working when i try to access it from the user model -> invitation -> inviter!
Also can i use eager loading here?
\Auth::user()->invitations->inviter;
Looking at this, it appears that you're attempting to retrieve the inviter property from a collection of invitations. The reason Ken's suggestion to use \App\Invitation::first()->inviter; worked is because you are retrieving the inviter of only one invitation (in this instance, the first). To resolve this, loop through your invites before attempting to retrieve the properties for each one:
$invitations = \Auth::user()->invitations;
foreach ($invitations as $invitation) {
$inviter = $invitation->inviter;
}
There is also an each() method specific to Laravel Collections that will allow you to loop through your object.
In Laravel $user = Auth::user() returns the currently logged in user. From this user I want to retrieve only a few columns into a key-value array. What are my options?
Example:
$user = Auth::user()->fetch('id', 'username', 'email');
should give me
[
"id" => 1,
"username" => "John Doe",
"email" => "john#doe.example"
]
I've searched the Eloquent documentation, but haven't found the function I'm looking for. Have I missed it? Does such a function not exist?
If your main objective is to get an array instead of an object, and extra fields in the array are not a problem given that your required fields are there, you could just cast the user model to array:
Auth::user()->toArray();
(array) Auth::user();
However, if you need the output to only have these 3 properties - you have to do a little bit of extra coding. What I would propose is to create a property in User model that contains a list of publicly exposed fields. Then override toArray() method (or create another method) that only returns fields from the list.
Auth::user() fetches a user object for you, so you are no longer in Eloquent and can't use Eloquent methods.
There's no method on a model that returns an array of given attributes (reference: https://laravel.com/api/5.2/Illuminate/Database/Eloquent/Model.html), but you can make one on your User model, for instance like this:
function myData($keys) {
return array_intersect_key($this->toArray(), array_flip($keys))
}
Then you can call it using $user->myData(['id', 'username', 'keys'])
I am trying to figure out a relationship but I can't seem to solve the issue.
So what my script does first is checking if there is a valid session where status = 0.
Then I want to check if there is a valid trial where status = 0 ->first() associated with that session. And if so, I want to grab all the relevant data related by trial_id.
I understand what logic is required. However, I am wondering if there is a method to do this with as little commands as possible using Eloquent relationships.
Specifically, once i have the $session object. How can I filter the trials, in order to get the appropriate stimuli_tracker data?
The important components to the relationships for the table is as follows:
Sessions
id (has one to many relationship to trials(sessions_id)
user_id (foreign key)
status
Trials
id (one to many relationship with stimuli_tracker)
sessions_id (foreign key)
status
Stimuli_Tracker
trials_id (foreign key)
stimulus
stimulus_type
Sessions Model
class Sessions extends Model
{
protected $table = 'sessions';
public function stimuliTracker()
{
return $this->hasManyThrough('App\StimuliTracker', 'App\Trials', 'sessions_id','trials_id');
}
}
Trials Model:
class Trials extends Model
{
public function stimuli()
{
return $this->hasMany(App\StimuliTracker);
}
}
EDIT
I have tried in artisan tinker to
$object = \App\Session::where(arg);
then I tried to
$object->stimulus
but didn't work. I tried a few other fields but I only received null. Maybe I'm not getting how to grab the content properly
$object->stimulus is an undefined attribute based on what you've shown in your code.
To access the stimulus information for your session, you have to use the name of the relationship, which in this case is:
$object->stimuliTracker
The thing is that this will return an Eloquent Collection because it is a hasManyThrough relationship (which is a hasMany of a hasMany).
I'm assuming that the 'stimulus' attribute belongs to the StimuliTracker class. If this is the case, then you will need to loop through your StimuliTracker Collection to extract it:
foreach ( $object->stimuliTracker as $record )
{
$stimulus = $record->stimulus;
// do something with $stimulus
}
EDIT (Added):
If you are just looking for an array of the values in the 'stimulus' attribute, you can get that with the lists() method:
$stimulus_values = $object->stimuliTracker->lists('stimulus');