I have three tables.
Users: id,name
Courses: id,user_id,name
Order: id,user_id,course_id (
Pivot table)
How can i make sure in course view that this user has purchased this particular course using Laravel eloquent.
Firstly, you need to define a many to many relationship between your models:
class User extends Model {
public function courses() {
return $this->belongsToMany(Course::class);
}
}
Once you have it, you can easily check if User has bought access to a Course with given ID with:
if ($user->courses()->find($courseId)) {
// user has access to course with given $courseId
}
If you simply want to an error to be raised when course was not bought, replace a call to find() with a call to findOrFail():
if ($user->courses()->findOrFail($courseId)) {
// user has access to course with given $courseId
}
Related
I have 3 tables:
customer: fields: id, name
item: fields: id, name
customer_items: fields: customer_id, item_id, qty
Customer and Item have their separate Models as we would expect.
Question: How would I relate these two(Customer and Item) without having a pivot model.
I want to directly get customer items using $customer->items instead of doing $customer->customerItem->items which I find unnecessary since I don't want to track customerItems & customer by item.
Also, I cannot directly use customer_items table for Item model as I might need to retrieve all items in its controller.
As pointed out by #kerbholz (but they didn't create an answer so here it is), in your customer model you need the following function:
public function items()
{
return $this->belongsToMany('App\Item');
}
Which assumes your Item model class sits within App. You may also do the reverse in your Item model.
Now you should be able to do $customer->items and get a collection of items.
If you want to include the qty field then you need:
public function items()
{
return $this->belongsToMany('App\Item')->withPivot('qty');
}
Note that you still need the pivot table, you can't escape that, but you can now navigate it in a more elegant manner.
creat customer_items table and include custmer_item_id and user_id . in User model include this function
public function basket() // example
{
return $this->belongsToMany(User::class, 'customer_items', 'user_id', 'custmer_item_id');
}
A user can have one whitelabel.
A whitelabel can have many users.
I have a pivot table with whitelabel_id, and user_id columns
I have both relationships set up using ->belongsToMany() (with the inverse).
I am using a pivot table because I don't have a whitelabel_id on the users table (and won't be putting one in) so its defined as a many-to-many, but really it's one-to-many. I just get the first() whitelabel as there'll only be one for each user.
With this in mind. How do I select * users with the currently authenticated user's whitelabel?
I have this, it works, but is this the "Laravel" way? I feel it's slightly over engineered and Laravel would have a shorthand method.
$user->when(auth()->user()->whitelabel->first(), function ($query) {
return
$query->whereIn('id', auth()->user()->whitelabel->first()->users->pluck('id'));
})
This checks if the auth user has a whitelabel, and then gets all users with the same whitelabel.
Does Laravel have a quick shorthand for this?
Models:
class Whitelabel
{
public function users()
{
return $this->belongsToMany(User::class);
}
}
class User
{
public function whitelabels()
{
return $this->belongsToMany(Whitelabel::class);
}
}
you can retrieve records for simple
$user = User::find(Auth::id())
$user->whitelabels
if you want return all user in Auth user's whitelabel
foreach($user->whitelabels as $whitelabel){
$whitelabel->users
}
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');
I'm working on a project that has a many to many relationship between User and Club. This relationship works and I can get the respective objects with: $user->clubs. The pivot table I've named memberships. I can get the pivot data with $club->pivot. Foreign keys are defined for the memberships table in migrations.
However, I'd like the pivot table to be represented by a model so that I can easily update attributes of Membership such as role (Or even add a Role model to Membership!) or status.
I've looked at "Defining A Custom Pivot Model" in the docs, but what it says doesn't work for me, I get:
ErrorException
Argument 1 passed to Illuminate\Database\Eloquent\Model::__construct() must be of the type array, object given
I've also looked at this description of how to do it, but it's more or less the same as above.
Membership model:
class Membership extends Eloquent {
protected $table = 'memberships';
public function user()
{
return $this->belongsTo('User');
}
public function club()
{
return $this->belongsTo('Club');
}
}
Has anyone done this before?
This has been solved by a suggestion by a reddit user to extend Pivot in my Membership model. I also had to add ->withPivot('status', 'role')->withTimestamps() to the relationship declarations in the User and Club models.
You can do this by adding some manual code.
Your Membership model looks ok. You can get all clubs of a $user easily if you define method $user->clubs() where you get all the clubs manually.
clubs() {
$memberships=$this->memberships;
$clubs=new \Illuminate\Database\Eloquent\Collection();
foreach($memberships as $m) {
$clubs=$clubs->merge($m->clubs);
}
return $clubs;
}
I am trying to make a twitter like feed in an application, I have a database called connections where inside there's user and follow and another database called feed containing owner which would equal to the follow column in connections.
What I could do if had every id of a follower statically is to use where('owner', '=' $follow) on each follower and return it.
I tried this approach but it wasn't ideal:
Get each follower inside connections;
foreach(follower) {
Get 10 of the latest posts orderBy "created_at";
Push into array;
}
shuffle array;
limit array to 15;
return array;
That also ended with the returned array not being ordered by created date.
How would I use eloquent to get the feed item only if the user follows the owner in the best/simplest way?
Are there any specific Laravel tools that can be used?
Also the database layout isn't fixed as it is, it can be altered if needed to better suite this.
You need to create a many-to-many relationship between the user and itself. See the laravel eloquent documentation http://laravel.com/docs/eloquent#relationships. I didn't test this code but it should be enough to get you started down the right track.
Create a pivot table called "user_following" with:
(int) id, (int) user_id, (int) following_id
Then do something like this:
<?php
// Model
class User extends Eloquent {
public function following()
{
return $this->belongsToMany('User', 'user_following', 'user_id', 'following_id');
}
public function tweets()
{
return $this->hasMany('Tweet')->orderBy('created_at', 'desc');
}
}
// controller
$tweetsOfWhoImFollowing = User::find($id)->following->tweets;