I have 2 models, one is a Poll, and another is an User. I have set up a M:N relationship between both of them:
User.php
public function votedPolls() {
return $this->belongsToMany('Polls', 'votes');
}
Poll.php
public function voters() {
return $this->belongsToMany('User', 'votes');
}
And it all works nicely. When I vote on a poll, the table votes get populated properly. But now I want to check inside the controller if a user has already voted in a poll.
I figured it would be something like this, but I am not sure of the syntax. I tried this (which does not work):
$voters = $poll->voters()->where('id', '=', $user->id)->first();
$voted = count($voters) == 1;
How could I achieve this?
count is preferred way of checking if relations exist.
Your code didn't work because your pivot table also has id column and where clause was ambiguous, so change it to:
where('users.id','=',$user->id)
Related
In my Laravel project I've got a model (and an underlying table) for lessons. Now I'm trying to write a local scope for returning all lessons that have been finished by a particular user. The definition of "finished" is that there exists a row in a table named "lesson_results" with this lesson's ID and the users ID.
My scope currently looks like this:
public function scopeFinished($query, User $user)
{
return $query->join('lesson_results', function($join) use($user)
{
$join->on('lesson_results.lesson_id', '=', 'lessons.id')
->where("user_id", $user->id);
});
}
This kinda works. When I do a Lesson::finished($user)->get() I get out the correct lessons for that user. However the lessons in the collection returned all have the wrong ID's! The ID's I see are the ID's from the lesson_results table. So when I check $lesson->id from one of the returned items I don't get the ID from that lesson, but the ID from the corresponding row in the lesson_results table.
I've checked in mysql and the full query sent from Laravel is the following
select * from `lessons` inner join `lesson_results` on `lesson_results`.`lesson_id` = `lessons`.`id` and `user_id` = 53
This query DO return two columns named id (the one from the lessons table and the one from the lesson_results table) and it seems Laravel is using the wrong one for the result returned.
I don't know if I'm going about this the wrong way or if it's a bug somewhere?
This is on Laravel 7.6.1.
edit: Ok, I think I actually solved it now. Not really sure though if it's a real solution or just a workaround. I added a select() call so the return row now is
return $query->select('lessons.*')->join('lesson_results', function($join) use($user)
...which makes it only return the stuff from the lessons table. But should that really be needed?
One of the same column names will be covered by the other.
Solution 1:
Specify the table with the column, and alias the other table's column if it has same column name.
Lesson::finished($user)->select('lessons.*', 'lesson_results.id AS lesson_result_id', 'lesson_results.column1', 'lesson_results.column2',...)->get();
Solution 2:
Or you can use Eloquent-Builder eager-loading whereHas,(Assuming you have build the relationship between model Lesson and model LessonResult)
public function scopeFinished($query, User $user)
{
return $query->whereHas('lessonResults', function($query) use($user)
{
$query->where("user_id", $user->id);
});
}
So you can get lesson like this:
Lesson::finished($user)->get();
I am trying to query data from my database and pass the results to a view called events, the problem I have is that one of my queries will always return the same result because in the where condition the $events_id is the same always. Is there a better way to do the querying? A better logic?
This code is from my controller called EventController:
public function index()
{
$firm_id = DB::table('firms')->where('user_id', auth()->id())->value('id');
$events_id = DB::table('events')->where('firm_id', $firm_id)->value('id');
$events = DB::table('events')->where('firm_id', $firm_id)->get()->toArray();
$actual_events = DB::table('actual_events')->where('event_id', $events_id)->get()->toArray();
return view('events',['events' => $events,'actual_events' => $actual_events]);
}
Since the $events_id is the same every time, the $actual_events will only contain the first result.
The image I have uploaded shows the problem, my table's first three columns are fine. Starting from the fourth they contain repeated values:
As I guess, you need something like this:
$event_ids = DB::table('events')->where('firm_id', $firm_id)->pluck('id');
$actual_events = DB::table('actual_events')->whereIn('event_id', $event_ids)->get()->toArray();
or write about your problem in details and I will try to help you.
you just said that your tables have relation together.
in this case it's better you using the eloquent for that,
first you should type the relations in model of each table like this:
class User extends Authenticatable{
public function cities()
{
return $this->hasmany('App\City'); //you should type your relation
}
}
for relations you can use this link: laravel relationships
after that when you compact the $user variable to your view, you can use this syntax for getting the city value relation to this user: $user->cities;.
I have Order model with another relation OrderPhoto:
public function OrderPhoto()
{
return $this->hasMany('App\OrderPhoto');
}
In turn OrderPhoto model has relation:
public function Photo()
{
return $this->belongsToMany('App\Photo');
}
So, how to get data from OrderModel with related data from third model Photo?
I guess this:
Order::with("OrderPhoto.Photo")->get();
to retrieve only data from Photo model for each Order
So, each Order has some OrderPhotos. Relationship is one to many.
But one item from OrderPhotos is related with primary key from table Photos. It is one to one relation.
My result query should be:
select `photos`.*, `ordersphoto`.`Orders_Id` from `photos` inner join `ordersphoto` on `ordersphoto`.`Photos_Id` = `photos`.`Id` where `ordersphoto`.`Orders_Id` in (1);
How to use hasManyThrough for this query?
Just having a quick look at your relationships it looks like you could create a hasManyThrough relationship on the order Model.
public function Photo {
return $this->hasManyThrough('App\OrderPhoto', 'App\Photo')
}
You may need to add the table keys to make it work
This will allow you to do:
Order::with("Photo")->get();
You can see more details here https://laravel.com/docs/5.5/eloquent-relationships#has-many-through
Update
Try this
public function Photo {
return $this->hasManyThrough('App\Photo', 'App\OrderPhoto', 'Order_id', 'Photos_id', 'id', 'id')
}
It is a little hard to get my head around your DB structure with this info but you should hopefully be able to work it out. This may also help
https://laravel.com/api/5.7/Illuminate/Database/Eloquent/Concerns/HasRelationships.html#method_hasManyThrough
This is my first post in here, so please forgive any mistakes :)
I'm currently working on the project of stock management application (Laravel). I came to the point where anything I do doesn't work, so now I beg for help with it.
I have a table with products, of which some are in the relationship with the others. Everything happens in one table. If the product has a child, the child overrides the parent.
products table view
Then, all the queries I run on them use the following logic:
If the item doesn't have any child, use it.
If the item has children, use the latest child (highest id)
Now I have the relationships created in model file:
public function childItems(){
return $this->hasMany('\App\OrderItem','parent_id');
}
public function parentItem(){
return $this->belongsTo('\App\OrderItem','parent_id');
}
public function latestChild(){
return $this->hasOne('\App\OrderItem','parent_id')->orderBy('id','desc')->limit(1);
}
The problem with latestChild() relationship is, that when you run this query:
\App\OrderItem::find(7)->latestChild()->get()
It works fine and returns only one (latest)(id 6) record in relationship - to do it I had to add orderBy and limit to hasOne().
But when I want to use this relationship in scopes, so in whereHas method, it doesn't work properly, as takes any of the children instead of the latest one.
public function scopeDue($query){
return $query->where(function($q){
$q->has('childItems','==',0)->has('parentItem','==',0)->whereDate('due_date','=', Carbon::today()->toDateString())->whereNull('return_date');
})->orWhere(function($q2){
$q2->has('childItems')->has('parentItem','==',0)->whereHas('childItems',function($q3) use($q2){
$q3->whereDate('due_date','=', Carbon::today()->toDateString())->whereNull('return_date');
});
})->with('latestChild');
}
However, with() at the end returns the right record.
I think, the reason it works so is because my relationship latestChild() returns all the children (despite hasOne()) and when i use it in whereHas it ignores the filtering functions I applied.
I know it's a little bit complex from what I describe, but to explain it better I will use an example. Executing the following in tinker
\App\OrderItem::due()->get();
Should return only record id 2, as the number seven has children, where of course id 5 is due, but the latest child is id 6 which is not due.
I hope I've explained it enough to let you help me, as I'm already going crazy with it.
If you have any ideas on how I could achieve what I need by changing exisiting one or changing the whole logic of it, please help!
Thanks,
Darek
Try this one:
->with(
[
'latestChild' => function (HasOne $query) {
return $query->latest('id')->limit(1);
}
]
);
I think the problem is in your latestChild() method where you do a limit(1). Why don't you try the last() method instead?
So:
public function latestChild(){
return $this->hasOne('\App\OrderItem','parent_id')->last();
}
EDIT:
What about returning the value like this:
public function latestChild(){
$item = App\OrderItem::all()->last();
return $item;
}
I have in my database a pivot table that stores extra information. It has 2 foreign keys, and an additional field. Here's what it looks like:
EventTeam
int event_id (fk)
int team_id (fk)
boolean home
The intent here is that an Event may have many teams (in fact, it must have at least 2, but that's not a database constraint), and a team may participate in many events. However, for each event-team relationship, I want to also track whether the team is considered the home team for that event.
How do I define my model with this in mind? Do I have an EventTeam model at all, or do I define a belongsToMany relationship in both the Team and Event models? If I need a separate model, what relationships do I define in it? If I don't, how do I add the boolean field to the pivot table that gets used? I really have no idea how to do this.
You dont need a EventTeam model per se, but it could come in handy for seeders or if you are going to attach models to your EventTeam connection anywhere else in your app. This should work:
Event model:
public function teams()
{
return $this->belongsToMany('Team');
}
Team model:
public function events()
{
return $this->belongsToMany('Event');
}
For the extra boolean you can use ->withPivot().
$this->belongsToMany('Event')->withPivot('is_home');
See http://laravel.com/docs/eloquent#working-with-pivot-tables for more info.
Updated answers:
1) I would put it in both models so you can access the pivot data from both sides without a problem.
2) It should be to column name indeed.
3) Like i said its not really needed for you in this situation, but you could do this:
EventTeam model:
public function event()
{
return $this->belongsTo('Event');
}
public function team()
{
return $this->belongsTo('Team');
}
Add withPivot('home') on your relations definitions, then you can access it like this:
$team->events->first()->pivot->home; // 0/1
$event->teams->first()->pivot->home; // 0/1
first is just an example of getting single related model here.
Now, next thing is adding that value to the relation:
$team = Team::find($id);
$event = Event::find($eventId);
$team->events()->attach($event, ['home' => 1]);
// or
$team->events()->attach($eventId, ['home' => 1]);
// or using sync
$event->teams()->sync([1,5,15], ['home' => 0]);
Another thing is querying that field:
// load first team and related events, that the team hosts
$team = Team::with(['events'=>function ($q) {
$q->wherePivot('home', 1);
}])->first();
// load only teams that are hosts for any event
$hostTeams = Team::whereHas('events', function ($q) {
// wherePivot won't work here!
$q->where('event_team.home', 1);
})->get();
and so on.