I am trying to do this
select notifications.id, reservations.number from
notifications
JOIN reservations
ON notifications.reservation_id = reservations.id
WHERE notifications.status = 1
using eloquent so I have this this
$await = Notification::with('Reservation')->
select('notifications.id', 'reservations.number')
->where('notifications.status', '=', 1)->get();
return Response::json($awaitLists);
In my Notification model
public function Reservation() {
return $this->belongsTO('Reservation');
}
In my Reservation Model
public function notification() {
return $this->hasMany('Notification');
}
So notification belongs to reservation while reservation has a 1 to many relationship
My question is why can't what I have tried works. I keep getting Unknown column 'reservation.number' but i do have column called number in the reservations table. I know they is a way to use eloquent relationship mapper to do this.
This should do it:
$notifications = Notification::where('status','=',1)->get();
foreach($notifications as $notification) {
$id = $notification->id;
$num = $notification->reservation->number;
$await = [$id,$num];
var_dump($await);
}
The error you're seeing is because eager loading relationships doesn't actually perform a join. It uses two separate queries, and then the relationship fields are assigned after the queries are run.
So, when you do Notification::with('Reservation')->get(), it is running two SQL statements, approximately:
Notification::with('Reservation')->get();
// select * from notifications;
// select * from reservations where id in (?, ?, ...);
You can see the actual queries run with a dd(DB::getQueryLog()), if you're interested.
How you move forward depends on what you need to do. If you need to duplicate your existing query exactly, then you'll need to manually perform the joins.
$notifications = Notification::select('notifications.id', 'reservations.number')
->join('reservations', 'notifications.reservation_id', '=', 'reservations.id`)
->where('notifications.status', '=', 1)
->get();
foreach($notifications as $notification) {
print_r($notification->number);
}
Otherwise, you can just use the objects as they are built by Laravel:
$notifications = Notification::with('Reservation')->where('status', '=', 1)->get();
foreach($notifications as $notification) {
print_r($notification->Reservation->number);
}
Related
I have an accessor function for my User model which returns all the conversations of which a User is a participant.
public function getConversationsAttribute()
{
$results = DB::select('SELECT * FROM conversation_user WHERE user_id = ?', [$this->id]);
$conversations = array();
foreach($results as $result){
$conversation = Conversation::find($result->conversation_id);
array_push($conversations, $conversation);
}
return $conversations;
}
Now suppose I have two users $userA and $userB, how can I return the conversations of which both users are participants?
i.e., the common results between $userA->conversations and $userB->conversations
I imagine a UNION operator for duplicates is what is required.
What is the:
MySQL solution
Eloquent solution
Using intersect method of Laravel Collection, you can write
collect($userA->conversations)->intersect($userB->conversations);
How to write this code in eloquent method ?
$product = DB::table('products')
->join('purchase', 'products.id', '=', 'purchase.id')
->join('sales', 'purchase.id', '=', 'sales.id')
->select('sales.*', 'purchase.*','products.*')
->get();
Create model Product and add one to many relationship with Purchase in Product model.
public function purchases()
{
return $this->hasMany('App\Models\Purchase');
}
Create model Purchase and add one to many relationship with Sale in Purchase model.
public function sales()
{
return $this->hasMany('App\Models\Sale');
}
Create model Sale.
You can retrieve data using following statement.
$products = Product::with('purchases.sales')->get();
Note: I am assuming the relationship as one to many you can also declare as per your data, also you can define one to many inverse relationship, please refer to laravel docs https://laravel.com/docs/8.x/eloquent-relationships#one-to-many.
You will get purchases and sales data in different key so you can use below syntax to loop over it.
foreach ($products as $product) {
foreach ($product->purchases as $purchase) {
//Purchase data for current product
foreach($purchase->sales as $sale){
//Sale data for current purchase
}
}
}
I have 4 table categories, initiatives, a pivot table for the "Many To Many" relationship category_initiative and initiativegroup table related with initiatives table with initiatives.initiativesgroup_id with one to many relation.
With pure sql I retrive the information I need with:
SELECT categories.id, categories.description, initiatives.id, initiatives.description, initiativegroups.group
FROM categories
LEFT JOIN category_initiative ON categories.id = category_initiative.category_id
LEFT JOIN initiatives ON category_initiative.initiative_id = initiatives.id
LEFT JOIN initiativegroups ON initiatives.initiativegroup_id = initiativegroups.id
WHERE categories.id = '40'
How can I use eloquent model to achieve same results?
Since you have such a specific query touching multiple tables, one possibility is to use query builder. That would preserve the precision of the query, retrieving only the data you specifically need. That would look something like this:
$categories = DB::table('categories')
->select([
'categories.id',
'categories.description',
'initiatives.id',
'initiatives.description',
'initiativegroups.group',
])
->leftJoin('category_initiative', 'categories.id', '=', 'category_initiative.category_id')
->leftJoin('initiatives', 'category_initiative.initiative_id', '=', 'initiatives.id')
->leftJoin('initiativegroups', 'initiatives.initiativegroup_id', '=', 'initiativegroups.id')
->where('categories.id', '=', 40)
->get();
In your models define the relationships:
Category.php model
public function initiatives()
{
return $this->belongsToMany('App\Initiative');
}
Initiative.php model (If has many categories change to belongs to many)
public function category()
{
return $this->belongsTo('App\Category');
}
Then maybe change your initiativegroup -> groups table, and then create a pivot table called group_initiative. Create model for group. Group.php and define the relationship:
public function initiatives()
{
return $this->belongsToMany('App\Initiative');
}
Then you can also add the following relationship definition to the Initiative.php model
public function group()
{
return $this->belongsTo('App\Group');
}
That should get you started.
for the record..
with my original relationship, but changing table name as alex suggest, in my controller:
$inits = Category::with('initiative.group')->find($id_cat);
simple and clean
I would like to order result of eloquent by field on the other related table.
I have users table. Every user has one profile. Profile has sponsored (which is boolean) field. So when I would like to get all users, I want to display first sponsored users, then non sponsored.
public function profile(){
return $this->hasOne('App\Doctor');
}
There are two ways:
1)You have to join tables,
User::join('profiles','users.id','=','profile.user_id')->orderBy('sponsored','DESC')->get()
2)Order by eager loading
User::with(array('profile' => function($query) {
$query->orderBy('sponsored', 'DESC');
}))
->get();
Try this one
User::leftJoin('profile', 'user.id', '=', 'profile.user_id')
->orderBy('profile.sponsored', 'ASC')
->get();
I highly recommend not using table joins as it would fail you on the scale.
A better solution is to get users, get their profiles and then sort them using laravel collection methods.
You can use this sample to achieve this solution.
//get all users
$users = User::all();
//extract your users Ids
$userIds = $users->pluck('id')->toArray();
//get all profiles of your user Ids
$profiles = Profile::whereIn('user_id', $userIds)->get()->keyBy('user_id');
//now sort users based on being sponsored or not
$users = $users->sort(function($item1, $item2) use ($profiles) {
if($profiles[$item1->id]->sponsored == 1 && $profiles[$item2->id]->sponsored == 1){
return 0;
}
if($profiles[$item1->id]->sponsored == 1) return 1;
return -1;
});
You can check this link which explains on laravel collection sorts.
$order = 'desc';
$users = User::join('profile', 'users.id', '=', 'profile.id')
->orderBy('profile.id', $order)->select('users.*')->get();
I'm having two tables as 'jobs' and 'desired_skills'.
Table structure is as follows.
jobs table
jobs Table
desired_skills table
desired_skils table
where desired_skills.job_id refers to jobs.job id
In controller I have (I am getting $id as an argument from the url, and I can confirm the argument grabs the desired value)
$jobs = DB::table('jobs')->where(function ($query) use ($id) {
$query->Join('desired_skills', 'desired_skills.job_id', '=', 'jobs.job_id')
->where('jobs.employer_id', '=', $id);
->select('*')
})->get();
when I dump and die $jobs it only returns values from jobs table.
but when I run the query
SELECT * FROM jobs INNER JOIN desired_skills ON desired_skills.job_id = jobs.job_id it returns the desired value set.
What am I doing wrong? Any help will be greatly appreciated.
I think it has to do with wrapping your join inside of a where clause. I don't think it's giving you your desired query with that there.
$jobs = DB::table('jobs')
->join('desired_skills', 'desired_skills.job_id', '=', 'jobs.job_id')
->where('jobs.employer_id', '=', $id)
->get();
The query SELECT * FROM jobs INNER JOIN desired_skills ON desired_skills.job_id = jobs.job_id
is not the same has what you are trying to do in the function. In this query there is not
mention of 'employer_id' in the table 'jobs'.
An alternative would be to use eloquent relationships, as refered in a comment.
You need 3 classes in models:
Employer
Job
DesiredSkill
Between Employer and Job -> one-to-many relation (an employer can have multiple jobs).
Between DesiredSkill and Job -> one-to-one relation.
I'm not sure what you are trying to get from the join, but i think that if you implement
the methods that allow the relationships i believe you solve whatever.
class Job extends Model
{
public function employer()
{
return $this->hasOne('App\Job');
}
}
class Employer extends Model
{
public function jobs()
{
return $this->hasMany('App\Employer');
}
public function desiredSkill()
{
return $this->hasOne('App\DesiredSkill');
}
}
class DesiredSkill extends Model
{
public function job()
{
return $this->hasOne('App\DesiredSkill');
}
}
Try this:
$jobs = DB::table('jobs')
->join('desired_skills', 'desired_skills.job_id', '=', 'jobs.job_id')
->select('jobs.*', 'desired_skills.*')
->get();