in a Laravel application, I have a list of companies. Some of those are related to a subscriptions table in a 1 x n relation.
I want to order the companies in a way that the ones which have a subscription appear before the ones which have no subscription using just one db query.
Any idea is much appreciated!
thanks!
Laravel uses separate queries to eager load relationships. So if you want to do this you will need to join the tables and order by...
Something in the form...
$companies = App\Companies::join('subscriptions as sub', 'sub.company_id', '=', 'company.id')
->orderBy('sub.somefield', 'DESC')
->select(what you need)
->with('if you need the relation data');
You know you can also only query those records that have a relationship with
$companies = App\Companies::has('subscription')->get();
Maybe that is all you need... and
$companies = App\Companies::doesntHave('subscription')->get();
... returns the opposite where the company has no subscription...
Related
I have problem with my eloquent query, i need to use data of my base model into whereRelation.
I tried this query bottom, but results was not what i except. The query return me all users who have one city relation, not only user who have city updated between my last user sync.
$users = People::whereRaw('TIMESTAMPDIFF(SECOND, people.latest_sync, people.updated_at) > 20')
->orWhereRelation('city', 'updated_at', '>', 'people.updated_at')
->get();
I'v tried people.updated_at and latest_sync in value of my Where Relation
Do i need to make pure SQL Raw query with classic join ?
PS: the first whereRaw is ok, and work (i really need)
I have tables students, profiles, subjects and pivot table profile_subject
-students---------{id,profile_id,year}
-profiles---------{id}
-profile_subject--{profile_id,subject_id,year}
-subjects---------{id}
I want to select a student with id 5, and eager load profile and subjects for the students year.
Something like this:
$student = Student::with('profile','profile.subjects')->find(5);
But I also have to insert the condition
->wherePivot('year','=','students.year')
there somewhere. How to do that?
This query will not do the job cos it will search for records which year is "students.year" literary
Use lazy eager loading. This code will not create any additional queries, it'll create the same amount of queries as with() would:
$student = Student::find(5);
$sudent->load(['profile', 'profile.subjects' => function ($q) use ($student) {
$q->wherePivot('year', $student->year);
}]);
I have a Laravel 4.2 site with a pretty simple database layout. The important part is a People model and a Subject model that have a many-to-many relationship. This works, so that, for instance:
$id = 5;
$ppl = Subject::find($id)->people()->orderBy('lastname')->get();
Returns all People for a given Subject. What I'm trying to do is instead of finding all the People for a single subject, to find all the people for multiple subjects. My guess was something like this:
$subjects = array(5, 6, 7);
$ppl = Subject::whereIn('id', $subjects)->people()->orderBy('lastname')->get();
That doesn't work (undefined method people()). Neither does the following (undefined property people):
$ppl = Subject::whereIn('id', $subjects)->people->orderBy('lastname')->get();
I'm currently just using raw SQL t get around this. How can I use eloquent relationships with where() or whereIn() calls on a model? Or, is there just a better eloquent way of approaching this problem.
Edit: Here's the raw SQL I used to get a list of the people.id's for a given array of subjects:
SELECT
DISTINCT(people.id)
FROM people
LEFT JOIN person_subject ON person_subject.person_id=people.id
WHERE
person_subject.subject_id IN (%s) AND
deleted_at IS NULL
Your eloquent relationships should allow you to eagar load the people related to a subject, you can do something like this:
Subject::whereIn('id', $subjects)->with('people')->orderBy('lastname')->get();
This will return your people related to the subjects.
Let me know if this doesn't work.
What you need is to join the tables to order by the lastname:
$ppl = Subject::whereIn('id', $subjects)
->select('subjects.*')
->distinct()
->join('people', 'people.id', '=', 'subjects.people_id')
->orderBy('lastname')
->get();
Check all your tables names because I don't know them and above are just an example one.
I have four models: Item, Car, ItemLocation and Branch.
An Item has a Car and a ItemLocation via a person_id and a item_location_id field in the DB.
A Car has a branch_id which links to Branch, and an ItemLocation also has a branch_id in the same way.
What I want to do is to select all Items where their Cars's branch is not equal to their ItemLocation's branch.
I tried this statement, though I knew that it wouldn't work:
Item::with('car','item_location')
->where('car.branch_id', '<>', 'item_location.branch_id')
->get();
I'm aware of querying on relationships, but don't understand how to do that across relationships like this.
Any ideas?
Querying relationships won't help you, since you want to compare values from separate tables. You need joins:
$items = Item::select('items.*')
->join('item_locations as il', 'il.id', '=', 'items.item_location_id')
->join('cars', function ($j) {
$j->on('cars.person_id', '=', 'items.id')
->on('cars.branch_id', '<>', 'il.branch_id');
})
->get()
This will fetch all the items having both cars and item_location and matching your criteria. If you want to include also ones that don't have either of the relations, then use leftJoins instead and whereNull('cars.id')
ps. It's hard to read your question. Instead of describing these relationships, better simply show the tables with relevant fields.
Some help with many to many relationships in Laravel:
Using the example for roles and users - basically:
a table for all the roles
a table for the users
and table with user_id and role_id.
I want to add to the third table, eg Year. basically the pivot table will have user_id, role_id and year_id.
I want to be able to make a query to pull for example all users assigned a specific role in a specific year. Eg All users with role_id = 2, and year_id = 1.
Any help will be appreciated
Before answering, I would like to suggest you not to put year on database like this.
All your tables should have created_at and updated_at which should be enough for that.
To filter users like you want. You could do this:
// This queries all users that were assigned to 'admin' role within 2013.
User::join('role_users', 'role_users.user_id', '=', 'users.id')
->join('roles', 'roles.id', '=', 'role_users.role_id')
->where('roles.name', '=', 'admin')
->where(DB::raw('YEAR(role_users.created_at)', '=', '2013')
->get();
This example may not be the precise query you are looking for, but should be enough for you to come up with it.
The best way to achieve a three way relation with Eloquent is to create a model for the table representing this relation. Pivot tables is meant to be used for two way relations.
You could have then a table called roles_users_year which could have data related to this 3 way relation like a timestamp or whatever...
A very late answer to a very old question, but Laravel has supported additional intermediate (pivot) table columns of at least Laravel 5.1 judging from the documentation, which hasn't changed at least through Laravel 6.x.
You can describe these extra columns when defining your many-to-many relationship:
return $this->belongsToMany(Role::class)->withPivot('column1', 'column2');
or in your case, the below would also do the job:
return $this->belongsToMany(Role::class)->withTimestamps();
which you can then access via the pivot attribute on your model:
$user = User::find(1);
foreach ($user->roles as $role) {
echo $role->pivot->created_at;
}
Note that the pivot attribute is on the distant relationship model (a single Role) and not on the relationship itself.
To get all the Roles assigned to Users in any given year, you might create a special relationship:
// User.php
public function rolesInYear($year) {
return $this->belongsToMany(Role::class)
->wherePivot('created_at', '>=', Carbon::create($year))
->wherePivot('created_at', '<', Carbon::create($year + 1));
}