I've never studied Eloquent. I am studying APIs and I want to get some data as kickly as possible, without writing sql, what is I usually do.
I have the tables: "house" related to "announcement" (one to one) and the "announcement" table is related to "advertiser" (one to many).
When I tried
$house = \App\House::where('house_id', $id)->with('announcement', 'advertiser')->first();
I get the error: announcement undefined method.
I think I set up the relationship on the models correctly so I didn't include them here. I want to join using the model House because I am not using the default connection when using Eloquent.
with() must be placed at first, and specify your relationships in an array (if you load more than one)
$house = \App\House::with(['announcement', 'advertiser'])->where('house_id', $id)->first();
Edit :
Sorry, i haven't seen that it's a nested relationship
You can use this code instead of the above one :
$house = \App\House::with(['announcement', 'announcement.advertiser'])->where('house_id', $id)->first();
for a nested relationship use dot like announcement.advertiser
$house = App\House::with(['announcement', 'announcement.advertiser'])->where('house_id', $id)->first();
Related
I have Book, Magazine and Song models.
I want to make a Collection model that will contain models of these three types, so I could query it like this (pseudo code):
Collection->get()
and get a result similar to this:
[
{Book_1}
{Magazine_1}
{Book_2}
{Song_1}
{Book_3}
...
]
Is it possible to do in Laravel, and how would I approach this problem?
I looked at polymorphic relations, but, as I understand it, it's only possible to get one type of relationship at a time (books(), magazines(), songs()) and not a mix of them.
A collection is already a "thing" (like a keyword) in Laravel, it's a wrapper class for arrays. Perhaps you could use something like "Media". If all tables have the same columns you could use union Or create 3 queries and concat the results.
$books = Book::all();
$songs = Song::all();
$magazines = Magazine::all();
$media = collect([$books, $songs, $magazines]);
I have 3 tables:
clinics
departments
clinics_in_departments
Using Query Builder:
$department = ClinicsInDepartment::whereIn('clinic_id',[1,2,3])
->join('departments', 'clinics_in_departments.department_id', '=', 'departments.id')
->get();
How can this be done with the relationship, and is it worth it?
If you look at the documentation of Laravel at the Many to Many section https://laravel.com/docs/5.6/eloquent-relationships#many-to-many it's already explained in there. If you're planning to keep using Laravel I would recommend using the best practises of Eloquent. It's easier to understand and read for other developers. It's always worth to make your product the best you can. It also gives possibilities to quickly extend and maintain your application.
All you need to do is to define a relationship in your model clinics
// second, third and fourth parameter could also be optional
function departments(){
return $this->belongsToMany('App\Clinics', 'clinics_in_departments', 'department_id', 'clinic_id');
}
To retrieve the data you can use
$clinics = Clinics::with('departments')->get();
// this would hold a list of departments for each clinic
To get exactly the same data extend the query to this
$clinics = Clinics::with('departments')->whereIn('clinic_id',[1,2,3])->get();
Because it's a Many to Many relationship you could also define a relationship for the model Departments and do exactly the same as mentioned above.
You can define a belongs to many relation inside Clinics model like below code
function departments(){
return $this->belongsToMany('App\Clinics', 'clinics_in_departments');
}
as the title says I'm trying to access to a row that it's related to a one to one relationship, I've tried with the method that is in my model but it only works when the result isnt a collection, it maybe needs a more complicated consult, do you have any ideas how to do it with eloquent
Empresa model
public function transferencias_recibidas()
{
return $this->belongsToMany('App\Transferencia_recibir', 'empresa_transferencia_recibir', 'empresa_id', 'transferencia_recibir_id');
}
Transferencia_recibir model (the inverse of a hasOne relation)
public function transferencia()
{
return $this->belongsTo('App\Transferencia');
}
This is what i get, a collection
This is what a need for each one of them
$a=$empresa->transferencias_recibidas->find(1)->transferencia
Thx for the help guys
The eloquent relationship are "lazy loaded", meaning they will only load their relationship data when you actually access them. The output you shown are expected because you did not accessed that relationship, but you can load that relationship in two ways:
access it when needed:
$empresa->transferencias_recibidas->first()->transferencia;
"Eager load" all the transferencia relationship
Empresa::with('transferencias_recibidas.transferencia')->where([ .. ])->get();
The second method alleviates the N + 1 query problem. Since the first method executes N queries to retrieve all relationship, instead of a query to retrieve all the relationship for the second method.
You may need to check eager loading section.
Ok so i'm kind of newish to eloquent and laravel (not frameworks tho) but i hit a wall here.
I need to perform some queries with conditions on different tables, so the eager load (::with()) is useless as it creates multiples queries.
Fine, let use the join. But in that case, it seems that Laravel/Eloquent just drops the concept of Object-relationship and just return a flat row.
By exemple:
if i set something like
$allInvoicesQuery = Invoice::join('contacts', 'contacts.id', '=', 'invoices.contact_id')->get();
and then looping such as
foreach ($allInvoicesQuery as $oneInvoice) {
... working with fields
}
There is no more concept of $oneInvoice->invoiceFieldName and $oneInvoice->contact->contactFieldName
I have to get the contacts fields directly by $oneInvoice->contactFieldName
On top of that the same named columns will be overwrited (such as id or created_at).
So my questions are:
Am i right assuming there is no solution to this and i must define manually the field in a select to avoid the same name overwritting like
Invoice::select('invoices.created_at as invoice.create, contacts.created_at as contact_create)
In case of multiple joins, it makes the all query building process long and complex. But mainly, it just ruins all the Model relationship work that a framework should brings no?
Is there any more Model relationship oriented solution to work with laravel or within the Eloquent ORM?
Instead of performing this join, you can use Eloquent's relationships in order to achieve this.
In your Invoice model it would be:
public function contact(){
return $this->belongsTo('\App\Contact');
}
And then of course inside of your Contact model:
public function invoices(){
return $this->hasMany('\App\Invoice');
}
If you want to make sure all queries always have these active, then you'd want the following in your models:
protected $with = ['Invoice']
protected $with = ['Contact'];
Finally, with our relationships well defined, we can do the following:
$invoices = Invoice::all();
And then you can do:
foreach($invoices as $invoice)[
$invoice->contact->name;
$invoice->contact->phone;
//etc
}
Which is what I believe you are looking for.
Furthermore, you can find all this and much more in The Eloquent ORM Guide on Laravel's site.
Maybe a bit old, but I've been in the same situation before.
At least in Laravel 5.2 (and up, presumably), the Eloquent relationships that you have defined should still exist. The objects that are returned should be Invoice objects in your case, you could check by dd($allInvoiceQuery); and see what the objects are in the collection. If they are Invoice objects (and you haven't done ->toArray() or something), you can treat them as such.
To force only having the properties in those objects that are related to the Invoice object you can select them with a wildcard: $allInvoicesQuery = Invoice::select('invoices.*')->join('contacts', 'contacts.id', '=', 'invoices.contact_id')->get();, assuming your corresponding table is called invoices.
Hope this helps.
I'm trying to get 'related' linked models by querying a link table, named company_projects which holds (as you expect) the id's of companies and projects (projects are kind of product-categories).
In this case, the used flow to determine a related project is:
Get companies who are in the same project ('product category') as you
Find the other project id's which are linked to those companies
Get the info of the linked projects fetched by last step
What i'm trying to do is already functional in the following raw query:
SELECT
*
FROM
projects
WHERE
projects.id IN
(
SELECT cp1.project_id
FROM company_projects cp1
WHERE cp1.company_id IN
(
SELECT cp1.company_id
FROM projects p
LEFT JOIN company_projects cp2 ON cp2.project_id = p.id
WHERE p.id = X AND cp2.company_id != Y
)
)
AND projects.id != X
X = ID of current project ('product category')
Y = ID of current 'user' (company)
But my real question is, how to do this elegantly in Laravel Eloquent (currently v4.2). I tried it, but I have no luck so far...
Update:
I should note that I do have experience using Eloquent and Models through multiple projects, but for some reason I just fail with this specific query. So was hoping to see an explained solution. It is a possibility that I'm thinking in the wrong way and that the answer is relatively easy.
You will need to utilize Eloquent relationships in order to achieve this. (Note that I am linking to the 4.2 docs as that is what you are using, but I would highly suggest upgrading Laravel to 5.1)
I am assuming you have a 'Company' and 'Project' model already. Inside each of those models, you need to a define a method that references its relationship to the other model. Based on your description, it sounds like the two have a Many to Many relationship, meaning that a company can have many projects and a project can also belong to many companies. You already have a database table linking the two. In the Eloquent ORM this linking table is called a pivot table. When you define your relationships in the model, you will need to pass the name of that pivot table as your second argument. Here's how it could look for you.
Company model:
class Company extends Model
{
/**
* Get the projects attached to a Comapny. Many To Many relationship.
*/
public function projects()
{
return $this->belongsToMany('Project','company_projects');
}
}
Project model:
class Project extends Model
{
/**
* Get the companies this project belongs to. Many To Many relationship.
*/
public function companies()
{
return $this->belongsToMany('Company','company_projects');
}
}
If your models have these relationships defined, then you can easily reference them in your views and elsewhere. For example, if you wanted to find all of the projects that belong to a company with an ID of 1234, you could do this:
$company = Company::find(1234);
$projects = $company->projects;
Even better, you can utilize something called eager loading, which will reduce your data lookup to a single line (this is mainly useful when passing data to views and you will be looping over related models in the view). So those statements above could be rewritten as:
$company = Company::with('projects')->find(123);
This will return your Company model with all its related products as a property. Note that eager loading can even be nested with a dot notation. This means that you can find all the models that link to your main model, and then all the models for those models, and so on and so forth.
With all of this in mind, let's look at what you specifically want to accomplish.
Let us assume that this method occurs in a Controller that is being passed a project id from the route.
public function showCompaniesAndProjects($id)
{
//Get all companies in the same project as you
//Use eager loading to grab the projects of all THOSE companies
//Result will be a Project Object with all Companies
//(and those projects) as Eloquent Collection
$companies = Project::with('companies.projects')->find($id);
//do something with that data, maybe pass it to a view
return view('companiesView')->with('companies',$companies);
}
After defining your relations in your models, you can accomplish that whole query in a single line.