I am trying to get all attributes in one JSON.
Eg:
Consider I have a table "place" with "id","name","description" as attributes.
Now,
I have another table "region" with "id","name","place_id","description" as attributes(or) schema.
There is one to many relationship between place and region.
And now,I define another table "street" with "id","name","region_id" as its schema.
There is again One to Many relationship between "region" and "street".
I want to get all details which comes in one place.If there is some place "1,banglore,garden city" and there are two regions with that place_id as
"{"1,r.t.nagar,1,region in banglore"},{"2,ashok nagar,1,region in banglore"}".Here "1" is foreign key referring id of "banglore's id(1)".
Now,similarly if each region has 3 streets in street table.I want to get all the values in one JSON. I know that we can get this with foreach .But,i want an efficient solution to get all nested relationship to my Place model from Region,Street in JSON.
Thanks.
You first need to define one to many relations like:
class Places extends Eloquent{
....
public function regions()
{
return $this->hasMany('App\Region');
}
...
}
And the same to streets:
class Regions extends Eloquent{
....
public function streets()
{
return $this->hasMany('App\Street');
}
....
}
Note that I have assumed that your models stay within App folder and have corresponding namespaces.
After that you can get you model like:
Place::with('regions.streets')->get();
Which will automatically nest all relations and cast to JSON if you send a json response.
Related
I am currently working on a desktop management application with laravel 5.6. According to the management rule a patient can have one or more consultations according to given dates. When I display the list of consultations, I have the same name that repeats, the name that repeats corresponds to the patient who had several consultations, my question of how to avoid this. What I want is the name, and all the dates for these consultations.
class Consultation extends Model
{
public function patient()
{
return $this->belongsTo('App\Models\Patient');
}
}
class Patient extends Model
{
public function consultations()
{
return $this->hasMany('App\Models\Consultation');
}
}
Here is the query :
$consultations = Consultation::all();
The simplest (but not the prettiest) way to do this is to simply find all patients with consultations. Put those patients in an array, and then in your blade you would loop through these patients and show the consultations individually.
Controller Code:
$active_patients = [];
foreach(Patient::all() as $patient) {
if($patient->consultations->count()>0)
array_push($active_patients,$patient);
}
Pass $active_patients to your view, then loop over it as shown below. Obviously, I don't know all of the attribute names for your Patient or Consultation models and you will need to fix html markup as required, but you can get the picture:
#foreach($active_patients as $patient)
<p>{{$patient->name}}:</p>
#foreach($patient->consultations as $consultation)
<p>{{$consultation->date}}</p>
#endforeach
#endforeach
Disclaimer: This is not the most robust way to do this. It's simply the most straightforward approach. The best way to do this is to use scoped queries combined with appended attributes. For instance, you would make a scope on the Patients model for all patients that have a consultation by using the 'whereHas' eloquent query method to find patients that have consultations scheduled. Then you could just reference them directly as ActivePatient rather than having to build an array each time you reference them. You could also append an attribute to the Consultations model that does the same thing and grabs each consultation for the specific users and makes a nested model collection, but that's much more involved. I'd be happy to share that method with you if you want, but the above code would at least provide you with a working method to achieve what you requested.
I have 3 databases:
Routes:
id
name
Rates:
Id
Route_id
Car_id
Cars:
id
name
My model for routes
public function rates()
{
return $this->hasMany('App\Rate', 'route_id');
}
My model for rates
public function car() {
return $this->belongsTo('App\Car','car_id');
}
Now I need to access the car relation, but when I do
return $this->route->with('from','to','rates.car')->paginate(74);
I get null for the car relation
{"id":1,"from_id":1,"to_id":2,"distance":400,"created_at":null,"updated_at":null,"from":{"id":1,"name":"\u0410\u043a\u043a\u043e","created_at":null,"updated_at":null,"lat":32.93310000000000314912540488876402378082275390625,"long":35.0827000000000026602720026858150959014892578125},"to":{"id":2,"name":"\u0410\u0440\u0430\u0434","created_at":null,"updated_at":null,"lat":31.261399999999998300381776061840355396270751953125,"long":35.21490000000000009094947017729282379150390625},"rates":[{"id":1,"route_id":1,"car_id":1,"rate":1123,"night_rate":1391,"car":null},{"id":5551,"route_id":1,"car_id":2,"rate":1123,"night_rate":1391,"car":null},{"id":11101,"route_id":1,"car_id":3,"rate":1123,"night_rate":1391,"car":null},{"id":16651,"route_id":1,"car_id":4,"rate":1123,"night_rate":1391,"car":null},{"id":22201,"route_id":1,"car_id":5,"rate":1123,"night_rate":1391,"car":null},{"id":27751,"route_id":1,"car_id":6,"rate":1123,"night_rate":1391,"car":null},{"id":33301,"route_id":1,"car_id":7,"rate":1123,"night_rate":1391,"car":null},{"id":38851,"route_id":1,"car_id":8,"rate":1123,"night_rate":1391,"car":null}]},
From my understanding you are trying to access a Car model through a Route model.
A couple of things I noticed that should help you find a solution.
First off I think the inverse relation you are supposed to use the belongToMany() function instead.
public function car() {
return $this->belongsToMany('App\Car','Rates'); // Perhaps call the table something like routes_cars to more clearly define it's a pivot table
}
Next I see you are trying to use model functions within the context of $this(). I assume you are doing this in your model? That logic should be in a controller, that might cause some undesired results but I'm not entirely sure. Also it looks like your parameters are incorrect when using with(). You use the function name that you defined in belongsToMany()
App/Route::with('car')->paginate(74);
With the correct relationships setup you rarely need to worry about the pivot table. If you are going to add extra information in the pivot table there are laravel functions to help you do that in the documentation.
I have been trying to get my head around these polymorphic relationships all day. I might be over complicating/thinking it but. Can Laravel handle inverse polymorphic relationships? I have a registration flow that can have two types of field Models- normal field and customField.
When I loop through all the fields available it could pull the attributes from either NormalField or CustomField.
<?php
foreach($registrationFlow->fields->get() as $field)
{
echo $field->name; // could be custom field or could be normal field
}
?>
My difficulty is that, the example given in the docs works if you want to assign a photo to either staff or orders, but i want to assign either a customField or a normalField to a registrationFlow
*Edit
If you follow the example for the polymorphic many to many relationship, The tag class contains posts and videos- while i would want just a simple fields() method that relates to customField or normalField dependent on the type
First of all, you should take a look at the updated docs for Laravel 5.1: https://laravel.com/docs/5.1/eloquent-relationships#polymorphic-relations.
I think the difficulty with the example they provide is that the relationship between Photo and Staff/Product are "has-a" relationships, whereas you are trying to model an "is-a" relationship. However, you can model "is-a" essentially the same way. Take a look at this article: http://richardbagshaw.co.uk/laravel-user-types-and-polymorphic-relationships/.
Basically, the strategy is to define a generic model (and a generic table), perhaps in your case Field, that relates to your RegistrationFlow. You then have two subtype models, NormalField and CustomField, that have one-to-one relationships with Field. (there's your "is-a"). Thus, RegistrationFlow is indirectly related to your field subtypes.
Polymorphism comes in when you want to access the specific subtypes:
class Field extends Model {
public function fieldable()
{
return $this->morphTo();
}
}
Your base field table should have fieldable_id and fieldable_type columns defined (see the Eloquent docs).
You can then add methods to NormalField and CustomField that let you access the base model (your "inverse relationship"):
class NormalField {
public function field()
{
return $this->morphOne('Field', 'fieldable');
}
}
class CustomField {
public function field()
{
return $this->morphOne('Field', 'fieldable');
}
}
Usage:
$field = Field::find(1);
// Gets the specific subtype
$fieldable = $field->fieldable;
I have four tables in database: groups, specialties, lessons, group_lesson. It's structures:
groups
id
specialty_id
name
specialties
id
name
lessons
id
specialty_id
group_lesson (UNIQUE INDEX lesson_id, group_id)
lesson_id
group_id
date
My models look like that for now:
class Group extends Eloquent {
public function specialty() {
return $this->belongsTo('Specialty');
}
}
class Lesson extends Eloquent {
public function specialty() {
return $this->belongsTo('Specialty');
}
}
class Specialty extends Eloquent {
public function lessons() {
return $this->hasMany('Lesson');
}
public function groups() {
return $this->hasMany('Group');
}
}
I need get additional fields in Group model look like that
Group - Eloquent model
name - string
lessons - collection of Lesson models of Group Specialty
date - date from group_lesson table
I've tried different relationships and combinations, but it's doesn't work. Please help me to write correct relationships.
You can use eager-loading to access relational data through relationships, and can even chain relationships further. As a rule of thumb, if you can draw a path to from 1 model to another through a relationship, you can eagerload all the relevant and relational data for that with chained eager-loads.
Laravel Eager Loading
As an example
$speciality_group = Speciality::with('group','lessons')->find($id);
Even though you are only getting a single instance of the speciality model, the related data is hasMany, meaning multiple records. You need to loop through these records using a foreach loop to access the relevant data for them, or alternitavely add additional closures in your initial query to load only a single related model.
foreach($speciality_group->group as $group)
{
echo $group->name;
}
You will need to do this for both instances where you want to display related information.
History:
DB: Tables clients and titles
A Client can have many titles but a title can only have one client. So i will use a simple one-to-many relationship as illustrated below:
Client Model
class Client extends Eloquent {
public function titles(){
return $this->hasMany('titles');
}
}
Then i simply use the following to get the requested data for the selected title
$clientTitles = Client::find(1)->titles;
All in all this should list all client associated titles.
My question really comes to this as i am looking to split my data within my titles table into smaller tables as i also use some aspects of the titles data somewhere within the system and do not need to get all of the title details every time.
So i would have another three tables related to the titles data table
Titles, Title_Artwork, Title_Details, Titles_List
Now if i use the same as above i will get all the data within the titles table, but not the other three. So how can i then update my relationship to then scrape the other three title tables so when i need to, i can get all the data, rather.
Or is there another way to do this or NO keep to what i have done an just limit the call to the fields i require?
From what I understood, And lets assume that your Titles model is some what like-
class Titles extends Eloquent{
public function titleartwork(){
return ..
}
public function titledetails(){
return ..
}
public function titlelist(){
return ..
}
}
And your client model is-
class Client extends Eloquent {
public function titles(){
return $this->hasMany('titles');
}
}
So in order to get the data of any of these tables Title_Artwork, Title_Details, Titles_List
you can do this
$clientTitles = Client::with('Titles','Titles.titleartwork','Titles.titlelist')->where('id','=',1)->get();
In terms of Laravel it is known as Eager Loading, to know more you can check the doc
It will also work with multiple nesting, I mean if your Title_Artwork also contains relationship like-
class TitleArtwork extends Eloquent{
public function sometable(){
return ..;
}
}
Then you can get the data of sometable using
$clientTitles = Client::with('Titles','Titles.titleartwork.sometable','Titles.titlelist')->where('id','=',1)->get();