I have this database structure. 2 tables: shipment_out, stock_move.
shipment_out has the typical primary key integer id field.
stock_move has a field named shipment which is string type. This field can have these values:
"stock_shipment_out,1512",
"stock_shipment_in,65400",
"sale.line,358",
(...)
The thing is the table stock_move is related to a multiple tables based on the same field, so it has this text before.
In this case I want to define the relationship: shipment_out hasMany stock_move.
So I need to join by stock_move.shipment has this value: 'stock_shipment_out,{id}'.
So how can I define this relationship? Would be something like:
public function stockMoves()
{
return $this->hasMany(StockMove::class, 'shipment', 'stock.shipment.out,id');
}
I can achieve this relationship with query builder:
$shipments = ShipmentOut
::join('public.stock_move', DB::raw('CONCAT(\'stock.shipment.out,\',public.stock_shipment_out.id)'), '=', 'stock_move.shipment')
->where('stock_shipment_out.id', '=', $shipmentOut);
But I need on a relationship too...
To solve this problem I had to define a custom attribute, and then I can define the relationship with this field.
public function getStockMoveShipmentAttribute()
{
return "stock.shipment.out,{$this->id}";
}
public function stockMoves()
{
return $this->hasMany(StockMove::class, 'shipment', 'stock_move_shipment')
}
Now I can use this relationship, but it's only one-direction...
If I want to define the same relationship as the inverse it doesn't work.
I opened another question explaining it: Laravel relationship based on custom attribute not working both directions
Related
I have 3 DB table.
shows
show_genres
show_show_genre
In my show model, i have:
public function genres()
{
return $this->belongsToMany('App\ShowGenre');
}
So when i do:
$show=Show::find(1);
$show->genres give me collection with all genres that have show_id in shows_genres db.
I have also ShowGenre model where is all genres i have and i use.
Becouse i want to use sync for my genres, that names need to be in database.
But how can i find all shows that have genre id.
I couldn't find any way to get that list. Please help, thanks.
Edit:
You should do this other way around:
Have a model for Genre
your relationship method in Genre model should be
public function shows()
{
return $this->belongsToMany('App\Show', 'shows_genres');
}
belongsToMany accepts two parameters, model and pivot table name if not a standard name.
Your solution:
//Get genre 'strict'
//where could be followed by column name example:whereSlug, whereName
$strictGenre = Genre::whereName('strict')->first();
if($strictGenre)
{
//get shows of this genre
$strictShows = $strictGenre->shows;
}
Read manytomany relationships:
https://laravel.com/docs/6.x/eloquent-relationships#many-to-many
You may use
$show->genres()
->wherePivot('column', value)
->get();
By default Pivot table name must be singular : show_genre (without
plural s)
See docs
Assuming you have this relationship in your genres model
public function shows()
{
return $this->belongsToMany('App\Show', 'shows_genres', 'genre_id', 'show_id');
}
Then you can directly get all shows by genres id like this
$shows = Genre::find($id)->shows;
I'm learning Laravel and Laravel eloquent at the moment and now I try to solve a problem using relations in Laravel.
This is what I want to archive:
The database holds many sport clubs. A sport club has a lot of teams. Each team has games. The teams table has a column named club_id. Now I want to create Eloquent relations to get all games of a club.
Here is what I got so far:
Club model
id => PRIMARY
public function games()
{
return $this->hasMany('App\Models\Games')->whereHas('homeTeam')->orWhereHas('guestTeam');
}
Game model
home_id => FOREIGN KEY of team ; guest_id => FOREIGN KEY of team
public function homeTeam()
{
return $this->belongsTo('App\Models\Team','home_id')->where('club_id','=', $club_id);
}
public function guestTeam()
{
return $this->belongsTo('App\Models\Team','guest_id')->where('club_id','=', $club_id);
}
Team model
id => PRIMARY ; club_id => FOREIGN
In my controller all I want to do is Club::findOrFail($id)->games()
Executing the code above returns a SQL error that the games table does not have a column named club_id.
What is the correct way to create this kind of relation?
Thanks!
EDIT
Thanks to Nikola Gavric I've found a way to get all Games - but only where club teams are the home or away team.
Here is the relation:
public function games()
{
return $this->hasManyThrough('App\Models\Game','App\Models\Team','club_id','home_id');
}
How is it possible to get the games where the home_id OR the guest_id matches a team of the club? The last parameter in this function does not allow an array.
There is method to retrieve a "distant relationship with an intermediary" and it is called Has Many Through.
There is also a concrete example on how to use it which includes Post, Country and User, but I think it will be sufficient to give you a hint on how to create games relationship inside of a Club model. Here is a link, but when you open it, search for hasManyThrough keyword and you will see an example.
P.S: With right keys naming you could achieve it with:
public function games()
{
return $this->hasManyThrough('App\Models\Games', 'App\Models\Teams');
}
EDIT #01
Since you have 2 types of teams, you can create 2 different relationships where each relationship will get you one of the type you need. Like this:
public function gamesAsHome()
{
return $this
->hasManyThrough('App\Models\Games', 'App\Models\Teams', 'club_id', 'home_id');
}
public function gamesAsGuests()
{
return $this
->hasManyThrough('App\Models\Games', 'App\Models\Teams', 'club_id', 'guest_id');
}
EDIT #02
Merging Relationships: To merge these 2 relationships, you can use merge() method on the Collection instance, what it will do is, it will append all the records from second collection into the first one.
$gamesHome = $model->gamesAsHome;
$gamesGuests = $model->gamesAsGuests;
$games = $gamesHome->merge($gamesGuests);
return $games->unique()->all();
Thanks to #HCK for pointing out that you might have duplicates after the merge and that unique() is required to get the unique games after the merge.
EDIT #03
sortBy also offers a callable instead of a attribute name in cases where Collection contains numerical indexing. You can sort your Collection like this:
$merged->sortBy(function($game, $key) {
return $game->created_at;
});
When you define that Club hasMany games you are indicating that game has a foreign key called club_id pointing to Club. belongsTo is the same but in the other way. These need to be coherent with what you have on your database, that means that you need to have defined those keys as foreign keys on your tables.
Try this...
Club model
public function games()
{
return $this->hasMany('App\Models\Games');
}
Game model
public function homeTeam()
{
return $this->belongsTo('App\Models\Team','home_id');
}
public function guestTeam()
{
return $this->belongsTo('App\Models\Team','guest_id');
}
Your Query like
Club::where('id',$id)->has('games.guestTeam')->get();
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.
I know how to add another field to a pivot table
public function scheduledPrograms()
{
return $this->belongsToMany('ScheduledProgram', 'prog_bookings')->withPivot('paid','registered');
}
but how would I add a relation so for example if registered were another table with a hasOne relation that I could use to show the order_number and status and other fields, etc.
I've got a situation in a project where I need to form a relationship between a primary key on one table and an indexed column (not the primary key) on another. Here's a sample of the database layout:
courses table
id
level
resources table
id
courses_resources table
course_level
resource_id
In my CourseResource model I have the following:
public function courses(){
return $this->belongsToMany('Course', 'courses_resources', 'resource_id', 'course_level');
}
Which works fine.
Then in my Course model I have:
public function resources(){
return $this->belongsToMany('CourseResource', 'course_resources', 'course_level', 'resource_id');
}
Which doesn't work. When I look at the last query performed on the database, it appears Laravel is searching the course_level column using the course's ID. That makes sense, but is there any way to use the level column for this relationship?
Eloquent BelongsToMany depends on PKs, so there is no way to do that with its methods.
You need custom relation object for this, that will check for given field, instead of primary key.
A quick and hacky solution would be this:
// Course model
public function getKey()
{
$relation = array_get(debug_backtrace(1, 2), '1.object', null);
if (method_exists($relation, 'getForeignKey')
&& $relation->getForeignKey() == 'courses_resources.course_level')
{
return $this->getAttribute('level');
}
return parent::getKey();
}
However if you would like to use it in production, do some extensive testing first.