I have a table called "categories" and there is a 3 table needed the id of categories
the 3 tables needed a categories id is "activies", "stories", "news" i really want to know how to fix this issue the stories and news table is running well im using php tinker to see if the relationship is running and the table activities it give me a null value, inside the activities table i`d input same category_id in the table of activities it gives always a null value given in php tinker
Models
Category.php
public function stories()
{
return $this->hasMany(Story::class);
}
public function news()
{
return $this->hasMany(Newy::class);
}
public function activites()
{
return $this->hasMany(Activity::class);
}
Activity.php
public function category()
{
return $this->belongsToMany(Category::class, 'category_id');
}
If you are using hasMany in your Category Model, the opposite relationship in your Activity model should be belongsTo() and not belongsToMany()
public function category()
{
return $this->belongsTo(Category::class);
}
You can read more in the documentation here
Related
I'm trying to retrieve related models of the same type on from a pivot table.
I have 2 models, App\Models\User and App\Models\Group and a pivot model App\Pivots\GroupUser
My tables are have the following structure
users
id
groups
id
group_user
id
user_id
group_id
I have currently defined relationships as
In app/Models/User.php
public function groups()
{
return $this->belongsToMany(Group::class)->using(GroupUser::class);
}
In app/Models/Group.php
public function users()
{
return $this->belongsToMany(User::class)->using(GroupUser::class);
}
In app/Pivots/GroupUser.php
public function user()
{
return $this->belongsTo(User::class);
}
public function group()
{
return $this->belongsTo(Group::class);
}
I'm trying to define a relationship in my User class to access all other users that are related by being in the same group. Calling it friends. So far I've tried this:
app/Models/User.php
public function friends()
{
return $this->hasManyThrough(
User::class,
GroupUser::class,
'user_id',
'id'
);
}
But it just ends up returning a collection with only the user I called the relationship from. (same as running collect($this);
I have a solution that does work but is not ideal.
app/Models/User.php
public function friends()
{
$friends = collect();
foreach($this->groups as $group) {
foreach($group->users as $user) {
if($friends->where('id', $user->id)->count() === 0) {
$friends->push($user);
}
}
}
return $friends;
}
Is there a way I can accomplish this using hasManyThrough or some other Eloquent function?
Thanks.
You can't do that using hasManyThrough because there is no foreign key on the users table to relate it to the id of the group_user table. You could try going from the user to their groups to their friends using the existing belongsToMany relations:
app/Models/User.php:
// create a custom attribute accessor
public function getFriendsAttribute()
{
$friends = $this->groups() // query to groups
->with(['users' => function($query) { // eager-load users from groups
$query->where('users.id', '!=', $this->id); // filter out current user, specify users.id to prevent ambiguity
}])->get()
->pluck('users')->flatten(); // massage the collection to get just the users
return $friends;
}
Then when you call $user->friends you will get the collection of users who are in the same groups as the current user.
So im trying to figure out how to use pivot tables in Laravel. And I have tried to read and understand the documentation. And I cannot understand why a user just can't balongTo a "department". I don't want a user to belongToMany "departments".
Departments model
public function users()
{
return $this->belongsToMany(User::class, 'department_user', 'user_id', 'department_id');
}
And for the user model, I want something like
public function department()
{
return $this->belongsTo(Department::class);
}
But Laravel reports null. Because department_id doesn't exist in the users row? How can I reverse this pivot table lookup, with belongsToMany and belongsTo?
I think you're getting confused with your relationship types. If I understand you correctly:
A Department hasMany Users.
A User belongsTo a Department.
This one-to-many relationship type does not need a pivot table and can be written as such:
class Department extend Eloquent
{
public function users()
{
return $this->hasMany(User::class);
}
}
class User extend Eloquent
{
public function department()
{
return $this->belongsTo(Department::class);
}
}
This would require that the users table have a department_id foreign key.
I have a table called invoiceDetails that has item_id as foreign key from another table called items which has category_id as foreign key from table called categories.
I want to do that following using eloquent:
$result = InvoiceDetail::groupBy('item_id')
->selectRaw('sum(qty) as qty, item_id')->with('item', 'category')->get();
but I am getting error:
Call to undefined relationship [category] on model [App\InvoiceDetail].
Here's my relation inside Category model:
public function invoiceDetail() {
return $this->hasManyThrough('App\InvoiceDetail', 'App\Item', 'category_id', 'item_id');
}
Any suggestions?
Not sure you would even need a hasManyThrough relation here, unless you want to fetch all InvoiceDatail objects belonging to all items which in turn belong to the Category. That part is not clear from your question.
But in your example you are fetching items with their category from distinct item_id.
The reason this is not working is because you are trying to fetch the category relation from the InvoiceDetail object, which does not exist.
->with('item', 'category')
You want to load the Category based on the item relation, not based on the InvoiceDetail, try the dot notation (given that you did define the other relations)
->with('item.category')
Relations should be like this:
class InvoiceDetail extends Model
{
public function item()
{
return $this->belongsTo(\App\Item::class);
}
}
class Item extends Model
{
public function invoiceDetails()
{
return $this->hasMany(\App\InvoiceDetail::class);
}
public function category()
{
return $this->belongsTo(\App\Category::class);
}
}
class Category extends Model
{
public function items()
{
return $this->hasMany(\App\Item::class);
}
public function invoiceDetails()
{
return $this->hasManyThrough(\App\InvoiceDetail::class, \App\Item::class, 'category_id', 'item_id');
}
}
You would want to use the hasManyThrough if, for example, you have a Category and you want to load all the InvoiceDetails directly.
dd($category->invoiceDetails);
I'm trying to implement a morphable table for categories, right now I've the following.
// Snippet Table
- id
- title
- body
// Post Table
- id
- title
- body
// Category Table
- id
- name
I want to be able to morph the posts and snippets to have only one category, something like this:
// Categorizable Table
- category_id
- categorizable_id
- categorizable_type
Do I have to have another model for this categorizable table? Or there is a way to set it without another model?
So far I have this
class Snippet extends Model
{
public function category()
{
return $this->morphOne(Category::class, 'categorizable');
}
}
class Post extends Model
{
public function category()
{
return $this->morphOne(Category::class, 'categorizable');
}
}
class Category extends Model
{
public function categorizable()
{
return $this->morphTo();
}
}
And I have 4 tables, snippets, posts, categories, categorizables, the last one the migration looks like this.
Schema::create('categorizables', function (Blueprint $table) {
$table->increments('id');
$table->unsignedInteger('category_id');
$table->morphs('categorizable');
$table->timestamps();
});
The thing is, what is the correct way to save this relationship, I'm testing it on tinker and bothattach($category_id) and sync($category_id) aren't saving the relationship they return the error BadMethodCallException with message 'Call to undefined method Illuminate\Database\Query\Builder::categorizable()', What I'm missing?
Sorry I thought you wanted many-to-many relationship. morphOne relationship API is the same as morphMany from the docs
Post extends Model
{
public function category() {
return $this->morphOne(Category::class, 'categorizable');
}
}
Category extends Model
{
public function categorizable() {
return $this->morphTo();
}
}
EDIT
When using morphOne you don't need a pivot table categorizables table must be deleted and change your categories table to include the morph fields
// Category Table
- id
- name
- categorizable_id
- categorizable_type
Let me first explain the relations of my table, and then I will explain what I cannot do.
So, I have an entity called "Company" it has many "Incomes" which has many "IncomeUnitSale" which has one "IncomeUnitSaleUnitPrice"
Company 1->* Income 1->* IncomeUnitSale 1->1 IncomeUnitSaleUnitPrice
Models:
Company Model
public function Income(){
return $this->hasMany('App\Income');
}
Income Model (table has "company_id")
public function Company(){
return $this->belongsTo('App\Company');
}
public function IncomeUnitSale(){
return $this->hasMany('App\IncomeUnitSale');
}
IncomeUnitSale Model (table has "income_id")
public function Income(){
return $this->belongsTo('App\Income');
}
public function IncomeUnitSaleUnitPrice(){
return $this->hasOne('App\IncomeUnitSaleUnitPrice');
}
IncomeUnitSaleUnitPrice (table has "income_unit_sale_id")
public function IncomeUnitSale(){
return $this->belongsTo('App\IncomeUnitSale');
}
What I am trying to do is the following:
$company = Company::where("id","=",1)->first();
$company->Income->IncomeUnitSale->IncomeUnitSaleUnitPrice
But It says its null, it works till $company->Income->IncomeUnitSale but after that doest't show any relation.
Can somebody please tell me what I am doing wrong?
Thank you!
hasMany relationships will always return an Eloquent Collection object. If there are no related records, it will just be an empty Collection. hasOne and belongsTo relationships will always return either the related Model, or null if there is no related model.
Because some of your relationships are hasMany, you have to iterate the returned Collection to be able to go further. So, instead of $company->Income->IncomeUnitSale->IncomeUnitSaleUnitPrice, you have to:
foreach($company->Income as $income) {
foreach($income->IncomeUnitSale as $sale) {
echo $sale->IncomeUnitSaleUnitPrice->price;
}
}