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Laravel relationships - are there multiple *unnecessary* database calls?


Laravel relationships - are there multiple *unnecessary* database calls?

By : tolgun
Date : November 21 2020, 03:00 PM
fixed the issue. Will look into that further Laravel provides a feature called Eager Loading which lets you load the model and any relationships by optimizing the queries:
code :
Post::with('user')->find($id);
User::with('posts')->find($id);


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Using Hibernate/JPA without relationships and avoiding multiple DB calls

Using Hibernate/JPA without relationships and avoiding multiple DB calls


By : Christopher Shivers
Date : March 29 2020, 07:55 AM
will help you If you want to avoid relationships then you lose a significant advantage of JPA. However, you can still do what you want with Native SQL which is supported by Hibernate.
Why do Laravel relationships prevent calls to query builder methods?

Why do Laravel relationships prevent calls to query builder methods?


By : burak
Date : March 29 2020, 07:55 AM
This might help you The reason your code doesn't work is all Eloquent relationship declaration returns different result depending on whether you are trying to access the relationship as property or as method (with () or without ()).
code :
// Return you chainable queries    
$query = User::find(1)->patients()->... 
// Return you collection of patients
$patientsCollection = User::find(1)->patients;
Database Relationships in Laravel

Database Relationships in Laravel


By : Jan
Date : March 29 2020, 07:55 AM
will be helpful for those in need Your relationship is setup incorrectly. The table that has the key pointing to another table, belongs to that other table.
code :
class Author ... 
{
    public function role()
    {
        return $this->belongsTo(Role::class);
    }
    ...
Laravel's performance and database usage - connections unnecessary?

Laravel's performance and database usage - connections unnecessary?


By : jmlee
Date : March 29 2020, 07:55 AM
Any of those help Short answer: Don't be worried. For most applications there won't be an issue.
Long answer: If you look into the framework level code a bit and see how laravel actually handles the request when you call Auth::User() you will see that for the authenticated user every request goes through SessionGuard which immediately returns the user instead of making a database call.
code :
public function user()
{
    if ($this->loggedOut) {
        return;
    }
    // If we've already retrieved the user for the current request we can just
    // return it back immediately. We do not want to fetch the user data on
    // every call to this method because that would be tremendously slow.
    if (! is_null($this->user)) {
        return $this->user;
    }
laravel database query with multiple relationships

laravel database query with multiple relationships


By : user3148320
Date : March 29 2020, 07:55 AM
will be helpful for those in need I would like to load posts from users of a certain age from the database. The user can save the minimum(users->profile->min_age) and maximum age(users->profile->max_age) in his profile. , You can add this constraint to your posts query:
code :
// TODO: set these from current user
$minAge = 25;
$maxAge = 28;

$posts = Post::query()
    ->where('type', 7)
    ->where('user_id', '!=' , auth()->id())
    ->whereIn('gender', [0,1])
    ->whereNotExists(function ($query) {
        $query->select(DB::raw(1))
            ->from('users_finder')
            ->whereColumn('users_finder.post_id', 'posts.id')
            ->where('users_finder.user_id', auth()->id());
    })
    ->whereHas('user', function ($query) use ($minAge, $maxAge) {
        $query->whereRaw('timestampdiff(YEAR, birthday, CURRENT_TIMESTAMP) >= ?', [$minAge])
            ->whereRaw('timestampdiff(YEAR, birthday, CURRENT_TIMESTAMP) <= ?', [$maxAge]);
    })
    ->first();
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