Laravel querying data through a pivot table - php

Question

I have a table called 'projects' and a table called 'tags'. These 2 are connected through a pivot table named 'project_tag' so for example like this:
There is 1 record in the projects table with project_id 1
then in the 'project_tag' table there is this :
project_id 1 and tag_id 1
and tag_id 1 is "sometag" for example
Now my problem is I want to query all the projects that has "sometag" as name in the tags table.
Is there a way to do this? Or should I work with the id's instead of the tag values?
What my models look like:
Project model:
public function tags()
{
return $this->belongsToMany('App\Tag')->withTimestamps();
}
Tag model:
public function projects()
{
return $this->belongsToMany('App\Project');
}
I am a bit lost in my database structure :) I am fairly new to laravel
Many thanks in advance!

Answer 1

Assuming your model is called Project and your project-tag relationship is called tags(), this should work out for you:
Project::whereHas('tags', function ($query) {
$query->where('name', 'like', '%sometag%');
})->get();

Answer 2

To query projects by certain tags you ca do like this:
// Get projects by a single tag
$tag = 'mytag';
Project::whereHas('tags', function ($q) use ($tag) {
$q->whereName($tag);
// or $q->whereSlug($tag);
})->get();
// Get projects by multiple tags
$tags = ['mytag', 'othertag', 'iamtag'];
Project::whereHas('tags', function ($q) use ($tags) {
$q->whereIn('name', $tags);
})->get();
Or you can query projects from pivot table like this:
// Get projects by a single tag
$tag_id = 1;
Project::whereIn('id', function($q) use ($tag_id) {
$q->select('project_id')->from('project_tag')->where('tag_id', $tag_id);
})->get();
// Get projects by multiple tags
$tag_ids = [1, 2, 3];
Project::whereIn('id', function($q) use ($tag_ids) {
$q->select('project_id')->from('project_tag')->whereIn('tag_id', $tag_ids);
})->get();

Answer 3

Adding to what #TheFallen has said your models should look like this
class Tag extends Model
{
/**
* Get all of the tags project
*/
public function projects()
{
return $this->belongsToMany('App\Project');
}
}
class Project extends Model
{
/**
* Get all of the project's tag
*/
public function tags()
{
return $this->belongsToMany('App\Tag');
}
}
Then you can do this
Project::whereHas('tags', function ($query) {
$query->where('name', 'like', '%sometag%');
})->get();