How to count and sum inner relational model in laravel - laravel

Question

I am building a small application in Laravel where I got stuck with the sum of inner relational data,
I have a model Company which has Many relation associatedProjects and associatedProjects belongs to relation project and project hasOne technicalDescription.
Company Model:
class Company extends Model {
public function roles()
{
return $this->belongsToMany('Noetic\Plugins\Conxn\Models\Variables\Company\Role', 'company_role_relation', 'company_id', 'role_id')->withTimestamps();
}
public function specialisations()
{
return $this->belongsToMany('Noetic\Plugins\Conxn\Models\Variables\Company\Role', 'company_specialisation_relation', 'company_id', 'specialisation_id')->withTimestamps();
}
public function associatedProjects()
{
return $this->hasMany('Noetic\Plugins\Conxn\Models\Project\AssociateCompany','company_id','id');
}
}
AssociateCompany Model:
class AssociateCompany extends Model {
protected $table = 'project_associate_company';
protected $fillable = [
'project_id', 'company_role_id', 'company_specialisation_id', 'company_id', 'link', 'file_name'
];
public function project()
{
return $this->belongsTo('Noetic\Plugins\Conxn\Models\Project','project_id','id');
}
public function company()
{
return $this->belongsTo('Noetic\Plugins\Conxn\Models\Company','company_id','id');
}
public function companyRole()
{
return $this->belongsTo('Noetic\Plugins\Conxn\Models\Variables\Company\Role',
'company_role_id','id');
}
public function specialisation()
{
return $this->belongsTo('Noetic\Plugins\Conxn\Models\Variables\Company\Role',
'company_specialisation_id','id');
}
}
Project Model
class Project extends Model {
protected $fillable = [
'user_id','koshy_id', 'name', 'slug', 'owner_spv', 'spv_link', 'latitude', 'longitude',
'landmark', 'city', 'district', 'state', 'pin_code', 'region_id', 'country', 'building_use',
'sector', 'conxn_id', 'parent_project_id', 'website', 'project_logo', 'tracked', 'verified',
'code_link', 'status', 'active', 'premium','area'
];
public function technicalDescription()
{
return $this->hasOne('Noetic\Plugins\Conxn\Models\Project\TechnicalDescription','project_id','id');
}
public function associateCompany()
{
return $this->hasMany('Noetic\Plugins\Conxn\Models\Project\AssociateCompany','project_id','id');
}
}
Now this technicalDescription has fields construction_cost, now I want to first count total number of associatedProject and fetch sum of all the project's construction_cost which is in technicalDescription, some what I have done this code:
$company = Company:: where( 'status', 'saved')
->withCount( 'associatedProjects' )
->with('associatedProjects.project.technicalDescription')
->get()
->transform(function ($value) {
$value['project_value'] = $value['associatedProjects']->flatten(2)
->pluck('project.technicalDescription')->sum('construction_cost');
return $value;
})
->sortByDesc('project_value')
->forpage( $request->page , 10 );
$next = $request->page+1 ;
$previous =$request->page-1 ? abs($request->page-1):1 ;
I am unable to use paginate over here as laravel collection doesn't have such method, moreover the query logic also doesn't appear accurate.
Any suggestions are welcome. Thanks

Answer 1

You can use a BelongsToMany relationship to get the technicalDescriptions directly:
class Company extends Model {
public function technicalDescriptions() {
return $this->belongsToMany(
'Noetic\Plugins\Conxn\Models\Project\TechnicalDescription',
'project_associate_company',
'company_id',
'project_id',
null,
'project_id'
);
}
}
$company = Company::where('status', 'saved')
->withCount(['technicalDescriptions as project_value' => function($query) {
$query->select(DB::raw('sum(construction_cost)'));
}])
->orderByDesc('project_value')
->paginate();