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<?php
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declare(strict_types=1);
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namespace App\Support;
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use Illuminate\Support\Str;
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use Illuminate\Database\Eloquent\Builder;
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use Illuminate\Pagination\LengthAwarePaginator;
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class FilterRequest
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{
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public Builder $query;
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public array $searchableColumns;
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public array $filterableRelations = [];
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public array $scopes;
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public array $select = [];
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public function __construct(
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public string $modelClass
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) {
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$this->query = (new $modelClass)->query();
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}
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/**
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* Sets eager loads on the underlying query
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*
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* @param array $scopes
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* @return void
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*/
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public function setEagerRelations(string|array $relations)
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{
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$this->query = $this->query->with($relations);
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}
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/**
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* Sets scopes on the underlying query
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*
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* @param array $scopes
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* @return void
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*/
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public function setScopes(string|array $scopes): void
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{
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$this->query = $this->query->scopes($scopes);
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}
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/**
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* Allows nested json data to be aliased into a virtual column for the query
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*
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* @param array $columns can be an array of keys (e.g. `body.total_amount`)
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* @return void
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*/
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public function setVirtualColumns(array $columns)
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{
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foreach($columns as $column) {
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$column = Str::replace('.', '->', $column);
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$alias = Str::snake(Str::afterLast($column, '->'));
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array_push($this->select, $column . ' as ' . $alias);
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}
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}
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/**
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* Set columns that should be searched
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*
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* @param array $columns can be an array of keys (e.g. `user.name` or a nested array with
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* `relation`, `table`, and `column` attributes)
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* @return void
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*/
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public function setSearchableColumns(array $columns)
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{
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$this->searchableColumns = $columns;
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}
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/**
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* Set relations that can be filtered
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*
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* @param array $relations is an array of keys (relations) and values (columns)
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* @return void
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*/
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public function setFilterableRelations(array $relations)
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{
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$this->filterableRelations = $relations;
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}
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/**
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* Set related columns using aggregate function (e.g. `package.label` would become `package_label`)
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* which enables filtering, searching, and sorting on the front end
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*
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* @param array $columns can be an array of keys (e.g. `user.name` or a nested array with
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* `relation`, `table`, and `column` attributes)
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* @return void
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*/
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public function setRelationshipColumns(array $columns)
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{
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foreach($columns as $column) {
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// advanced
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if (is_array($column)) {
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$this->query->withAggregate($column['relation'], $column['table'].'.'.$column['column']);
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continue;
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}
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// not a relationship
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if(!Str::contains($column, '.')) {
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continue;
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}
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// normal rx
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$relationship = Str::before($column, '.');
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$key = Str::after($column, '.');
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$this->query->withAggregate($relationship, $key);
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}
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}
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/**
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* Get the resulting paginated collection
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*
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* @return LengthAwarePaginator
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*/
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public function get(): LengthAwarePaginator
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{
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// handle sort
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if (!empty(request()->query('sortBy'))) {
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if (Str::contains(request()->query('sortBy'), '.')) {
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$this->query->joinRelation(Str::before(request()->query('sortBy'), '.'));
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}
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$this->query->orderBy(
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request()->query('sortBy'),
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request()->query('sortDesc', false) == "true" ? 'DESC' : 'ASC'
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);
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}
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// handle filter
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if (request()->has('filter')) {
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foreach(request()->query('filter') as $filter => $params) {
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if (array_key_exists($filter, $this->filterableRelations)) {
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// filtered rx
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foreach(explode(',', $params) as $param) {
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$this->query->whereHas($filter, function ($query) use ($filter, $param) {
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$query->where($this->filterableRelations[$filter], $param);
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});
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}
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} else {
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// traditional filter
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foreach(explode(',', $params) as $param) {
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$this->query->having($filter, $param);
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}
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}
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}
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}
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// handle search
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if (request()->has('search') && !empty($this->searchableColumns)) {
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// make searchable relationships aggregate columns
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$this->setRelationshipColumns($this->searchableColumns);
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$this->query->where(function($query) {
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foreach($this->searchableColumns as $column) {
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// advanced
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if (is_array($column)) {
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$query->orWhereHas($column['relation'], function($query) use ($column) {
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$query->where($column['table'].'.'.$column['column'], "like", '%' . request()->query('search') . '%');
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});
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continue;
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}
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// normal RX
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if(Str::contains($column, '.')) {
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$query->orWhereHas(Str::before($column, '.'), function($query) use ($column) {
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$query->where(Str::after($column, '.'), "like", '%' . request()->query('search') . '%');
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});
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continue;
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}
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// not rx
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$query->orWhere($column, "like", '%' . request()->query('search') . '%');
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}
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});
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}
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// handle per page
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if (request()->query('itemsPerPage') == "-1") {
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$perPage = $this->query->count();
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} else {
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$perPage = request()->query('itemsPerPage', 15);
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}
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// run
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return $this->query->addSelect($this->select)->paginate($perPage);
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}
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}
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