Refactor Query of DocumentFactory

app/Letter/DocumentFactory.php

@@ -2,6 +2,8 @@
 
 namespace App\Letter;
 
+use App\Letter\Queries\BillKindQuery;
+use App\Letter\Queries\SingleMemberQuery;
 use App\Member\Member;
 use Illuminate\Database\Eloquent\Collection as EloquentCollection;
 use Illuminate\Support\Collection;
@@ -94,15 +96,7 @@ class DocumentFactory
      */
     private function singleMemberPages(Member $member, string $type): Collection
     {
-        $members = Member::where($member->only(['lastname', 'address', 'zip', 'location']))
-            ->with([
-                'payments' => fn ($query) => $type::paymentsQuery($query)
-                    ->orderByRaw('nr, member_id'),
-            ])
-            ->get()
-            ->filter(fn (Member $member) => $member->payments->count() > 0);
-
-        return $this->toPages($members);
+        return (new SingleMemberQuery($member))->getPages($type);
     }
 
     /**
@@ -112,15 +106,7 @@ class DocumentFactory
      */
     private function allMemberPages(string $type, BillKind $billKind): Collection
     {
-        $members = Member::where('bill_kind', $billKind)
-            ->with([
-                'payments' => fn ($query) => $type::paymentsQuery($query)
-                    ->orderByRaw('nr, member_id'),
-            ])
-            ->get()
-            ->filter(fn (Member $member) => $member->payments->count() > 0);
-
-        return $this->toPages($members);
+        return (new BillKindQuery($billKind))->getPages($type);
     }
 
     /**

app/Letter/Queries/BillKindQuery.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace App\Letter\Queries;
+
+use App\Letter\BillKind;
+use App\Member\Member;
+use Illuminate\Database\Eloquent\Builder;
+
+class BillKindQuery extends LetterMemberQuery
+{
+    public function __construct(
+        private BillKind $billKind
+    ) {
+    }
+
+    /**
+     * @return Builder<Member>
+     */
+    protected function getQuery(): Builder
+    {
+        return Member::where('bill_kind', $this->billKind);
+    }
+}

app/Letter/Queries/LetterMemberQuery.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace App\Letter\Queries;
+
+use App\Letter\Letter;
+use App\Letter\Page;
+use App\Member\Member;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Collection as EloquentCollection;
+use Illuminate\Support\Collection;
+use Illuminate\Support\Str;
+
+abstract class LetterMemberQuery
+{
+    /**
+     * @return Builder<Member>
+     */
+    abstract protected function getQuery(): Builder;
+
+    /**
+     * @param class-string<Letter> $type
+     *
+     * @return Collection<int, Page>
+     */
+    public function getPages(string $type): Collection
+    {
+        return $this->get($type)->groupBy(
+            fn ($member) => Str::slug(
+                "{$member->lastname}{$member->address}{$member->zip}{$member->location}",
+            ),
+        )->map(fn ($page) => new Page($page));
+    }
+
+    /**
+     * @param class-string<Letter> $type
+     *
+     * @return EloquentCollection<Member>
+     */
+    private function get(string $type): EloquentCollection
+    {
+        return $this->getQuery()
+            ->with([
+                'payments' => fn ($query) => $type::paymentsQuery($query)
+                    ->orderByRaw('nr, member_id'),
+            ])
+            ->get()
+            ->filter(fn (Member $member) => $member->payments->count() > 0);
+    }
+}

app/Letter/Queries/SingleMemberQuery.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Letter\Queries;
+
+use App\Member\Member;
+use Illuminate\Database\Eloquent\Builder;
+
+class SingleMemberQuery extends LetterMemberQuery
+{
+    public function __construct(
+        private Member $member
+    ) {
+    }
+
+    /**
+     * @return Builder<Member>
+     */
+    protected function getQuery(): Builder
+    {
+        return Member::where($this->member->only(['lastname', 'address', 'zip', 'location']));
+    }
+}