[FAU-420] Add new "German language skills for international students" filter and allow sorting by it

src/Application/Filter/FilterFactory.php

@@ -7,16 +7,17 @@
 final class FilterFactory
 {
     public const SUPPORTED_FILTERS = [
+        AdmissionRequirementTypeFilter::KEY => AdmissionRequirementTypeFilter::class,
         AreaOfStudyFilter::KEY => AreaOfStudyFilter::class,
         AttributeFilter::KEY => AttributeFilter::class,
         DegreeFilter::KEY => DegreeFilter::class,
         FacultyFilter::KEY => FacultyFilter::class,
+        GermanLanguageSkillsForInternationalStudentsFilter::KEY => GermanLanguageSkillsForInternationalStudentsFilter::class,
         SearchKeywordFilter::KEY => SearchKeywordFilter::class,
         SemesterFilter::KEY => SemesterFilter::class,
         StudyLocationFilter::KEY => StudyLocationFilter::class,
         SubjectGroupFilter::KEY => SubjectGroupFilter::class,
         TeachingLanguageFilter::KEY => TeachingLanguageFilter::class,
-        AdmissionRequirementTypeFilter::KEY => AdmissionRequirementTypeFilter::class,
     ];
 
     public function create(string $filterName, mixed $value): ?Filter

src/Application/Filter/GermanLanguageSkillsForInternationalStudentsFilter.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Fau\DegreeProgram\Common\Application\Filter;
+
+final class GermanLanguageSkillsForInternationalStudentsFilter implements Filter
+{
+    use ArrayOfIdsFilterTrait;
+
+    public const KEY = 'german-language-skills-for-international-students';
+
+    public function id(): string
+    {
+        return self::KEY;
+    }
+}

src/Application/Repository/CollectionCriteria.php

@@ -28,6 +28,7 @@ final class CollectionCriteria
         DegreeProgram::START,
         DegreeProgram::LOCATION,
         DegreeProgram::ADMISSION_REQUIREMENTS,
+        DegreeProgram::GERMAN_LANGUAGE_SKILLS_FOR_INTERNATIONAL_STUDENTS,
     ];
 
     /**

src/Infrastructure/Content/Taxonomy/GermanLanguageSkillsForInternationalStudentsTaxonomy.php

@@ -4,13 +4,15 @@
 
 namespace Fau\DegreeProgram\Common\Infrastructure\Content\Taxonomy;
 
+use Fau\DegreeProgram\Common\Application\Filter\GermanLanguageSkillsForInternationalStudentsFilter;
+
 /**
  * Deutschkenntnisse für ausländische Studierende
  */
 final class GermanLanguageSkillsForInternationalStudentsTaxonomy extends Taxonomy
 {
     public const KEY = 'german_for_int_students';
-    public const REST_BASE = 'german-language-skills-for-international-students';
+    public const REST_BASE = GermanLanguageSkillsForInternationalStudentsFilter::KEY;
 
     public function key(): string
     {

src/Infrastructure/Repository/WpQueryArgsBuilder.php

@@ -10,6 +10,7 @@
 use Fau\DegreeProgram\Common\Application\Filter\DegreeFilter;
 use Fau\DegreeProgram\Common\Application\Filter\FacultyFilter;
 use Fau\DegreeProgram\Common\Application\Filter\Filter;
+use Fau\DegreeProgram\Common\Application\Filter\GermanLanguageSkillsForInternationalStudentsFilter;
 use Fau\DegreeProgram\Common\Application\Filter\SearchKeywordFilter;
 use Fau\DegreeProgram\Common\Application\Filter\SemesterFilter;
 use Fau\DegreeProgram\Common\Application\Filter\StudyLocationFilter;
@@ -40,6 +41,7 @@ final class WpQueryArgsBuilder
         StudyLocationFilter::class,
         SubjectGroupFilter::class,
         TeachingLanguageFilter::class,
+        GermanLanguageSkillsForInternationalStudentsFilter::class,
     ];
 
     private const ALIASES = [