Wiring up new Organisation entity type

src/Plugin/Derivative/AddOrganisationssMenuLink.php

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+<?php
+
+namespace Drupal\opencase\Plugin\Derivative;
+
+use Drupal\Component\Plugin\Derivative\DeriverBase;
+use Drupal\Core\Plugin\Discovery\ContainerDeriverInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Derivative class that provides the menu links adding various types of organisations
+ */
+class AddOrganisationsMenuLink extends DeriverBase implements ContainerDeriverInterface {
+
+  /**
+   * @var EntityTypeManagerInterface $entityTypeManager.
+   */
+
+  protected $entityTypeManager;
+  
+  /**
+   * Creates a AddOrganisationsMenuLink instance.
+   *
+   * @param $base_plugin_id
+   * @param EntityTypeManagerInterface $entity_type_manager
+   */
+  public function __construct($base_plugin_id, EntityTypeManagerInterface $entity_type_manager) {
+    $this->entityTypeManager = $entity_type_manager;
+  }
+
+ /**
+   * {@inheritdoc}
+   */
+ public static function create(ContainerInterface $container, $base_plugin_id) {
+   return new static(
+    $base_plugin_id,
+    $container->get('entity_type.manager')
+   );
+ }
+  /**
+   * {@inheritdoc}
+   */
+  public function getDerivativeDefinitions($base_plugin_definition) {
+    $links = [];
+    $organisationTypes = $this->entityTypeManager->getStorage('oc_organisation_type')->loadMultiple();
+    foreach ($organisationTypes as $id => $organisationType) {
+      $links[$id] = [
+        'title' => "Add ". $organisationType->label(),
+        'route_name' => "entity.oc_organisation.add_form",
+        'route_parameters' => ['oc_organisation_type' => $organisationType->id()]
+      ] + $base_plugin_definition;
+    }
+    return $links;
+  }
+}

src/Plugin/Derivative/SeeAllOrganisationsMenuLink.php

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+<?php
+
+namespace Drupal\opencase\Plugin\Derivative;
+
+use Drupal\Component\Plugin\Derivative\DeriverBase;
+use Drupal\Core\Plugin\Discovery\ContainerDeriverInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Derivative class that provides the menu links adding various types of organisations
+ */
+class SeeAllOrganisationsMenuLink extends DeriverBase implements ContainerDeriverInterface {
+
+  /**
+   * @var EntityTypeManagerInterface $entityTypeManager.
+   */
+
+  protected $entityTypeManager;
+  
+  /**
+   * Creates a SeeAllOrganisationsMenuLink instance.
+   *
+   * @param $base_plugin_id
+   * @param EntityTypeManagerInterface $entity_type_manager
+   */
+  public function __construct($base_plugin_id, EntityTypeManagerInterface $entity_type_manager) {
+    $this->entityTypeManager = $entity_type_manager;
+  }
+
+ /**
+   * {@inheritdoc}
+   */
+ public static function create(ContainerInterface $container, $base_plugin_id) {
+   return new static(
+    $base_plugin_id,
+    $container->get('entity_type.manager')
+   );
+ }
+  /**
+   * {@inheritdoc}
+   */
+  public function getDerivativeDefinitions($base_plugin_definition) {
+    $links = [];
+    $organisationTypes = $this->entityTypeManager->getStorage('oc_organisation_type')->loadMultiple();
+    foreach ($organisationTypes as $id => $organisationType) {
+      $links[$id] = [
+        'title' => $organisationType->label().'s',
+        'route_name' => "view.all_organisations_of_a_type.page_1",
+        'route_parameters' => ['organisation_type' => $organisationType->id()]
+      ] + $base_plugin_definition;
+    }
+    return $links;
+  }
+}

src/Plugin/Menu/AddOrganisationssMenuLink.php

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+<?php
+namespace Drupal\opencase\Plugin\Menu;
+ 
+use Drupal\Core\Menu\MenuLinkDefault;
+ 
+class AddOrganisationsMenuLink extends MenuLinkDefault {}

src/Plugin/Menu/SeeAllOrganisationsMenuLink.php

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+<?php
+namespace Drupal\opencase\Plugin\Menu;
+ 
+use Drupal\Core\Menu\MenuLinkDefault;
+ 
+class SeeAllOrganisationgMenuLink extends MenuLinkDefault {}