add resources assignment to tempus kalender entries

application/controllers/api/frontend/v1/tempus/Config.php

@@ -32,7 +32,7 @@ class Config extends FHCAPI_Controller
 	{
 		$config = [];
 
-		$result = $this->_ci->VariableModel->getVariables(getAuthUID(), ['ignore_kollision', 'kollision_student', 'ignore_reservierung', 'ignore_zeitsperre']);
+		$result = $this->_ci->VariableModel->getVariables(getAuthUID(), ['ignore_kollision', 'kollision_student', 'ignore_reservierung', 'ignore_zeitsperre', 'ignore_resources_collisions']);
 
 		$data = $this->getDataOrTerminateWithError($result);
 		$config['ignore_kollision'] = [
@@ -61,7 +61,11 @@ class Config extends FHCAPI_Controller
 			"value" => ($data['ignore_zeitsperre'] ?? 'false') === 'true'
 		];
 
-
+		$config['ignore_resources_collisions'] = [
+			"type"  => "checkbox",
+			"label" => $this->p->t('ui', 'ignore_resources_collisions'),
+			"value" => ($data['ignore_resources_collisions'] ?? 'false') === 'true'
+		];
 
 		$this->terminateWithSuccess($config);
 	}
@@ -108,6 +112,11 @@ class Config extends FHCAPI_Controller
 			'ignore_zeitsperre',
 			$this->input->post('ignore_zeitsperre') === true ? 'true' : 'false'
 		);
+		$this->_ci->VariableModel->setVariable(
+			getAuthUID(),
+			'ignore_resources_collisions',
+			$this->input->post('ignore_resources_collisions') === true ? 'true' : 'false'
+		);
 		$this->terminateWithSuccess();
 	}
 

application/controllers/api/frontend/v1/tempus/Kalender.php

@@ -224,7 +224,7 @@ class Kalender extends FHCAPI_Controller
 		if (isError($result))
 			$this->terminateWithError(getError($result),  $result->code);
 
-		$this->terminateWithSuccess();
+		$this->terminateWithSuccess(getData($result));
 	}
 
 	public function getRaumvorschlag()

application/controllers/api/frontend/v1/tempus/OperationalResourceToCalenderAPI.php

@@ -0,0 +1,84 @@
+<?php
+if (! defined('BASEPATH')) exit('No direct script access allowed');
+
+class OperationalResourceToCalenderAPI extends FHCAPI_Controller
+{
+	/**
+	 * Object initialization
+	 */
+	public function __construct()
+	{
+		parent::__construct([
+			'getAssignedResourcesByCalender' => ['admin:r', 'assistenz:r'],
+			'storeResourcesToCalendarRelationship' => ['admin:w', 'assistenz:w'],
+			'getSchedulableResourcesByCalendar' => ['admin:r', 'assistenz:r'],
+		]);
+
+		$this->load->model('ressource/BetriebsmittelKalender_model', 'BetriebsmittelKalenderModel');
+		$this->load->model('ressource/Betriebsmittel_model', 'BetriebsmittelModel');
+		$this->load->model('ressource/Kalender_model', 'KalenderModel');
+
+		$this->load->library('CollisionChecker');
+		$this->load->library('KalenderLib');
+	}
+
+	//------------------------------------------------------------------------------------------------------------------
+	// Public methods
+	public function getSchedulableResourcesByCalendar($calenderID)
+	{ 
+		if (!isset($calenderID)) $this->terminateWithError("Missing required parameter 'kalender_id'");
+
+		$result = $this->KalenderModel->loadWhere(['kalender_id' => $calenderID]);
+		if (isError($result)) $this->terminateWithError("Calendar with id '$calenderID' does not have a valid group id");
+ 
+		$calender = $this->getDataOrTerminateWithError($result)[0];
+		if (!isset($calender)) $this->terminateWithError("Calendar with id '$calenderID' not found");
+
+		$result = $this->BetriebsmittelModel->getSchedulableEntriesByDatetimeInterval($calender->von, $calender->bis);
+		$this->terminateWithSuccess($this->getDataOrTerminateWithError($result));
+	}
+
+	public function getAssignedResourcesByCalender($calenderID)
+	{
+		if (!isset($calenderID)) $this->terminateWithError("Missing required parameter 'kalender_id'");
+
+		$result = $this->KalenderModel->loadWhere(['kalender_id' => $calenderID]);
+		if (empty($result)) $this->terminateWithError("Calendar with id '$calenderID' not found");
+ 
+		$calenderGroupID = $this->getDataOrTerminateWithError($result)[0]->eindeutige_gruppen_id;
+		if (!isset($calenderGroupID)) $this->terminateWithError("Calendar with id '$calenderID' does not have a valid group id");
+
+
+		$this->BetriebsmittelKalenderModel->addSelect(['tbl_betriebsmittel_kalender.*', 'tbl_betriebsmittel.beschreibung', 'tbl_betriebsmittel.verplanen']);
+		$this->BetriebsmittelKalenderModel->addJoin('wawi.tbl_betriebsmittel', 'betriebsmittel_id');
+		$result = $this->BetriebsmittelKalenderModel->loadWhere([
+			'eindeutige_kalender_gruppen_id' => $calenderGroupID,
+			'tbl_betriebsmittel.verplanen' => true,
+		]);
+
+		$this->terminateWithSuccess($this->getDataOrTerminateWithError($result));
+	}
+
+	public function storeResourcesToCalendarRelationship()
+	{
+		$calenderID = $this->input->post('kalender_id');
+		$assignedResources = $this->input->post('assignedResources');
+
+		if (!isset($calenderID)) $this->terminateWithError("Missing required parameter 'kalender_id'", 'general');
+		if (!isset($assignedResources)) $this->terminateWithError("Missing required parameter 'assignedResources'", 'general');
+
+		$result = $this->KalenderModel->loadWhere(['kalender_id' => $calenderID]);
+		if (empty($result)) $this->terminateWithError("Calendar with id '$calenderID' not found");
+
+		$calendar = $this->getDataOrTerminateWithError($result)[0];
+		
+		$calenderGroupID = $calendar->eindeutige_gruppen_id;
+		if (!isset($calenderGroupID)) $this->terminateWithError("Calendar with id '$calenderID' does not have a valid group id");
+
+		$result = $this->kalenderlib->addOperationalResourcesToKalenderEvent($calendar, $assignedResources);
+		if (isError($result))
+			$this->terminateWithError(getError($result));
+
+		$this->terminateWithSuccess(['message' => 'Resources assigned successfully']);
+	}
+}

application/controllers/system/MigrateKalender.php

@@ -264,7 +264,108 @@ class MigrateKalender extends CLI_Controller
 		}
 	}
 
+	public function migrateStundenplanBetriebsmittelEntries() {
+		$this->setKalendarEntriesGroupIDs();
+		$this->setKalendarEntriesGroupIDsForChildren();
 
+		$dbModel = new DB_Model();
+
+		$deleteOldImportedTempusEntriesQuery = "DELETE from lehre.tbl_betriebsmittel_kalender WHERE quelle != 'tempus_neu' OR quelle IS NULL;";
+		$createHelperTypeQuery = "DO $$
+			BEGIN
+				IF NOT EXISTS (
+					SELECT 1
+					FROM pg_type
+					WHERE typname = 'betriebsmittel_info'
+				) THEN
+					CREATE TYPE betriebsmittel_info AS (
+						betriebsmittel_id bigint,
+						insertamum timestamp,
+						insertvon text
+					);
+				END IF;
+			END $$;";
+		
+		$query = $deleteOldImportedTempusEntriesQuery . 
+				 $createHelperTypeQuery .
+		"WITH test AS (
+			SELECT 
+				tk.eindeutige_gruppen_id AS eindeutige_gruppen_id,
+				array_agg(tk.kalender_id),
+				array_agg(
+					ROW(tsb.betriebsmittel_id, tsb.insertamum, tsb.insertvon)::betriebsmittel_info
+				) AS betriebsmittel_data
+			FROM sync.tbl_stundenplandev_kalender AS sk
+			JOIN lehre.tbl_kalender tk ON tk.kalender_id = sk.kalender_id
+			JOIN lehre.tbl_stundenplan_betriebsmittel tsb ON tsb.stundenplandev_id = sk.stundenplandev_id 
+			GROUP BY tk.eindeutige_gruppen_id 
+			)
+			INSERT INTO lehre.tbl_betriebsmittel_kalender (
+				eindeutige_kalender_gruppen_id, 
+				betriebsmittel_id,
+				insertamum,
+				insertvon
+				)
+			SELECT
+				t.eindeutige_gruppen_id,
+				bm.betriebsmittel_id,
+				bm.insertamum,
+				bm.insertvon
+			FROM test t
+			CROSS JOIN LATERAL unnest(t.betriebsmittel_data) AS bm
+			ON CONFLICT (eindeutige_kalender_gruppen_id, betriebsmittel_id) DO NOTHING;
+			;";
+
+		$dbModel->db->query($query);
+	}
+
+	private function setKalendarEntriesGroupIDs() {
+		$dbModel = new DB_Model();
+
+		$query = "UPDATE lehre.tbl_kalender
+			SET eindeutige_gruppen_id = gen_random_uuid()
+			WHERE vorgaenger_kalender_id IS NULL
+			AND eindeutige_gruppen_id IS NULL;";
+
+		$dbModel->db->query($query);
+
+	}
+
+	private function setKalendarEntriesGroupIDsForChildren() {
+		$dbModel = new DB_Model();
+
+		$query = "WITH RECURSIVE tree AS 
+			(
+				SELECT
+					kalender_id,
+					vorgaenger_kalender_id,
+					kalender_id AS root_id,
+					eindeutige_gruppen_id as root_eindeutige_gruppen_id
+				FROM lehre.tbl_kalender
+				WHERE vorgaenger_kalender_id IS NULL
+
+				UNION ALL
+
+				SELECT
+					i.kalender_id,
+					i.vorgaenger_kalender_id,
+					t.root_id,
+					t.root_eindeutige_gruppen_id 
+				FROM lehre.tbl_kalender i
+				JOIN tree t
+				ON i.vorgaenger_kalender_id = t.kalender_id
+				where i.eindeutige_gruppen_id is NULL
+			
+			)
+			UPDATE lehre.tbl_kalender k
+			SET eindeutige_gruppen_id = t.root_eindeutige_gruppen_id
+			FROM tree t
+			WHERE k.kalender_id = t.kalender_id
+			AND k.eindeutige_gruppen_id IS NULL;";
+
+		$dbModel->db->query($query);
+	}
+	
 	private function _insertKalender($block, $typ)
 	{
 		$result = $this->KalenderModel->insert(

application/helpers/hlp_common_helper.php

@@ -570,3 +570,13 @@ function buildDropdownEntryPrintArray($id, $name, $parameterurl, $uid=null, $ord
 		];
 
 }
+
+function generateUUID()
+{
+	$data = openssl_random_pseudo_bytes(16);
+
+	$data[6] = chr(ord($data[6]) & 0x0f | 0x40);
+	$data[8] = chr(ord($data[8]) & 0x3f | 0x80);
+
+	return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
+}

application/libraries/CollisionChecker.php

@@ -18,10 +18,12 @@ class CollisionChecker
 		$this->_ci->load->library('collision/checks/LectureCollisionCheck');
 		$this->_ci->load->library('collision/checks/VerbandCollisionCheck');
 		$this->_ci->load->library('collision/checks/StudentCollisionCheck');
+		$this->_ci->load->library('collision/checks/ResourcesCollisionCheck');
 		$this->register($this->_ci->roomcollisioncheck);
 		$this->register($this->_ci->lecturecollisioncheck);
 		$this->register($this->_ci->verbandcollisioncheck);
 		$this->register($this->_ci->studentcollisioncheck);
+		$this->register($this->_ci->resourcescollisioncheck);
 		Events::trigger('collision_register', $this);
 	}
 

application/libraries/KalenderLib.php

@@ -14,6 +14,7 @@ class KalenderLib
 		$this->_ci->load->model('ressource/Kalender_Event_model', 'KalenderEventModel');
 		$this->_ci->load->model('ressource/Kalender_Event_Teilnehmer_model', 'KalenderEventTeilnehmerModel');
 		$this->_ci->load->model('ressource/Kalender_Ort_model', 'KalenderOrtModel');
+		$this->_ci->load->model('ressource/BetriebsmittelKalender_model', 'BetriebsmittelKalenderModel');
 		$this->_ci->load->model('education/Lehreinheit_model', 'LehreinheitModel');
 		$this->_ci->load->model('education/Lehrveranstaltung_model', 'LehrveranstaltungModel');
 		$this->_ci->load->model('education/LehreinheitMitarbeiter_model', 'LehreinheitMitarbeiterModel');
@@ -38,6 +39,7 @@ class KalenderLib
 		$end_date = date('Y-m-d', strtotime($end_date . ' +1 day'));
 
 		$this->_ci->KalenderModel->addSelect('tbl_kalender.kalender_id,
+												tbl_kalender.eindeutige_gruppen_id,
 												tbl_kalender.status_kurzbz,
 												tbl_kalender.typ,
 												tbl_kalender.von,
@@ -134,6 +136,8 @@ class KalenderLib
 
 		$this->_ci->KalenderModel->db->where('tbl_kalender.von >=', $start_date);
 		$this->_ci->KalenderModel->db->where('tbl_kalender.bis <', $end_date);
+
+		$this->_ci->KalenderModel->addOrder('tbl_kalender.eindeutige_gruppen_id', 'DESC');
 	}
 
 	private function _mapEvents($data, $collisionCheck = true)
@@ -155,6 +159,7 @@ class KalenderLib
 				$bis = new DateTime($row->bis);
 
 				$events[$id] = (object) [
+					'eindeutige_gruppen_id' => $row->eindeutige_gruppen_id,
 					'type' => $row->typ,
 					'beginn' => $von->format('H:i:s'),
 					'ende' => $bis->format('H:i:s'),
@@ -179,7 +184,8 @@ class KalenderLib
 					'titel' => isset($row->titel) ? $row->titel : '',
 					'beschreibung' => isset($row->beschreibung) ? $row->beschreibung : '',
 					'topic' => [],
-					'collisions' => false
+					'collisions' => false,
+					'has_assigned_resources' => isset($row->has_assigned_resources) ? $row->has_assigned_resources : false,
 				];
 			}
 
@@ -436,6 +442,14 @@ class KalenderLib
 				WHERE nachfolger.vorgaenger_kalender_id = tbl_kalender.kalender_id)', null, false);
 
 		$this->_ci->KalenderModel->db->where_not_in('status_kurzbz', array('deleted'));
+
+		$this->_ci->KalenderModel->addSelect([ 
+			"(
+				SELECT COUNT(*) FROM lehre.tbl_betriebsmittel_kalender 
+				WHERE tbl_betriebsmittel_kalender.eindeutige_kalender_gruppen_id = tbl_kalender.eindeutige_gruppen_id
+			) AS has_assigned_resources"
+		]);
+		
 		$data = $this->_ci->KalenderModel->load();
 
 		return $this->_mapEvents($data);
@@ -633,6 +647,7 @@ class KalenderLib
 				'bis' => $end_date,
 				'typ' => 'lehreinheit',
 				'status_kurzbz' => 'planning',
+				'eindeutige_gruppen_id' => $this->_ci->KalenderModel->generateUniqueGroupId(),
 				'insertvon' => getAuthUID(),
 				'insertamum' => date('Y-m-d H:i:s')
 			)
@@ -990,6 +1005,81 @@ class KalenderLib
 		return $kalenderresult;
 	}
 
+	public function addOperationalResourcesToKalenderEvent($calendar, $assignedResources)
+	{
+		$checkerData = new stdClass();
+		$checkerData->kalender_id = $calendar->kalender_id;
+		$checkerData->betriebsmittel_ids = [];
+		$checkerData->von = $calendar->von;
+		$checkerData->bis = $calendar->bis;
+
+		foreach ($assignedResources as $assignedResource) {
+			array_push($checkerData->betriebsmittel_ids, $assignedResource['betriebsmittel_id']);
+		}
+
+		$errors = [];
+		$result = $this->_ci->collisionchecker->run($checkerData);
+		if (!empty($result))
+		{
+			$errors = $result;
+		}
+
+		if (!empty($errors)) {
+			return error($errors);
+		}
+		
+		$this->_ci->db->trans_start();
+
+		$allowedResourceIDs = array_filter(array_map(
+			function ($resource) {
+				return $resource['betriebsmittel_id'] ?? null;
+			},
+			$assignedResources
+		));
+
+		if (!empty($allowedResourceIDs)) {
+			$placeholders = implode(',', array_fill(0, count($allowedResourceIDs), '?'));
+
+			$query = "
+				DELETE FROM lehre.tbl_betriebsmittel_kalender
+				WHERE eindeutige_kalender_gruppen_id = ?
+				AND betriebsmittel_id NOT IN ($placeholders)
+			";
+
+			$params = array_merge(
+				[$calendar->eindeutige_gruppen_id],
+				$allowedResourceIDs
+			);
+
+			$this->_ci->db->query($query, $params);
+		} else {
+			$this->_ci->db->where('eindeutige_kalender_gruppen_id', $calendar->eindeutige_gruppen_id);
+			$this->_ci->db->delete('lehre.tbl_betriebsmittel_kalender');
+		}
+
+		foreach ($assignedResources as $assignedResource) {
+			$data = [
+				'eindeutige_kalender_gruppen_id' => $calendar->eindeutige_gruppen_id,
+				'betriebsmittel_id' => $assignedResource['betriebsmittel_id'],
+				'anmerkung' => $assignedResource['anmerkung'] ?? null,
+				'quelle' => 'tempus_neu',
+				'updateamum' => date('c'),
+				'updatevon' => getAuthUid(),
+			];
+			if (isset($assignedResource['betriebsmittel_kalender_id'])) {
+				$result = $this->_ci->BetriebsmittelKalenderModel->update($assignedResource['betriebsmittel_kalender_id'], $data);
+			} else {
+				$result = $this->_ci->BetriebsmittelKalenderModel->insert(array_merge($data, [
+					'insertvon' => getAuthUid(),
+					'updateamum' => date('c'),
+				]));
+			}
+		}
+		$this->_ci->db->trans_complete();
+
+		return success('Operational resources added to calendar event successfully.');
+	}
+
 	private function _addTeilnehmerToEvent($kalender_id, $uid, $rolle)
 	{
 		return $this->_ci->KalenderEventTeilnehmerModel->insert(
@@ -1090,6 +1180,18 @@ class KalenderLib
 
 		$kalender_entry = getData($entryResult);
 
+		$calendarResources = $this->_ci->BetriebsmittelKalenderModel->loadWhere(['eindeutige_kalender_gruppen_id' => $kalender_entry->eindeutige_gruppen_id]);
+		if (isError($calendarResources)) return $calendarResources;
+		
+		$calendarResourcesItems = getData($calendarResources);
+		$calendarResourcesIDs = [];
+ 		if (is_array($calendarResourcesItems)) {
+			$calendarResourcesIDs = array_map(function($resource) {
+				return $resource->betriebsmittel_id;
+			}, getData($calendarResources));
+		} 
+
+		$kalender_entry->betriebsmittel_ids = $calendarResourcesIDs;
 		$kalender_entry->ort_kurzbz = !is_null($ort_kurzbz) ? (array) $ort_kurzbz : $kalender_entry->ort_kurzbz;
 		$kalender_entry->von = $start_time ?? $kalender_entry->von;
 		$kalender_entry->bis = $end_time ?? $kalender_entry->bis;
@@ -1115,7 +1217,7 @@ class KalenderLib
 			if (isError($result)) return $result;
 		}
 
-		return success('Erfolgreich');
+		return success($result);
 	}
 
 	public function updateZeit($kalender_id, $start_date, $end_date)
@@ -1237,6 +1339,7 @@ class KalenderLib
 				'typ' => 'lehreinheit',
 				'status_kurzbz' => 'planning',
 				'vorgaenger_kalender_id' => $old_id,
+				'eindeutige_gruppen_id' => $kalender_entry->eindeutige_gruppen_id,
 				'insertvon' => getAuthUID(),
 				'insertamum' => date('Y-m-d H:i:s')
 			)

application/libraries/collision/checks/ResourcesCollisionCheck.php

@@ -0,0 +1,85 @@
+<?php
+
+class ResourcesCollisionCheck implements ICollisionCheck
+{
+
+	private $_ci;
+
+	public function __construct()
+	{
+		$this->_ci =& get_instance();
+		$this->_ci->load->model('ressource/Kalender_model', 'KalenderModel');
+		$this->_ci->load->library('VariableLib', array('uid' => getAuthUID()));
+		$this->_ci->load->library('PhrasesLib', array('ui'));
+	}
+
+	public function getName()
+	{
+		return 'resources';
+	}
+
+	public function check($data)
+	{
+		if (!isset($data->betriebsmittel_ids, $data->von, $data->bis, $data->kalender_id)) return [];
+
+		if (empty($data->betriebsmittel_ids)) return [];
+
+		if ($this->_ci->variablelib->getVar('ignore_kollision') === 'true') return [];
+		if ($this->_ci->variablelib->getVar('ignore_resources_collisions') === 'true') return [];
+
+		$this->_ci->KalenderModel->addSelect('kalender_id, von, bis, bm.beschreibung AS betriebsmittel_beschreibung');
+		$this->_ci->KalenderModel->addJoin('lehre.tbl_betriebsmittel_kalender bk', 'bk.eindeutige_kalender_gruppen_id = tbl_kalender.eindeutige_gruppen_id');
+		$this->_ci->KalenderModel->addJoin('wawi.tbl_betriebsmittel bm', 'bm.betriebsmittel_id = bk.betriebsmittel_id');
+
+		$this->_ci->KalenderModel->db->where('tbl_kalender.kalender_id !=', $data->kalender_id);
+		$this->_ci->KalenderModel->db->where('tbl_kalender.kalender_id NOT IN (SELECT vorgaenger_kalender_id FROM lehre.tbl_kalender WHERE vorgaenger_kalender_id IS NOT NULL)', null, false);
+		$this->_ci->KalenderModel->db->where_not_in('tbl_kalender.status_kurzbz', ['archived', 'deleted', 'to_delete']);
+		$this->_ci->KalenderModel->db->where_in('bk.betriebsmittel_id', $data->betriebsmittel_ids);
+
+
+		$result = $this->_ci->KalenderModel->loadWhere(array(
+			'von <' => $data->bis,
+			'bis >' => $data->von,
+		));
+
+		if (isError($result)) return [];
+		if (!hasData($result)) return [];
+
+		return array_map(function($row)
+		{
+			return [
+				'errorCode' => 'resource_collision',
+				'message' => $this->_ci->phraseslib->t('ui', 'resource_collision') . ': ' . $row->betriebsmittel_beschreibung . ' (' . date('d.m.Y H:i', strtotime($row->von)) . ' - ' . date('d.m.Y H:i', strtotime($row->bis)) . ')'
+			];
+		}, getData($result));
+	}
+
+	public function checkAll($kalender_ids) 
+	{
+		if (empty($kalender_ids)) return [];
+
+		$this->_ci->KalenderModel->addSelect('DISTINCT ON (tbl_kalender.kalender_id) tbl_kalender.kalender_id');
+		$this->_ci->KalenderModel->addJoin('lehre.tbl_betriebsmittel_kalender current_bk', 'current_bk.eindeutige_kalender_gruppen_id = tbl_kalender.eindeutige_gruppen_id');
+		$this->_ci->KalenderModel->addJoin('lehre.tbl_betriebsmittel_kalender other_bk', 'other_bk.betriebsmittel_id = current_bk.betriebsmittel_id');
+		$this->_ci->KalenderModel->addJoin('lehre.tbl_kalender other_kalender', 'other_kalender.eindeutige_gruppen_id = other_bk.eindeutige_kalender_gruppen_id');
+
+		$this->_ci->KalenderModel->db->where('other_kalender.kalender_id != tbl_kalender.kalender_id', null, false);
+		$this->_ci->KalenderModel->db->where('other_kalender.von < tbl_kalender.bis', null, false);
+		$this->_ci->KalenderModel->db->where('other_kalender.bis > tbl_kalender.von', null, false);
+		$this->_ci->KalenderModel->db->where_not_in('other_kalender.status_kurzbz', ['archived', 'deleted', 'to_delete']);
+		$this->_ci->KalenderModel->db->where_in('tbl_kalender.kalender_id', $kalender_ids);
+		$this->_ci->KalenderModel->db->where('other_kalender.kalender_id NOT IN (SELECT vorgaenger_kalender_id FROM lehre.tbl_kalender WHERE vorgaenger_kalender_id IS NOT NULL)', null, false);
+
+		$result = $this->_ci->KalenderModel->load();
+
+		if (isError($result) || !hasData($result)) return [];
+
+		$grouped = [];
+		foreach (getData($result) as $row)
+		{
+			$grouped[$row->kalender_id][] = true;
+		}
+
+		return $grouped;
+	}
+}

application/models/ressource/BetriebsmittelKalender_model.php

@@ -0,0 +1,14 @@
+<?php
+class BetriebsmittelKalender_model extends DB_Model
+{
+
+	/**
+	 * Constructor
+	 */
+	public function __construct()
+	{
+		parent::__construct();
+		$this->dbTable = 'lehre.tbl_betriebsmittel_kalender';
+		$this->pk = 'betriebsmittel_kalender_id';
+	}
+}

application/models/ressource/Betriebsmittel_model.php

@@ -31,4 +31,26 @@ class Betriebsmittel_model extends DB_Model
 
 		return $this->execQuery($qry);
 	}
+
+	public function getSchedulableEntriesByDatetimeInterval($from, $to)
+	{
+		$qry = "SELECT
+					*
+				FROM
+					wawi.tbl_betriebsmittel
+				WHERE
+					verplanen=true
+					AND 
+				NOT EXISTS(
+					SELECT 1 FROM lehre.tbl_betriebsmittel_kalender
+					JOIN lehre.tbl_kalender ON tbl_kalender.eindeutige_gruppen_id = tbl_betriebsmittel_kalender.eindeutige_kalender_gruppen_id
+					WHERE
+						betriebsmittel_id=tbl_betriebsmittel.betriebsmittel_id
+					AND tbl_kalender.von <= ?
+					AND tbl_kalender.bis >= ?
+				)";
+
+
+		return $this->execQuery($qry, array($from, $to));
+	}
 }

application/models/ressource/Kalender_model.php

@@ -11,4 +11,15 @@ class Kalender_model extends DB_Model
 		$this->dbTable = 'lehre.tbl_kalender';
 		$this->pk = 'kalender_id';
 	}
+
+	public function generateUniqueGroupId()
+	{
+		while (true) {
+			$uniqueGroupId = generateUUID();
+			$result = $this->loadWhere(['eindeutige_gruppen_id' => $uniqueGroupId]);
+			if (!hasData($result)) {
+				return $uniqueGroupId;
+			}
+		}
+	}
 }