rename task to project_task and task_user to project_task_user; create project_task_category, fix bug in create project method

backend/modules/task/views/project-task-category/index.php

@@ -0,0 +1,51 @@
+<?php
+
+use backend\modules\project\models\Project;
+use kartik\select2\Select2;
+use yii\helpers\Html;
+use yii\grid\GridView;
+
+/* @var $this yii\web\View */
+/* @var $searchModel backend\modules\task\models\ProjectTaskCategorySearch */
+/* @var $dataProvider yii\data\ActiveDataProvider */
+
+$this->title = 'Категории задач проекта';
+$this->params['breadcrumbs'][] = $this->title;
+?>
+<div class="project-task-category-index">
+
+    <?php // echo $this->render('_search', ['model' => $searchModel]); ?>
+
+    <p>
+        <?= Html::a('Создать категорию задач', ['create'], ['class' => 'btn btn-success']) ?>
+    </p>
+
+    <?= GridView::widget([
+        'dataProvider' => $dataProvider,
+        'filterModel' => $searchModel,
+        'columns' => [
+            ['class' => 'yii\grid\SerialColumn'],
+
+            'title',
+            [
+                'attribute' => 'project_id',
+                'value' => 'project.name',
+                'filter' =>  Select2::widget([
+                    'model' => $searchModel,
+                    'attribute' => 'project_id',
+                    'data' => Project::find()->select(['project.name', 'project.id'])
+                        ->indexBy('project.id')->column(),
+                    'pluginOptions' => [
+                        'allowClear' => true,
+                    ],
+                    'options' => [
+                        'class' => 'form-control',
+                        'placeholder' => 'Выберите значение'
+                    ],
+                ])
+            ],
+
+            ['class' => 'yii\grid\ActionColumn'],
+        ],
+    ]); ?>
+</div>