[4.2] Move Show operation setup in its own method

src/app/Http/Controllers/Operations/ShowOperation.php

@@ -32,6 +32,10 @@ protected function setupShowDefaults()
 
         $this->crud->operation('show', function () {
             $this->crud->loadDefaultOperationSettingsFromConfig();
+
+            if (! method_exists($this, 'setupShowOperation')) {
+                $this->autoSetupShowOperation();
+            }
         });
 
         $this->crud->operation('list', function () {
@@ -70,18 +74,49 @@ public function show($id)
 
         // get entry ID from Request (makes sure its the last ID for nested resources)
         $id = $this->crud->getCurrentEntryId() ?? $id;
-        $setFromDb = $this->crud->get('show.setFromDb');
 
-        // get the info for that entry
-        $this->data['entry'] = $this->crud->getEntry($id);
+        // get the info for that entry (include softDeleted items if the trait is used)
+        if ($this->crud->get('show.softDeletes') && in_array('Illuminate\Database\Eloquent\SoftDeletes', class_uses($this->crud->model))) {
+            $this->data['entry'] = $this->crud->getModel()->withTrashed()->findOrFail($id);
+        } else {
+            $this->data['entry'] = $this->crud->getEntry($id);
+        }
+
         $this->data['crud'] = $this->crud;
         $this->data['title'] = $this->crud->getTitle() ?? trans('backpack::crud.preview').' '.$this->crud->entity_name;
 
-        // set columns from db
-        if ($setFromDb) {
+        // load the view from /resources/views/vendor/backpack/crud/ if it exists, otherwise load the one in the package
+        return view($this->crud->getShowView(), $this->data);
+    }
+
+    /**
+     * Default behaviour for the Show Operation, in case none has been
+     * provided by including a setupShowOperation() method in the CrudController.
+     */
+    protected function autoSetupShowOperation()
+    {
+        // guess which columns to show, from the database table
+        if ($this->crud->get('show.setFromDb')) {
             $this->crud->setFromDb(false, true);
         }
 
+        // if the model has timestamps, add columns for created_at and updated_at
+        if ($this->crud->get('show.timestamps') && $this->crud->model->usesTimestamps()) {
+            $this->crud->column($this->crud->model->getCreatedAtColumn())->type('datetime');
+            $this->crud->column($this->crud->model->getUpdatedAtColumn())->type('datetime');
+        }
+
+        // if the model has SoftDeletes, add column for deleted_at
+        if ($this->crud->get('show.softDeletes') && in_array('Illuminate\Database\Eloquent\SoftDeletes', class_uses($this->crud->model))) {
+            $this->crud->column($this->crud->model->getDeletedAtColumn())->type('datetime');
+        }
+
+        // remove the columns that usually don't make sense inside the Show operation
+        $this->removeColumnsThatDontBelongInsideShowOperation();
+    }
+
+    protected function removeColumnsThatDontBelongInsideShowOperation()
+    {
         // cycle through columns
         foreach ($this->crud->columns() as $key => $column) {
 
@@ -113,13 +148,7 @@ public function show($id)
             }
         }
 
-        // remove preview button from stack:line
-        $this->crud->removeButton('show');
-
         // remove bulk actions colums
         $this->crud->removeColumns(['blank_first_column', 'bulk_actions']);
-
-        // load the view from /resources/views/vendor/backpack/crud/ if it exists, otherwise load the one in the package
-        return view($this->crud->getShowView(), $this->data);
     }
 }

src/config/backpack/operations/show.php

@@ -10,4 +10,15 @@
     // Define the size/looks of the content div for all CRUDs
     // To override per Controller use $this->crud->setShowContentClass('class-string')
     'contentClass' => 'col-md-8',
+
+    // Automatically add all columns from the db table?
+    'setFromDb'  => true,
+
+    // Automatically add created_at and updated_at columns, if model has timestamps?
+    'timestamps' => true,
+
+    // If model has SoftDeletes, allow the admin to access the Show page for
+    // soft deleted items & add a deleted_at column to ShowOperation?
+    'softDeletes' => true,
+
 ];