FIX Prevent duplicate tags and categories.

code/compat/pages/BlogEntry.php

@@ -37,7 +37,7 @@ class BlogEntry extends BlogPost implements MigratableObject
      */
     public function up()
     {
-        
+
         //Migrate comma separated tags into BlogTag objects.
         foreach ($this->TagNames() as $tag) {
             $existingTag = BlogTag::get()->filter(array('Title' => $tag, 'BlogID' => $this->ParentID));
@@ -45,7 +45,6 @@ class BlogEntry extends BlogPost implements MigratableObject
                 //if tag already exists we will simply add it to this post.
                 $tagObject = $existingTag->First();
             } else {
-
                 //if the tag is now we create it and add it to this post.
                 $tagObject = new BlogTag();
                 $tagObject->Title = $tag;
@@ -69,7 +68,7 @@ class BlogEntry extends BlogPost implements MigratableObject
         $this->PublishDate = $this->Date;
         $this->AuthorNames = $this->Author;
         $this->InheritSideBar = true;
-        
+
         //Write and additionally publish the item if it was published before.
         $this->write();
         if ($published) {
@@ -78,7 +77,7 @@ class BlogEntry extends BlogPost implements MigratableObject
         } else {
             $message = "DRAFT: ";
         }
-        
+
         return $message . $this->Title;
     }
 

code/model/BlogCategory.php

@@ -13,6 +13,16 @@
  */
 class BlogCategory extends DataObject implements CategorisationObject
 {
+
+    /**
+     * Use an exception code so that attempted writes can continue on
+     * duplicate errors.
+     *
+     * @const string
+     * This must be a string because ValidationException has decided we can't use int
+     */
+    const DUPLICATE_EXCEPTION = "DUPLICATE";
+
     /**
      * @var array
      */
@@ -40,16 +50,16 @@ class BlogCategory extends DataObject implements CategorisationObject
     private static $extensions = array(
         'URLSegmentExtension',
     );
-    
+
     /**
      * @return DataList
      */
     public function BlogPosts()
     {
         $blogPosts = parent::BlogPosts();
-    
+
         $this->extend("updateGetBlogPosts", $blogPosts);
-    
+
         return $blogPosts;
     }
 
@@ -67,6 +77,31 @@ class BlogCategory extends DataObject implements CategorisationObject
         return $fields;
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    protected function validate()
+    {
+        $validation = parent::validate();
+        if($validation->valid()) {
+            // Check for duplicate categories
+            $blog = $this->Blog();
+            if($blog && $blog->exists()) {
+                $existing = $blog->Categories()->filter('Title', $this->Title);
+                if($this->ID) {
+                    $existing = $existing->exclude('ID', $this->ID);
+                }
+                if($existing->count() > 0) {
+                    $validation->error(_t(
+                        'BlogCategory.Duplicate',
+                        'A blog category already exists with that name'
+                    ), BlogCategory::DUPLICATE_EXCEPTION);
+                }
+            }
+        }
+        return $validation;
+    }
+
     /**
      * Returns a relative link to this category.
      *

code/model/BlogTag.php

@@ -14,6 +14,16 @@
  */
 class BlogTag extends DataObject implements CategorisationObject
 {
+
+    /**
+     * Use an exception code so that attempted writes can continue on
+     * duplicate errors.
+     *
+     * @const string
+     * This must be a string because ValidationException has decided we can't use int
+     */
+    const DUPLICATE_EXCEPTION = "DUPLICATE";
+
     /**
      * @var array
      */
@@ -68,6 +78,31 @@ class BlogTag extends DataObject implements CategorisationObject
         return $fields;
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    protected function validate()
+    {
+        $validation = parent::validate();
+        if($validation->valid()) {
+            // Check for duplicate tags
+            $blog = $this->Blog();
+            if($blog && $blog->exists()) {
+                $existing = $blog->Tags()->filter('Title', $this->Title);
+                if($this->ID) {
+                    $existing = $existing->exclude('ID', $this->ID);
+                }
+                if($existing->count() > 0) {
+                    $validation->error(_t(
+                        'BlogTag.Duplicate',
+                        'A blog tags already exists with that name'
+                    ), BlogTag::DUPLICATE_EXCEPTION);
+                }
+            }
+        }
+        return $validation;
+    }
+
     /**
      * Returns a relative URL for the tag link.
      *

tests/BlogCategoryTest.php

@@ -123,4 +123,27 @@ class BlogCategoryTest extends FunctionalTest
         $this->assertTrue($category->canDelete($admin), 'Admin should always be able to delete category.');
         $this->assertTrue($category->canDelete($editor), 'Editor should be able to delete category.');
     }
+
+    public function testDuplicateCategories() {
+        $blog = new Blog();
+        $blog->Title = 'Testing for duplicate categories';
+        $blog->write();
+
+        $category = new BlogCategory();
+        $category->Title = 'Test';
+        $category->BlogID = $blog->ID;
+        $category->write();
+
+        $category = new BlogCategory();
+        $category->Title = 'Test';
+        $category->BlogID = $blog->ID;
+        try {
+            $category->write();
+            $this->fail('Duplicate BlogCategory written');
+        } catch (ValidationException $e) {
+            $codeList = $e->getResult()->codeList();
+            $this->assertCount(1, $codeList);
+            $this->assertEquals(BlogTag::DUPLICATE_EXCEPTION, $codeList[0]);
+        }
+    }
 }

tests/BlogTagTest.php

@@ -137,16 +137,40 @@ class BlogTagTest extends FunctionalTest
         $blog->Title = 'Testing for duplicates blog';
         $blog->write();
         $tag1 = new BlogTag();
-        $tag1->Title = 'Cat';
+        $tag1->Title = 'cat-test';
         $tag1->BlogID = $blog->ID;
         $tag1->write();
-        $this->assertEquals('cat', $tag1->URLSegment);
+        $this->assertEquals('cat-test', $tag1->URLSegment);
 
         $tag2 = new BlogTag();
-        $tag2->Title = 'Cat';
+        $tag2->Title = 'cat test';
         $tag2->BlogID = $blog->ID;
         $tag2->write();
-        $this->assertEquals('cat-0', $tag2->URLSegment);
+        $this->assertEquals('cat-test-0', $tag2->URLSegment);
 
     }
+
+    public function testDuplicateTags() {
+        $blog = new Blog();
+        $blog->Title = 'Testing for duplicate tags';
+        $blog->write();
+
+        $tag = new BlogTag();
+        $tag->Title = 'Test';
+        $tag->BlogID = $blog->ID;
+        $tag->write();
+
+        $tag = new BlogTag();
+        $tag->Title = 'Test';
+        $tag->BlogID = $blog->ID;
+        try {
+            $tag->write();
+            $this->fail('Duplicate BlogTag written');
+        } catch (ValidationException $e) {
+            $codeList = $e->getResult()->codeList();
+            $this->assertCount(1, $codeList);
+            $this->assertEquals(BlogTag::DUPLICATE_EXCEPTION, $codeList[0]);
+        }
+    }
+
 }