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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace SilverStripe\ORM\Tests\Search;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\Assets\File;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\ORM\Connect\MySQLSchemaManager;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\Core\Config\Config;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\Dev\SapphireTest;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\ORM\DataObject;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\ORM\Search\FulltextSearchable;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class FulltextSearchableTest extends SapphireTest  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function setUp()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        parent::setUp();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        FulltextSearchable::enable(File::class);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * FulltextSearchable::enable() leaves behind remains that don't get cleaned up  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * properly at the end of the test. This becomes apparent when a later test tries to  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * ALTER TABLE File and add fulltext indexes with the InnoDB table type.  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected function tearDown()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        parent::tearDown();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        File::remove_extension(FulltextSearchable::class);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        Config::inst()->update(  | 
            
                            
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                            File::class,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            'create_table_options',  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            array(  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            MySQLSchemaManager::ID => 'ENGINE=InnoDB')  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function testEnable()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->assertTrue(File::has_extension(FulltextSearchable::class));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function testEnableWithCustomClasses()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        FulltextSearchable::enable(array(File::class));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->assertTrue(File::has_extension(FulltextSearchable::class));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        File::remove_extension(FulltextSearchable::class);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->assertFalse(File::has_extension(FulltextSearchable::class));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function testIndexesAdded()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $indexes = DataObject::getSchema()->databaseIndexes(File::class);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->assertArrayHasKey('SearchFields', $indexes); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->assertCount(2, $indexes['SearchFields']['columns']);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->assertContains('Name', $indexes['SearchFields']['columns']); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->assertContains('Title', $indexes['SearchFields']['columns']); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: