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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Firesphere\PartialUserforms\Extensions;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Firesphere\PartialUserforms\Models\PartialFormSubmission;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\Forms\CheckboxField;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\Forms\FieldList;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\Forms\GridField\GridField;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\Forms\GridField\GridFieldAddNewButton;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\Forms\GridField\GridFieldConfig_RecordEditor;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\Forms\Tab;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\ORM\DataExtension;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\ORM\DataList;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\UserForms\Model\UserDefinedForm;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Class UserDefinedFormExtension  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package Firesphere\PartialUserforms\Extensions  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @property UserDefinedForm|UserDefinedFormExtension $owner  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @property boolean $ExportPartialSubmissions  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @property boolean $PasswordProtected  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method DataList|PartialFormSubmission[] PartialSubmissions()  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                 */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                class UserDefinedFormExtension extends DataExtension  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @var array  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    private static $db = [  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        'ExportPartialSubmissions' => 'Boolean(true)',  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        'PasswordProtected'        => 'Boolean(false)'  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    ];  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @var array  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    private static $has_many = [  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        'PartialSubmissions' => PartialFormSubmission::class  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    ];  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param FieldList $fields  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function updateCMSFields(FieldList $fields)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /** @var GridField $submissionField */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $submissionField = $fields->dataFieldByName('Submissions'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $list = $submissionField->getList()->exclude(['ClassName' => PartialFormSubmission::class]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $submissionField->setList($list);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $fields->removeByName('PartialSubmissions'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /** @var GridFieldConfig_RecordEditor $gridfieldConfig */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $gridfieldConfig = GridFieldConfig_RecordEditor::create();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $gridfieldConfig->removeComponentsByType(GridFieldAddNewButton::class);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // We need to manually add the tab  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $fields->addFieldToTab(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'Root',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            Tab::create('PartialSubmissions', _t(__CLASS__ . '.PartialSubmission', 'Partial submissions')) | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $fields->addFieldToTab(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'Root.PartialSubmissions',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            GridField::create(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'PartialSubmissions',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                _t(__CLASS__ . '.PartialSubmission', 'Partial submissions'),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->owner->PartialSubmissions(),  | 
            
                            
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                                $gridfieldConfig  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            )  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $fields->insertBefore(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'DisableSaveSubmissions',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $pwdCheckbox = CheckboxField::create(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'PasswordProtected',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                _t(__CLASS__ . 'PasswordProtected', 'Password protect resuming partial submissions')  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            )  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $pwdDescription = _t(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            __CLASS__ . '.PasswordProtectDescription',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'When resuming a partial submission, require the user to enter a password'  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $pwdCheckbox->setDescription($pwdDescription);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $fields->insertAfter(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'DisableSaveSubmissions',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $partialCheckbox = CheckboxField::create(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'ExportPartialSubmissions',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                _t(__CLASS__ . '.partialCheckboxLabel', 'Send partial submissions')  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            )  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $description = _t(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            __CLASS__ . '.partialCheckboxDescription',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'The configuration and global export configuration can be set in the site Settings'  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $partialCheckbox->setDescription($description);  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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It seems like the method you are trying to call exists only in some of the possible types.
Let’s take a look at an example:
Available Fixes
Add an additional type-check:
Only allow a single type to be passed if the variable comes from a parameter: