Hello,

I have 2 classes : "ExtMember" and "ExtMemberAdmin"

+ ExtMember.php :

class ExtMember extends Member {

	static $db = array(
		'extName' => 'Varchar'
	);

}

+ ExtMemberAdmin.php :

class ExtMemberAdmin extends ModelAdmin {
	static $url_segment = 'extMember';

	static $managed_models = array(
		'ExtMember'
	);
}

When i add a new "ExtMember" member with an already registered email, this doesn't work : the "Add" button turns, turns and turns infinitely.

If i use Firebug to view the response, i have this :

ERROR [User Error]: Uncaught ValidationException: 
IN POST /silverstripe-v2.4.1/admin/extMember/ExtMember/AddForm?action_doCreate=Ajout
Line 611 in /var/www/silverstripe-v2.4.1/sapphire/security/Member.php

Source
======
  602: 				'Member', 
  603: 				sprintf(
  604: 					"\"%s\" = '%s' %s",
  605: 					$identifierField,
  606: 					Convert::raw2sql($this->$identifierField),
  607: 					$idClause
  608: 				)
  609: 			);
  610: 			if($existingRecord) {
* 611: 				throw new ValidationException(new ValidationResult(false, sprintf(
  612: 					_t(
  613: 						'Member.ValidationIdentifierFailed', 
  614: 						'Can\'t overwrite existing member #%d with identical identifier (%s = %s))', 
  615: 						PR_MEDIUM,
  616: 						'The values in brackets show a fieldname mapped to a value, usually denoting an existing email
       address'
  617: 					),

Trace
=====
Member->onBeforeWrite()
line 936 of DataObject.php

DataObject->write()
line 859 of ModelAdmin.php

ModelAdmin_CollectionController->doCreate(Array,Form,SS_HTTPRequest)
line 300 of Form.php

Form->httpSubmission(SS_HTTPRequest)
line 137 of RequestHandler.php

RequestHandler->handleRequest(SS_HTTPRequest)
line 155 of RequestHandler.php

RequestHandler->handleRequest(SS_HTTPRequest)
line 149 of Controller.php

Controller->handleRequest(SS_HTTPRequest)
line 155 of RequestHandler.php

RequestHandler->handleRequest(SS_HTTPRequest)
line 149 of Controller.php

Controller->handleRequest(SS_HTTPRequest)
line 281 of Director.php

Director::handleRequest(SS_HTTPRequest,Session)
line 124 of Director.php

Director::direct(/admin/extMember/ExtMember/AddForm)
line 127 of main.php

I would like to know how to validate (only a unique email) "email" in a modelAdmin (like the email Member validation in Security Tab) ?

Thank you for your help,

To add validation to a DataObject that is used in Model Admin I do the following... however for "Member" this is a special case and I would have decorated or used a custom class when using this instead of just extending it... for more info that see here... http://doc.silverstripe.org/member?s[]=member#extending_member_or_dataobject

<?php

class ExampleDataObject extends DataObject
{
	static $db = array(
		'Name' => 'Text'
	);
}

class DataObject_Validator extends RequiredFields
{
	function php($data)
	{
		$bRet = parent::php($data);

		if ($data['Name'] == 'Fred')
		{
			$obj->validationError(
				'Name',
				'Name must not be Fred',
				"required"
			);

			$bRet = false;
		}

		return $bRet;
	}
}