Advanced Custom Validators

You can use multiple custom validators or pass in arbitrary data to custom validators by specifying the validator name as the key in the rules struct.

//sample custom validator constraints
this.constraints = {
  myField = {
    UniqueInDB = { 
      table= "table_name", 
      column = 'column_name' 
    }    
  }
};

This example will look for a UniqueInDBValidator in WireBox and pass in { table = "table_name", column = "column_name" } to the validate method.

//sample validator
/**
* UniqueInDB validator. This checks and returns fals if value is already present in DB
*/
component singleton implements="cbvalidation.models.validators.IValidator" accessors="true"  {
	/**
	 * Constructor
	 */
	UniqueInDB function init(){
		variables.Name = "UniqueInDBValidator";
		return this;
	}
	
	/**
	* validate
	*/
	boolean function validate(
		required cbvalidation.models.result.IValidationResult validationResult,
		required any target,
		required string field,
		any targetValue,
		any validationData
	){
		//check validationdata
		if ( !IsStruct(validationData ) ) {
			throw(message="The validator data is invalid: #arguments.validationData#, it must be a struct with keys 'table' = 'tableName' and 'column' = 'columnName'");
		}
		//check validationdata
		if ( !structKeyExists(validationData,"table") || !structKeyExists(validationData,"column") ) {
			throw(message="The validator data is invalid: #serializeJSON(validationData)# it must be a struct with keys 'table' = 'tableName' and 'column' = 'columnName'");
		}

		var myParams = { table =validationData.table, column=validationData.column, columnvalue=targetValue };
		var sql = "Select #validationData.column# from #validationData.table# where #validationData.column# = :columnvalue";
		var myQuery = queryExecute(sql, myParams);
		// This sample only validates NEW records, additional code is necessary for EDITING existing records
		if  (myQuery.recordcount == 0) { 
			return true 
		} 
		// error messages definieren
		var args = {
			message="The value #targetValue# is not unique in your database",
			field=arguments.field,
			validationType=getName(),
			validationData=arguments.validationData
		};
		var error = validationResult.newError(argumentCollection=args).setErrorMetadata({table=validationData.table, column=validationData.column});
		validationResult.addError( error );
		return false;
	}

	/**
	* getName
	*/
	string function getName(){
		return variables.Name
	}
}

Using these advanced techniques you can build reusable validators that accept the data they need in the validationData struct. You can also include multiple custom validators just by specifying each of them as a key.

If you don't have any custom data to pass to a validator, just pass an empty struct ({})

WARNING: You can't do a normal wirebox mapping for YourOwnValidator in your main application. A validator needs an IValidator interface from the cbvalidation module. When wirebox inspects the binder, the cbvalidation module is not loaded yet, so it will error. This can be solved by defining your custom validators in an own module (depending on cbvalidation) or by mapping your validator in the afterConfigurationLoad() method of your binder, e.g in config/wirebox.cfc