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so sometimes you will have a fields and these fields will actually need to be validated so they will have to comply with some particular requirements that you give for example you might have an integer field but you only want to get even integers and for this case you will need to create a validator integer is even this function this function will take a value and here we will actually validate that this is even or to be more clear we will date if this value does not comply with the requirement of evenness and in this case we will actually raise the validation error so if the remain the reminder after division by 2 does not equal to zero in this case we will raise validation error that i just imported from jungle core exceptions and here well say that our value will convert to string our value is not even and then for example we have some model lets call it my model and here we would have even int for example so we will start with a simple integer field and then as we already discuss