Another design choice I see go both ways is whether to perform validation in
the save() method or to call each method separately. Example controller
functions could be (pseudo code):
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- - - - - - -
*SEPARATE SAVE & VALIDATE
*var UserService=getBean('UserService');
var FormVariables=getAllValues();
var ValidationResult='';
var SaveResult='';
set ValidationResult=UserService.validate(FormVariables); // returns an
error collection object
if ValidationResult.hasErrors()
setValue('ReturnObject', ValidationResult);
addResult('Fail');
else
set SaveResult=UserService.save(FormVariables); // returns a populated
user bean object
setValue('ReturnObject', SaveResult);
addResult('Success');
end
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- - - - - - -
*COMBINED SAVE & VALIDATE V1.0
*var UserService=getBean('UserService');
var FormVariables=getAllValues();
var UserBean=UserService.newUser();
var SaveResult='';
set UserBean.setMemento(FormValues);
set SaveResult=UserService.save(UserBean); // returns true if saved
successfully, or false if validation errors exist (the error collection
would be saved in the bean itself for retrieval later)
setValue('ReturnObject', UserBean);
if SaveResult is True
addResult('Success');
else
addResult('Fail');
end
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- - - - - - -
*COMBINED SAVE & VALIDATE V2.0
*var UserService=getBean('UserService');
var FormVariables=getAllValues();
var SaveResult=UserService.save(FormVariables); // returns a complex result
object with properties: STATUS ('Success', ValidationError') and PAYLOAD
(that contains either a UserBean or ErrorCollection depending on the STATUS)
setValue('ReturnObject', SaveResult.getPayload());
if SaveResult.getStatus() is 'Success'
addResult('Success');
else SaveResult.getStatus() is 'Validation'
addResult('Fail');
end
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- - - - - - -
CONS OF KEEPING THEM SEPARATE:
- Controller has to be smarter, which is bad, because there will be
more code duplication if you change the presentation layer to flex, for
example.
- Function coupling: Coders have to "remember" to always validate()
before saving() - an unnecessary additional complexity (unless, of course,
there are times in your app where you save() by defining all values yourself
(thereby knowing the values are correct) rather than from user input)
CONS OF COMBINING THEM COMBINED
- Requires complex and unnatural result handling (either by affecting
the bean by reference, or using a special RESULT object)
Cheers,
Baz
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