xtext generated method are wrong in the generator

Question

Good morning, i'm new in xtext. I wrote a grammar for my dsl and in the genrator a method generated in the model give we wrong result: the grammar snipped that is wrong is: Feature:

'Feature' name=ID '{'
    'verb' verb= [Activity]
    'objects' '('(classes+=[Class] (','classes+=[Class])*)?')'
    'common' '('(common+=[Feature] (','common+=[Feature])*)?')'     
    'optional' '('(optional+=[Feature] (','optional+=[Feature])*)?')'
    'variabilities' '(' (variabilities+=[FeatureVariability] (','variabilities+=FeatureVariability])*)?')'  
    'generalization' '('(generalization+=[Feature] (','generalization+=Feature])*)?')'      
 '}';

an then have model with the following Features:

Feature f2{

         verb act1
         objects (C4, C3)
         common()
         optional(f32, f31)
         variabilities()    
         generalization()
        }

Feature f3{

         verb act1
         objects (C1, C2, C3)
         common()
         optional(f31, f32)
         variabilities()    
         generalization()
    } 

Feature f31{


         verb act2
         objects (C3)
         common()
         optional()
         variabilities()    
         generalization()
    }


Feature f32{
         verb act1
         objects (C1, C2, C3)
         common()
         optional()
         variabilities()    
         generalization()
    }

Feature f4{

         verb act1
         objects (C1, C2, C3)
         common()
         optional(f32, f31)
         variabilities()    
         generalization()
    }

Feature f1{

         verb act1
         objects (C1, C4)
         common(f2)
         optional(f31)
         variabilities()          
         generalization()}    

when i display the features names, common's size common's contains , optional

size optionnal size, optionnal contain, i have the following results:

feature name:f2, size of common:2 common featuresf32,f31

feature name:f2, size of optional:2 optional featuresf32,f31

feature name:f3, size of common:2 common featuresf31,f32

feature name:f3, size of optional:2 optional featuresf31,f32

feature name:f31, size of common:0 common features

feature name:f31, size of optional:0 optional features

feature name:f32, size of common:0 common features

feature name:f32, size of optional:0 optional features

feature name:f4, size of common:2 common featuresf32,f31

feature name:f4, size of optional:2 optional featuresf32,f31

feature name:f1, size of common:2 common featuresf2,f31

feature name:f1, size of optional:2 optional featuresf2,f31

but when i use Junit to test, everithing is ok. thanks for your help

Answer 1

make sure if you work with your feature lists in the validator and generator, that you dont accientially do a model2model transformation e.g.

feature.common + feature.optional