Thanks Denis. 

> There is refactoring which sadly not available from menu. But you can 
> evaluate it manually:
> 
> (RBGenerateEqualHashRefactoring className: #YourClass variables: #(var1 
> var2)) execute

My problem is display in this image.

In the left the inspector display all the items in the bag ( it's right )

In the right the inspector display the relative  Occurences,    but some are 
set to 0.
 




Because ?

        Thanks for considerations,

                Dario

> 2017-02-20 13:46 GMT+01:00 Trussardi Dario Romano 
> <dario.trussa...@tiscali.it>:
> Ciao,
> 
>         i works with Pharo 4.0 environment.
> 
>         I have a class Product  with some instance variable and the      =    
>   method set to:
> 
>         = anItem
> 
>         anItem ifNil:[^false].
> 
>         anItem class = self class ifFalse:[ ^false].
> 
>         ^  rfrConsegna  = anItem rfrConsegna
>                                 and:[ rfrSubTable  = anItem rfrSubTable
>                                         and:[ rfrDcm = anItem rfrDcm
>                                                 and:[ indexRiga = anItem 
> indexRiga
>                                                         and:[ referenceTime = 
> anItem referenceTime
>                                                                 and:[ 
> consumer = anItem consumer
>                                                                         and:[ 
> item = anItem item
>                                                                               
>   and:[ opzioniVoce  = anItem opzioniVoce
>                                                                 ]]]]]]]
> 
>         Some of these variables are instances  of classes with specific 
> implementation and some variables themselves.
> 
> 
>         I set the relative hash method to:
> 
>         hash
> 
>         ^ rfrConsegna hash
>                 bitXor:( rfrSubTable  hash
>                         bitXor: ( rfrDcm hash
>                                 bitXor: ( indexRiga hash
>                                         bitXor: ( referenceTime hash
>                                                 bitXor: ( consumer   hash
>                                                         bitXor: ( item   hash
>                                                                 bitXor: ( 
> opzioniVoce  hash
> 
>                                 )))))))
> 
>         Now when add some setup instances of class Product  to a bag,
> 
>                  the relative inspector report
> 
>                 some aProduct entry but with some Occurences of this set to 0.
> 
>                 aProduct1       3
>                 aProduct2       0
>                 aProduct3       0
> 
> 
>         Some consideration about it ?
> 
>         Some references about hash implementations ?
> 
>         Thanks,
> 
>                 Dario
> 
> 
> 

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