Dictionary and Association

Hi,

I don't understand what's wrong with this one:

st> dict := Dictionary new
Dictionary (
)
st> assoc := Association key: #key1 value: 'value1'
#key1->'value1'
st> dict add: assoc
#key1->'value1'
st> dict
Dictionary (
        #key1->'value1'
)
st> assoc key: #key2 value: 'value2'
#key2->'value2'
st> dict
Dictionary (
        #key2->'value2'
)
st> dict add: assoc
#key2->'value2'
st> dict
Dictionary (
        #key2->'value2'
        #key2->'value2'
)

best regards



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Hi,

you can simply do:

dict := Dictionary new.
dict at: #key1 put: 'value1'.
dict at: #key2 put: 'value2'.

In your case the problem is the assoc variable (you just change the
content) here is the solution:

dict := Dictionary new.
assoc := Association key: #key1 value: 'value1'. " or #key1->'value1' "
dict add: assoc.
assoc := Association key: #key2 value: 'value2'. " or #key2->'value2' "
dict add: assoc.

Gwen

On 04/06/2011 02:43 PM, Wolfgang Dann wrote:

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Am Mittwoch, den 06.04.2011, 15:07 +0200 schrieb Gwenael Casaccio:
I wanted to subclass Association to store a Bookmark.
If i understand you right, then i have to
always send new when the key changes.

thank you in advance




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On 04/06/2011 03:25 PM, Wolfgang Dann wrote:
> I wanted to subclass Association to store a Bookmark.
> If i understand you right, then i have to
> always send new when the key changes.

Sets and Dictionaries are not able to store objects or keys
(respectively for Sets and Dictionary) that change.  When you have a
change you need to take out the object (association for Dictionary),
change it and put it back.

Usually Associations are considered an implementation detail and you put
the Bookmark as the value.  You can then define a BookmarkList that
includes a Dictionary or LookupTable and automatically manages the
key->bookmark association so that the collection stays consistent.

Paolo

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