16 Oct
2007
16 Oct
'07
10:47 p.m.
Hello all,
In Ramon's blog [1] he mentions:
"When creating a description for that collection, I can specify my
custom #accessor: rather than using the default #selectorAccessor:
which then writes to my domain object with #addUser: and
#removeUser:."
Looking at the code, I don't see how this is done. Isn't the write
accessor going to get a complete collection? Is the idea to just diff
the received collection from the one the object had and make calls to
#add and #remove as appropriate, or is there a way to only be told
about the new objects in the collection?
Thanks,
Jason
[1] http://onsmalltalk.com/programming/smalltalk/using-magritte-with-seaside/
17 Oct
17 Oct
12:58 a.m.
In Ramon's blog [1] he mentions:
"When creating a description for that collection, I can
specify my custom #accessor: rather than using the default
#selectorAccessor:
which then writes to my domain object with #addUser: and
#removeUser:."
Looking at the code, I don't see how this is done. Isn't the
write accessor going to get a complete collection? Is the
idea to just diff the received collection from the one the
object had and make calls to #add and #remove as appropriate,
or is there a way to only be told about the new objects in
the collection?
Thanks,
Jason
That's exactly what I do. When I encapsulate a collection, I always provide
the following
#pluralCopyOfCollection
#addX:
#removeX:
So...
#people
#addPerson:
#removePerson:
This doesn't work with Magritte expecting to be able to set the whole
collection, so I use a custom accessor that removes items not contained in
the new collection, and adds items not contained in the old collection. It
requires a little reflection and a pluralize method to infer the collection
name from the singular selector it's invoked with, i.e. #person for above
sample.
Ramon Leon
http://onsmalltalk.com
3:38 a.m.
New subject: Pier-tree in IE
I have not had much success with the tree view in IE. It seems to cop
out at depths > 2 or 3
Is this a known issue?
Keith
8:08 a.m.
Ah, I see. How hard do you think it would it be to create a new
MAToManyDescription (or Container or whatever) subclass that worked
like this [1]? This seems like a common pattern so it might be a good
extension to the framework, and I don't think it would be very hard.
The component must already be calling add on a collection, so that add
call just needs to be selected by the subclass. Another option might
be to exchange the collection the memento uses now for a special
collection that overrides the #add and #remove methods. I'll take a
look at this today if I get a chance.
Thanks for the clarification. I hope you find time/interest in doing
more blog entries about doing things in Seaside/Magritte/Pier. :)
[1] Just to be totally clear for all, by "like this" I mean; have a
"read: whole collection", "modify: add to collection" and
"modify:
remove from collection", instead of just "read: whole
collection"/"write: whole collection".
On 10/17/07, Ramon Leon <ramon.leon(a)allresnet.com> wrote:
In Ramon's
blog [1] he mentions:
"When creating a description for that collection, I can
specify my custom #accessor: rather than using the default
#selectorAccessor:
which then writes to my domain object with #addUser: and
#removeUser:."
Looking at the code, I don't see how this is done. Isn't the
write accessor going to get a complete collection? Is the
idea to just diff the received collection from the one the
object had and make calls to #add and #remove as appropriate,
or is there a way to only be told about the new objects in
the collection?
Thanks,
Jason
That's exactly what I do. When I encapsulate a collection, I always provide
the following
#pluralCopyOfCollection
#addX:
#removeX:
So...
#people
#addPerson:
#removePerson:
This doesn't work with Magritte expecting to be able to set the whole
collection, so I use a custom accessor that removes items not contained in
the new collection, and adds items not contained in the old collection. It
requires a little reflection and a pluralize method to infer the collection
name from the singular selector it's invoked with, i.e. #person for above
sample.
Ramon Leon
http://onsmalltalk.com
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3 comments
3 participants
participants (3)
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Jason Johnson -
Keith Hodges -
Ramon Leon