Comments (7)
The reason the mapping plugin does not do this, is that there is no clean way to signal deletions.
from knockout.mapping.
I think it would be alright to not be expected to support deletions this way. I mean, there really isn't a clean way to do it. So, one might be expected to explicitly call a mappedRemove(key).
but I can dig it if you don't want to add it to the library.
from knockout.mapping.
No, I think this alternate behavior could also be a nice feature. But it
would have to be explicitly enabled using a mapping configuration option.
This way it wouldn't break any existing code.
If you can add a pull request implementing that, it would be very welcome :)
On Fri, Dec 9, 2011 at 17:40, Matthew Taylor <
[email protected]
wrote:
I think it would be alright to not be expected to support deletions this
way. I mean, there really isn't a clean way to do it. So, one might be
expected to explicitly call a mappedRemove(key).but I can dig it if you don't want to add it to the library.
Reply to this email directly or view it on GitHub:
from knockout.mapping.
turn it on like this?
var vm = ko.mapping.fromJS([], { arrayUpdate: true, arrayInsert:true });
from knockout.mapping.
well, more something along the lines of { incrementalArrayUpdates: true }
to indicate that what you receive from the server is an incremental update,
instead of a 'full' state.
additionally, if the data from the server contains a "_destroy" property in
an array, that could be an indication to delete (similar to what you can do
with array.destroy(item) in an observable array).
On Fri, Dec 9, 2011 at 19:13, Matthew Taylor <
[email protected]
wrote:
turn it on like this?
var vm = ko.mapping.fromJS([], { arrayUpdate: true, arrayInsert:true });
Reply to this email directly or view it on GitHub:
from knockout.mapping.
I gave this a shot; but I'm out of time. the updateViewModel function is hard to get my mind around. I kept breaking other unit tests without actually getting my change to work. I strongly feel that the function is too large and needs to be refactored into smaller chunks.
I'm giving up for now. I might come back to it later.
from knockout.mapping.
Fair enough, development of the plugin has been fairly, shall we say, iterative :) So there is definitely a lot to be gained by cleaning it up. Sadly, with limited time on my side this has fallen by the wayside.
By the way, if you have any suggestions on restructuring the code and so on, by all means let me know. Good suggestions are always welcome!
from knockout.mapping.
Related Issues (20)
- mapping fails if value = "constructor" HOT 2
- Is there a way to update the nested properties of the items of an ObservableArray? HOT 1
- Method visitPropertiesOrArrayEntries is doing unnecessary iterations on updateViewModel because the wrong variable is being used to check against ignored properties.
- Mapping not saved when data is an array HOT 1
- Mapping doesn't work when properties listed in different order HOT 4
- Empty observe array in mapping options creates observables from all properties HOT 1
- ko.mapping.toJSON to implement JSON formatting param like ko.toJSON
- Calling fromJS to amend an existing model with an ObservableArray fails
- NuGet package install directory
- Questions about Knockout Mapping HOT 10
- The "create" handler does not work with non-array properties HOT 1
- Create handler causes mapping to evaluate pureComputed HOT 1
- Suggestion: Safely update mapping when property in new object happens to be null
- mapping partial model into existing viewModel
- [Question] is arrayChanged part of the public api?
- objectLookup() + "watch" + Firefox = hilarity
- bug of optimizedKeys
- optionsCaption causes bound "value" to be deleted
- Doesn't seem to work with KO 3.4.2 HOT 1
- Having redudant data passed to an object makes it so the second reference of the same object is not updated
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