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Re: Filtering breaks bindings-enabled app
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Re: Filtering breaks bindings-enabled app


  • Subject: Re: Filtering breaks bindings-enabled app
  • From: mmalcolm crawford <email@hidden>
  • Date: Mon, 24 Jan 2005 21:20:15 -0800


On Jan 24, 2005, at 8:13 PM, Dan Stein wrote:

SECOND QUESTIONABLE DESIGN DECISION: I implemented a second type of filtering by creating a support table in the main document view that contains a list of all the unique strings in one of the table columns. When an item is selected from this table, the main table is filtered to display only those rows containing the selected string in the column of interest. This feature supports selecting multiple strings in the support table for aggregating rows. It also works seamlessly (for filtering, at least) with the search field in the toolbar. Looks good, but something is broken deep inside my app, because when this filter is active I can no longer force new rows into the table as I can with the search field, even though the logic that performs the filtering in the array controller's arrangeObjects: method is pretty much the same as for the search field, except that an enumerator is required to examine ( for all the rows in the main table; nested: for all selected rows in the support table: see if the string from that table matches the one in the appropriate field in the main table.)

If I don't force new entries into the filtered table, I get messages that new entries could not be inserted at the index after the last displayed item. If I do force the entries, I get two instances of the new row, which I can delete, but if I do not, the program crashes on exit with a SIGBUS.

Are you able to show code for this? In the "Filtering Controller" example the first check it to determine whether or not an object is newly inserted. If it is, it's added immediately to matchedObjects.


mmalc


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References: 
 >Filtering breaks bindings-enabled app (From: Dan Stein <email@hidden>)

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