R – Copy from one NSTableView to another (With Core Data Bindings)

copycore-dataiphonenstableview

I have a NSTableView binded to core data. I have another NSTableView, currently not binded to anything ( but that can change if need be).

When a press a button, I want the currently selected Row in the first table to be copied (but not removed) to the second table.

e.g.

Before:

First Table

Column1 | Column2 | Column3
Person  | Place   | Time

Second Table

Column1 | Column2 | Column3
        |         |

After:

 Column1 | Column2 | Column3
 Person  | Place   | Time

Second Table

 Column1 | Column2 | Column3
 Person  | Place   | Time

How would I go about doing this?

Thanks!

Best Answer

This isn't really an issue with NSTableView, this is more a matter of program design. What do your NSTableViews display? Data. In order to take the selected object in one table view and make it appear in another, you need to figure out what data object is selected, and add it to the data set for the other table view so that it appears there, too.

It sounds like you're using bindings. If so, then you should bind your second table view to an array controller that tracks the objects that should be displayed there. Whether you need to bind that array controller to a content set depends on your application.

So, to get the selected item, check out the selectedObjects method on NSArrayController. This gives an array of the currently selected objects. You'll then need to add the selected objects to the array controller for the second table view. Once you do that, the bindings will work their magic and update your table view automatically.

Related Solutions

Sql – Copy tables from one database to another in SQL Server

SQL Server Management Studio's "Import Data" task (right-click on the DB name, then tasks) will do most of this for you. Run it from the database you want to copy the data into.

If the tables don't exist it will create them for you, but you'll probably have to recreate any indexes and such. If the tables do exist, it will append the new data by default but you can adjust that (edit mappings) so it will delete all existing data.

I use this all the time and it works fairly well.

Php – function to make a copy of a PHP array to another

In PHP arrays are assigned by copy, while objects are assigned by reference. This means that:

$a = array();
$b = $a;
$b['foo'] = 42;
var_dump($a);

Will yield:

array(0) {
}

Whereas:

$a = new StdClass();
$b = $a;
$b->foo = 42;
var_dump($a);

Yields:

object(stdClass)#1 (1) {
  ["foo"]=>
  int(42)
}

You could get confused by intricacies such as ArrayObject, which is an object that acts exactly like an array. Being an object however, it has reference semantics.

Edit: @AndrewLarsson raises a point in the comments below. PHP has a special feature called "references". They are somewhat similar to pointers in languages like C/C++, but not quite the same. If your array contains references, then while the array itself is passed by copy, the references will still resolve to the original target. That's of course usually the desired behaviour, but I thought it was worth mentioning.

Best Answer

Related Solutions

Sql – Copy tables from one database to another in SQL Server

Php – function to make a copy of a PHP array to another

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