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Data Model Questions

How to call a method on a data object


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svinkle

17 January 2009 at 5:47am Community Member, 16 Posts

Regarding thread #143123 (http://www.silverstripe.org/archive/show/143123),

How do I call a method on a data object? In willr's response, he does not call the method anywhere in the data object. How does this work?

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svinkle

17 January 2009 at 5:56am Community Member, 16 Posts

Here's another post with the same issue. http://www.silverstripe.org/archive/show/117959

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UncleCheese

17 January 2009 at 6:28am 4085 Posts

Yeah, that's kind of tricky.

He defines the method getImageFileName(), and you'll see in the table, he sets up a field for ImageFileName in the table headings array. If Silvesrtripe doesn't find a property or field called ImageFileName, it knows to try running a method called getImageFileName.

It's all done with the wildcard methods in PHP5, __get() and __call(). Very cool stuff.

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svinkle

17 January 2009 at 8:01am Community Member, 16 Posts

Hi UncleCheese,

Thanks for the information. It has helped me to understand what is happening here.

Unfortunately I still have an issue. I have everything set up correctly but the method does not return anything. Not even a simple string return for testing. I think I'm at the same point as described in thread #117959 linked above.

Why would there be no return value?
Thank you.

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dio5

21 January 2009 at 2:41am Community Member, 501 Posts

It seems to work for me on 2.2.3 if that helps :)

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svinkle

21 January 2009 at 5:37am Community Member, 16 Posts

Hi dio5,

That is interesting. The version I'm working with is 2.3 rc2. It makes me nervous to potentially use this version in a production environment if something as basic as calling a method on a data object doesn't work.

Here's an example of my code:

class LinksTable extends Page {

static $many_many = array(
'LinksTable1' => Links',
);

function getCMSFields() {
$fields = parent::getCMSFields();

$LinksTable1tablefield = new ManyManyComplexTableField(
$this,
'LinksTable1',
'Links',
array(
'LinkName' => 'Link Name',
'LinkTitle' => 'Link Title',
'LinkLocation' => 'Link URL',
'LinkColumnName' => 'Link Column'
),
'getCMSFields_forPopup'
);
$LinksTable1tablefield->setAddTitle( 'New Link' );
$LinksTable1tablefield->setPageSize(25);

return $fields;
}

}

The field in question is "LinkColumnName". In the database this data is stored as type 'Int'. I want to display a text value on output, depending on the return value.

The function being called, as it is right now:

class Links extends DataObject {
static $db = array(
'LinkName' => 'Text',
'LinkTitle' => 'Text',
'LinkLocation' => 'Text',
'LinkColumn' => 'Int'
);

static $has_one = array(
);

static $belongs_many_many = array(
'LinksTable1' => 'LinksTable'
);

function getCMSFields_forPopup() {
$options = array('1'=>'Column One','2'=>'Column 2','3'=>'Column 3');

$fields = new FieldSet();
$fields->push( new TextField( 'LinkName', 'Link Name' ) );
$fields->push( new TextField( 'LinkTitle', 'Link Title' ) );
$fields->push( new TextField( 'LinkLocation', 'Link URL' ) );
$fields->push( new DropdownField('LinkColumn', 'Link Column', $options));
return $fields;
}

function getLinkColumnName() {
return "test";
}

}

This should return "test" in each row of the "LinkColumnName" column, but it returns nothing.

Any insight would be appreciated.

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dio5

21 January 2009 at 9:29am Community Member, 501 Posts

Hmm, would indeed expect this to work (unless I overlooked something).

Any chance you could try this on a 2.2.3 to make sure it's the version difference?

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svinkle

22 January 2009 at 6:15am Community Member, 16 Posts

Hi dio5,

I tried my code in 2.2.3 today with no success. The same results occurred with blank fields.

Would it be possible for you to share a code sample which works in 2.2.3?

Thanks.

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