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18 July 2012 at 1:55am
We have an intern going through the tutorials on SS3 at the moment and an interesting issue has cropped up. Part of the tutorial revolves around setting up a has_one relationship from a page to a DataObject. The tutorial continues to use HasOneComplexTableField which throws a warning and does not work without setting PHP to ignore notices etc.
My question is, what is the new SS3 way of managing has_one data object relationships?
GridField currently looks like it only manages 1-many and many-many relationships, or at least that is what all the various docs and tutorials revolve around. There does not seem to be any evidence of a way to manage has_one relationships directly.
As a work around we are looking at a drop down for setting the relationship and a GridFieldConfig_RecordEditor setup for managing the DataObjects. Is this the only way right now or are we missing something obvious or undocumented?
25 August 2012 at 4:36am
I would also quite like to know this.
The snippets I have read so far indicate this should be possible through GridField, but not really sure how...
27 September 2012 at 4:57am
That could be very useful. In fact, i am looking for a solution as well. anyone ?
2 October 2012 at 10:23pm Last edited: 2 October 2012 10:28pm
I also don't know about any generic solution but I followed the "dropdown" approach mentioned above. This works quite well if there are not too many objects to choose from for the has_one relation.
I have a (potentially big) product list with products of only a few categories. Every Category has an associated Icon with a short descriptive Text. I therefore need a has_one relation (Product->Icon) and a has_many relation (Icon->Product)
Product is a Page, Icon is a DataObject.
The Icon DataObject is standard, as in all tutorials.
In the Product Page I use a GridField RecordEditor for adding and deleting the Icon DataObjects:
$icoconfig = GridFieldConfig_RecordEditor::create();
$idl = DataList::create('ProductIcon'); // get _all_ ProductIcon DataObjects!
$iconfield = new GridField(
'All Icons Grid', // Field name
'Product Icons', // Field title
$fields->addFieldToTab('Root.All Icons', $iconfield);
For relating one specific Icon to the Product I then use a DropdownField:
$drop = new DropdownField('MyIconID', 'Select Icon', ProductIcon::get()->map('ID','Name'));
$drop->setEmptyString('No Icon'); // Used for "no icon" input
BTW: The ->map() function shows the Icon Name in the Dropdown Field whereas it uses the "ID" as selected value!
The MyIconID Table row gets added automatically if you have the according $has_one relation set up in the Product Page
static $has_one = array(
'MyIcon' => 'ProductIcon'
I hope this is helpful ant it's clear what I meant. If it is not, please ask again and I will try to improve what I have written. Overall it is just an explanation/example of the dropdown idea from the first post and it is only feasible if there are not too many DataObjects to choose from. A generic approach via GridField would therefore be very nice but in the meantime this might help. I have set it up that way and it works for me.
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