fix: Deal with DataObjects or Int values

[bummzack]

This PR fixes an issue with has_one relations and the TagField. Creating and updating works, but the value is not shown in the Field. I tested with #195, but this didn't solve the issue.

With this patch it's possible to use the TagField with isMultiple = false and has_one relations. Tested with Pages as well as inline editing via Gridfieldextensions.

[GuySartorelli]

I think the concern that there may not be a title field is valid - this should fallback on the ID if no title field is available. Need a $values->hasField() check.

[GuySartorelli]

I still can't get the value to display in the field - can you please include some instructions for how to set this up?
I've tried both of these:

• TagField::create('BlogTag', 'Blog Tag', BlogTag::get(), $this->BlogTag())->setIsMultiple(false)
• TagField::create('BlogTag', 'Blog Tag', BlogTag::get(), $this->BlogTagID)->setIsMultiple(false)

with the has_one as so:

private static $has_one = [
    'BlogTag' => BlogTag::class
];

[bummzack]

Hi @GuySartorelli
The field name should have an ID suffix. Eg.

TagField::create('BlogTagID', 'Blog Tag', BlogTag::get())->setIsMultiple(false)

[GuySartorelli]

Ahh okay. That makes sense. Can you please add that to the readme? Create a new section below "Relational Tags"

[bummzack]

@GuySartorelli done

[GuySartorelli]

Thanks! Works well.

The requested changes were made