Feature/output group

[mringler]

Allows declaring output groups on columns and foreign key relations in schema.xml. Passing a group name to the toOutputGroup() method on the model or ObjectCollection returns an array holding all values defined by the group name.

So in schema.xml:

<table name="le_table">
  <column name="col1" outputGroup="foo,bar" />
  <column name="col2" />
  <foreign-key phpName="fk" outputGroup="foo">
    ...

On an object:

leTableObject->toOutputGroup('foo'); // will return ['Col1' => ..., 'Fk' => ...]
leTableObject->toOutputGroup('bar'); // will return ['Col1' => ...]

Instead of a group name, an array with model class names can also be used:

leTableObject->toOutputGroup([
  LeTable::class => 'foo',
  'default' => 'bar'
]);

It automatically skips recursive output:

toArray	toOutputGroup
[ 'event' => [ 'event_id' => 1, 'event_type' => [ 'event_type_id' => 1, 'events' => [[*RECURSION*]] ] ] ]	[ 'event' => [ 'event_id' => 1, 'event_type' => [ 'event_type_id' => 1, ] ] ]

I find this much easier than using a serializer as I don't have to re-iterate all columns in another file.

[mringler]

closed in favor of #9