problems populating my select box

Hi there, newbie here.

I have a campaign model and a charity model. Campaign belongsTo
Charity and Charity hasMany Campaigns.

I have a form which creates a campaign and I need a select box to have
the name of all the charities. What I have at the minute is what cake
baked for me and it creates a select box for the charities but it has
their ids rather than the charity's name.

From the documentation I changed it to:

in the controller:
$users = $this->Campaign->User->find('list');
$charities = $this->Campaign->Charity->find('list');
$this->set(compact('users', 'charities'));

in the view:
echo $this->Form->input('Charity.charity_name');

(I also tried)
echo $this->Form->input('Charity', array('type'=>'select',
'options'=>'$charities'));

but I can get neither to work. I've googled and not found an answer I
understand.

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