Is this even possible in cake? (model associations with unknown models)

My site is build with a lot of plugins.
Now, I used to use a 'pages' table that had the column called
'widgets'
the column contained a serialized array which contained information
about which widgets (models) should be in that page. Something like
this:

array(
[0] => array(
'name' => 'content'
'args' => array(
'id' => 1
)
)
[1] => array(
'name' => 'comments'
'args' => array(
'group_id' => 1
)
)
)

Then I had plugin-models called 'Content' and 'Comments' which had
tables like 'content_data', 'content_settings', 'comments_data' and
'comments_settings'.

Now someone told me I should never ever have an array inside a
database-table.
So I tried to do it without an array, and got up with this database
structure:

A table called 'pages'
A table called 'widgets' with columns called 'id' and 'page_id'
And all my widgets ('content_data' and 'comments_data') got an extra
column called 'widget_id'

Now I wanted to give my widgets a
var $belongsTo = array('widgets');

But I can't give my 'widgets'-model a
var $hasMany = array(?);
Cause I don't know which widgets are on a page.
Of course, I could try to associate it with EVERY widget (although I
wouldn't know how), but that would be very slow when I get a lot of
widgets.

So, how do I give it the right $hasMany-var?
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