php - Update "Properties" model when adding a new record in CakePHP -

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i'm writing application in cakephp that, now, used make quotes customers. quote model. want have separate model/table "property," may used other models.

each time user gets "add quote" action, want pull property called "nextquotenumber" or along lines, , automatically increment property, even if new quote isn't saved. don't think using autoincrement quote's id appropriate here - also, "quote number" different row's id.

i know simple enough do, i'm trying figure out "proper" cakephp way of doing it! i'm thinking should have method inside property model, "getproperty($property_name)", pull value return, , increment value... i'm not sure best way of doing is, or how invoke method quotes controller.

what should do? in advance!

i ended doing bit more specific, making model 'sequence' rather more general 'property'. sequence has 3 fields: id, name, value. since need sequence quotes starting 1001, there's 1 row (1, 'quote', 1001).

in model file sequence.php following:

class sequence extends appmodel { var $name = 'sequence';  function getnext($sequencename) {     // make transaction, 2 concurrent requests can't same value.     $this->begin();     // find sequence given object, let's 'quote'     $row = $this->find('first', array(         'conditions' => array('sequence.name' => $sequencename),         'fields' => array('id', 'value'),     ));     // save original value (before incrementing) can return it.     $value = $row['sequence']['value'];     // update value in database.     $row['sequence']['value'] = $value + 1;     $this->save($row);     // commit changes database, ending lock.     $this->commit();     return $value; }

as webbiedave pointed out, atomicity required or it's possible 2 users/quotes same sequence number, hence begin() , commit() calls.

then, in quotes_controller, added following in add() action:

$this->loadmodel('sequence'); $quotenumber = $this->sequence->getnext('quote');

then can use $quotenumber wish.

hope helps somebody, , please contribute if there's better way of doing it. thanks!


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