Django coin/points system ideas -

i creating web based game in django, in action require coins/points , every action need check if userprofile has specific coins action or not. have seen awards/rewards packages seems awarding/rewarding after action has been performed. need generic solution checks if user has coins action or not.

for coins doing way:

class userprofile(models.model): .... def deduct_coins(coins):     self.coin -= coins     self.save()  def has_coins(coins):     if self.coins >= coins:        return true     return false 

i not using django forms actions before each action ( crud ) operations doing following steps:

• check if user has required coins
• perform action
• deduct coins required

1- how can make process generic.

2- there custom signals other builtin signals, if how can use them.

3- can pre_save signal used scenario.