DataMapper plugin providing methods to increment and decrement properties
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README.rdoc

dm-adjust

DataMapper plugin providing methods to increment and decrement properties

It provides the following function (for collections and resources):

adjust!

Person.adjust!(:salary => 1000) # increases the salary of all people with 1000.
Person.all(:age.gte => 40).adjust!(:salary => 2000) # increase salary of them oldies.
@child.adjust!(:allowance => -100) # less money for candy and concerts