Object Mapper

Object Mapper provides interface for operations above set of objects in single call. Binds method calls to all contained objects according to specified rules. So, for example, it's possible to work with many hashes by rather native way as with single one without necessity to merge them. For example:

require "mapper"

h1 = {:a => :b}
h2 = {:c => :d}
h3 = {:a => :e}

hashes = Mapper[h1, h2, h3]
hashes.some.has_key? :a         # will return true
hashes.some[:c]                 # will return :d

Conditions according which some reductor will return value can be changed. (It simply converts returned value of hash to boolean and returns it if conversion is true.) Let's change selector:

hashes.some{ |v| v == :e }[:a]       

# will return :e, because :b conversion of first hash to boolean 
# is false, so will continue to second and then to third hash where 
# :a will return :e which is correct and therefore it will 
# be returned

This example is slightly non-sense for practical use, of sure, but demonstrates how selector works well. Second available reductor is all which simply returns all results of method calls for each hash (in array):

hashes.all.has_key? :a          # will return [true, false, true]

1. Fork it.
2. Create a branch (git checkout -b 20101220-my-change).
3. Commit your changes (git commit -am "Added something").
4. Push to the branch (git push origin 20101220-my-change).
5. Create an Issue with a link to your branch.
6. Enjoy a refreshing Diet Coke and wait.

Copyright © 2011 Martin Kozák. See LICENSE.txt for further details.