Dredd

       .-----.
      /__ # __\
     ||  \ /  ||
     |`.  X  .'|
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     `---------'
      d r e d d

Rules over collections

Installation

$ gem install dredd

Usage

Dredd is a sort of DSL, sort of rule runner, combined.

Use it if you want to detect various outliers/exceptions within collections, detection is expressed with Dredd rules.

To start, you should have

A collection of hashes (if you have objects, #to_h them).
A Dredd rule.

Now combine the two :)

result = Dredd.detect "all{ payment > 10 }.size.gt 0",
                       [
                         { :payment => 0 },
                         { :payment => 20 },
                         { :payment => 0 }
                       ]
result # => true

Rules

Here's an assortment of queries possible with Dredd's DSL:

all.mean{ payment }
all{ payment > 10 }.sum{ payment }.is 20
first(2){ payment > 50 }

See live examples in spec/dredd/query_spec.rb

Notes

Rules are not sandboxed yet. They will be, and till then - take it into consideration, thanks.

Contributing