Class: MongoInspiredCompare

Inherits:
Object
  • Object
show all
Defined in:
lib/mongo_inspired_compare.rb

Class Method Summary collapse

Class Method Details

.compare(val, criterion) ⇒ Object

Takes a value and a comparitor and returns true or false

Basic Comparisons

> MongoInspiredCompare.compare( 5, 5 )

> true

> MongoInspiredCompare.compare( 5, 6 )

> false

Basic Operators

> MongoInspiredCompare.compare( 5, “$gte”=>5 )

> true

> MongoInspiredCompare.compare( 5, “$lt”=>5 )

> false

> MongoInspiredCompare.compare( 5, 2, 3, 4, 5] ) /Users/daviddo/Documents/mongo_inspired_compare/lib/mongo_inspired_compare.rb:13: warning: constant ::Fixnum is deprecated

> true

> MongoInspiredCompare.compare( 5, 2, 3, 4, 5] )

> false

Nesting

> MongoInspiredCompare.compare( 5, “$in”=>[{“$lt”=>5, “$gte”=>5]} )

> true

And/or Operators

> MongoInspiredCompare.compare( 5, “$or”=>[{“$lt”=>5, “$gte”=>5]} )

> true

> MongoInspiredCompare.compare( 5, “$and”=>[{“$lt”=>5, “$gte”=>5]} )

> false

Invariance

> MongoInspiredCompare.compare( “5”, “$gte”=>5 )

> true

> MongoInspiredCompare.compare( “5x”, “$gte”=>5 )

> false



49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
 
# File 'lib/mongo_inspired_compare.rb', line 49

def self.compare( val, criterion ) 
  if criterion.class != Hash
    val == criterion
  else
    # v might look like { "$gte" => 12, "$lt" => 1 }
    criterion.all? do |oper,v2|
      if (v2.class == Float or v2.class == Integer or v2.class == Fixnum) and val.class == String
        num_val = numerical(val)
      else
        num_val = val
      end
    
      if oper == "$in" # "$in" => [">4000", {"$gt" => -100 }]
        v2.any? {|v3| compare( val, v3)}
      elsif oper == "$nin" # "$in" => [">4000", {"$gt" => -100 }]
        !v2.any? {|v3| compare( val, v3)}
      elsif oper == "$or"
        v2.any? {|v3| compare( val, v3)}
      elsif oper == "$and"
        v2.all? {|v3| compare( val, v3)}
      elsif num_val == nil
        false
      elsif oper == "$gte"
        num_val >= v2
      elsif oper == "$gt"
        num_val > v2
      elsif oper == "$lte"
        num_val <= v2
      elsif oper == "$lt"
        num_val < v2
      else
        raise "Error: unknown operator #{ oper }"
      end
    end
  end
end