Class: ErpRules::RulesEngine::Context

Inherits:
OpenStruct
  • Object
show all
Defined in:
lib/erp_rules/rules_engine/context.rb

Overview

OpenStruct is part of ruby stdlib This class adds methods to allow hash-like behavior

Instance Method Summary collapse

Constructor Details

#initialize(hash = nil) ⇒ Context

Returns a new instance of Context.



11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
 
# File 'lib/erp_rules/rules_engine/context.rb', line 11

def initialize(hash=nil)
  if hash
    hash.each do |k,v|
      if v.class == Hash
        result = ErpRules::RulesEngine::Context.new(v)
        hash[k] = result
      elsif v.class == Array
        v.map! do |item|
          #ostruct requires objects passed to it on the constructr
          #to support #each
          if item.is_a? Enumerable
            ErpRules::RulesEngine::Context.new(item)
          else
            item
          end
        end
        #end Array case
      end
    end
  end
  super(hash)
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(mid, *args) ⇒ Object

need this method in order to mimic []= behavior using the method/attr syntax of OpenStruct



56
57
58
59
60
61
 
# File 'lib/erp_rules/rules_engine/context.rb', line 56

def method_missing(mid, *args)
  if args[0].class == Hash
    args[0] = ErpRules::RulesEngine::Context.new(args[0])
  end
  super(mid, *args)
end

Instance Method Details

#[](key) ⇒ Object 



34
35
36
 
# File 'lib/erp_rules/rules_engine/context.rb', line 34

def [](key)
  send(key)
end

#[]=(key, *args) ⇒ Object

This will set a method on the struct using array syntax. Trying to set the argument in eval led to an error, hence the ‘send’ call following it.



43
44
45
46
47
48
49
50
51
52
 
# File 'lib/erp_rules/rules_engine/context.rb', line 43

def []=(key, *args)
  arg = args[0]
  eval("#{key} = nil", binding)

  if arg.class == Hash
    send("#{key}=", ErpRules::RulesEngine::Context.new(arg))
  else
    send("#{key}=", arg)
  end
end