Allow for parameters in method names

[amattsmith]

Currently, Ruleby does not allow for parameters in method names. For example, the following is not allowed:

[m.get(:name) == ’Joe’]

This needs to be accepted in all syntaxes. Other cases where this is need include:

[m[:name] == ’Joe’]

The Atoms and Nodes are already prepared to accept the arguments. The only area of development needed is in the DSLs.

original LH ticket

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[pablomarti]

Hi, I have started using Ruleby and I need to do this and I'm getting the error: "Arguments not supported for short-hand conditions" .

I found:

class MethodBuilder
public_instance_methods.each do |m|
a = [:method_missing, :new, :public_instance_methods, :send, :id]
undef_method m.to_sym unless a.include? m.to_sym
end

  def method_missing(method_id, *args, &block)
    ab = AtomBuilder.new method_id
    if block_given?
      args.each do |arg|   
        ab.bindings.push BindingBuilder.new(arg, method_id)
      end
      ab.block = block
    elsif args.size > 0
      puts args.class.to_s + ' --- ' + args.to_s
      raise 'Arguments not supported for short-hand conditions' 
    end
    return ab
  end
end

So I think it is impossible to call a method with params in the conditions; do you know if there is another way to do this? Or how may I edit this collection of methods? Which files do I have to edit?

Thanks in advance, keep rocking!

[jkutner]

No, it's not possible to pass the arg because it would mess up the caching mechanism in ruleby (i.e. the result of a method could differ based on the argument).

Instead, you can just a lambda like this:

rule [Fact, :a, where {
    lambda {|a| a.is_something?("my_arg")}
}] do |v|
  //...
end

hope that helps

On Aug 22, 2012, at 11:31 AM, Pablo Martí wrote:

Hi, I have started using Ruleby and I need to do this and I'm getting the error: "Arguments not supported for short-hand conditions" .

I found:

class MethodBuilder

publicinstance_methods.each do |m|
a = [:method_missing, :new, :public_instance_methods, :send, :id_]
undef_method m.to_sym unless a.include? m.to_sym
end

def method_missing(method_id, *args, &block)
ab = AtomBuilder.new method_id
if block_given?
args.each do |arg|
ab.bindings.push BindingBuilder.new(arg, method_id)
end
ab.block = block
elsif args.size > 0
puts args.class.to_s + ' --- ' + args.to_s
raise 'Arguments not supported for short-hand conditions'
end
return ab
end
end
So I think it is impossible to call a method with params in the conditions; do you know if there is another way to do this? Or how may I edit this collection of methods? Which files do I have to edit?

Thanks in advance, keep rocking!

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[pablomarti]

Hey cool! Thank you very much!