Match with constraint counting

gistfile1.rb

"identity:7" => [1,2,4]
"realm:mittap" => [1,3,4]
"body:'Hello…' => [4]

1: rule: {identity: 7, realm: 'mittap'}, number_of_constraints: 2
2: rule: {identity: 7}, number_of_constraints: 1
3: rule: {identity: 8, realm: 'mittap'}, number_of_constraints: 2
4: rule: {identity: 7, realm: 'mittap', body: "Hello from number 7"}, number_of_constraints: 3

message = {identity: 7, body: "Hello from number 7"}

single_constraint_match = find_applicable_rules(message) => [1,2,4,1,3,4,4]

count_matches(single_constraint_match)
=> 1 => 2 
   2 => 1 
   3 => 1 
   4 => 3