Add support for Rails 3

Author: felipefava

Gemfile

@@ -2,7 +2,6 @@ source 'https://rubygems.org'
 
 gemspec
 
-
 group :test do
   gem 'rspec-rails'
   gem 'simplecov', require: false

Gemfile.lock

@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     request_params_validation (0.1.0)
-      rails (>= 5)
+      rails (>= 3)
 
 GEM
   remote: https://rubygems.org/

lib/request_params_validation/params.rb

@@ -17,7 +17,7 @@ def self.filter!(definition, params)
       extra_keys = [:controller, :action] # Keys added by Rails
 
       filter_params(definition, params, extra_keys).tap do |params|
-        params.permit! if params.is_a?(ActionController::Parameters)
+        params.permit! if params.respond_to?(:permit!)
       end
     end
 

lib/request_params_validation/params/types/validations.rb

@@ -8,6 +8,8 @@ def valid_array?(value)
 
         def valid_hash?(value)
           value.is_a?(Hash) || value.is_a?(ActionController::Parameters)
+        rescue NameError # For older versions of Rails
+          false
         end
 
         def valid_string?(value)

request_params_validation.gemspec

@@ -1,4 +1,5 @@
-$:.push File.expand_path("lib", __dir__)
+lib = File.expand_path('../lib', __FILE__)
+$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
 require 'request_params_validation/version'
 
@@ -17,5 +18,5 @@ Gem::Specification.new do |spec|
 
   spec.files         = Dir["{lib}/**/*", "MIT-LICENSE", "Rakefile", "README.md"]
 
-  spec.add_dependency 'rails', '>= 5'
+  spec.add_dependency 'rails', '>= 3'
 end