Make ransack a soft dependency. Closes #64

Author: stas

jsonapi.rb.gemspec

@@ -21,11 +21,11 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
 
   spec.add_dependency 'jsonapi-serializer'
-  spec.add_dependency 'ransack'
   spec.add_dependency 'rack'
 
   spec.add_development_dependency 'bundler'
   spec.add_development_dependency 'rails', ENV['RAILS_VERSION']
+  spec.add_development_dependency 'ransack'
   spec.add_development_dependency 'sqlite3', ENV['SQLITE3_VERSION']
   spec.add_development_dependency 'ffaker'
   spec.add_development_dependency 'rspec', '~> 3.0'

lib/jsonapi/filtering.rb

@@ -1,5 +1,10 @@
-require 'ransack/predicate'
-require_relative 'patches'
+begin
+  require 'active_record'
+  require 'ransack'
+  require_relative 'patches'
+rescue LoadError
+  warn('Install `ransack` gem before using `JSONAPI::Filtering`!')
+end
 
 # Filtering and sorting support
 module JSONAPI