inspect on Ransack::Search objects now will not load entire object graph

This means that:

1) inspect calls will be faster
2) inspect calls will be easier to understand
3) queries won't be executed until #result is called on the Search object

Fixes #115 with #121

lib/ransack/nodes/attribute.rb

@@ -44,6 +44,10 @@ def persisted?
         false
       end
 
+      def inspect
+        "Attribute <#{name}>"
+      end
+
     end
   end
 end

lib/ransack/nodes/condition.rb

@@ -200,6 +200,13 @@ def default_type
         predicate.type || (attributes.first && attributes.first.type)
       end
 
+      def inspect
+        data =[['attributes', a.try(:map, &:name)], ['predicate', p], ['combinator', m], ['values', v.try(:map, &:value)]].reject { |e|
+          e[1].blank?
+        }.map { |v| "#{v[0]}: #{v[1]}" }.join(', ')
+        "Condition <#{data}>"
+      end
+
       private
 
       def valid_combinator?

lib/ransack/nodes/grouping.rb

@@ -154,6 +154,13 @@ def build(params)
         self
       end
 
+      def inspect
+        data =[['conditions', conditions], ['combinator', combinator]].reject { |e|
+          e[1].blank?
+        }.map { |v| "#{v[0]}: #{v[1]}" }.join(', ')
+        "Grouping <#{data}>"
+      end
+
       private
 
       def write_attribute(name, val)

lib/ransack/nodes/value.rb

@@ -98,6 +98,10 @@ def cast_to_decimal(val)
          end
        end
 
+      def inspect
+        "Value <#{value}>"
+      end
+
        def array_of_arrays?(val)
          Array === val && Array === val.first
        end

lib/ransack/search.rb

@@ -90,6 +90,10 @@ def method_missing(method_id, *args)
       end
     end
 
+    def inspect
+      "Ransack::Search<class: #{klass.name}, base: #{base.inspect}>"
+    end
+
     private
 
     def collapse_multiparameter_attributes!(attrs)

spec/ransack/search_spec.rb

@@ -104,6 +104,11 @@ module Ransack
         condition.attributes.first.name.should eq 'name'
         condition.value.should eq ['Ernie', 'Bert']
       end
+
+      it 'does not evaluate the query on #inspect' do
+        search = Search.new(Person, :children_id_in => [1, 2, 3])
+        search.inspect.should_not match /ActiveRecord/
+      end
     end
 
     describe '#result' do