From 3df134e08e798d077155e24005138d4b6d1bdfd5 Mon Sep 17 00:00:00 2001
From: Andrew Vit <andrew@avit.ca>
Date: Sat, 2 Jan 2016 10:49:13 -0800
Subject: [PATCH] Tell if a condition is negative

---
 lib/ransack/nodes/condition.rb       | 4 ++++
 lib/ransack/predicate.rb             | 4 ++++
 spec/ransack/nodes/condition_spec.rb | 9 +++++++++
 3 files changed, 17 insertions(+)

diff --git a/lib/ransack/nodes/condition.rb b/lib/ransack/nodes/condition.rb
index ab09ecf..1fe3f28 100644
--- a/lib/ransack/nodes/condition.rb
+++ b/lib/ransack/nodes/condition.rb
@@ -247,6 +247,10 @@ module Ransack
         "Condition <#{data}>"
       end
 
+      def negative?
+        predicate.negative?
+      end
+
       private
 
       def valid_combinator?
diff --git a/lib/ransack/predicate.rb b/lib/ransack/predicate.rb
index 2b5bd5d..9357294 100644
--- a/lib/ransack/predicate.rb
+++ b/lib/ransack/predicate.rb
@@ -74,5 +74,9 @@ module Ransack
       vals.any? { |v| validator.call(type ? v.cast(type) : v.value) }
     end
 
+    def negative?
+      @name.include?("not_".freeze)
+    end
+
   end
 end
diff --git a/spec/ransack/nodes/condition_spec.rb b/spec/ransack/nodes/condition_spec.rb
index 6cb728d..8520fd8 100644
--- a/spec/ransack/nodes/condition_spec.rb
+++ b/spec/ransack/nodes/condition_spec.rb
@@ -29,6 +29,15 @@ module Ransack
         specify { expect(subject.values.size).to eq(2) }
       end
 
+      describe '#negative?' do
+        let(:context) { Context.for(Person) }
+        let(:eq)      { Condition.extract(context, 'name_eq', 'A') }
+        let(:not_eq)  { Condition.extract(context, 'name_not_eq', 'A') }
+
+        specify { expect(not_eq.negative?).to be true }
+        specify { expect(eq.negative?).to be false }
+      end
+
       context 'with an invalid predicate' do
         subject {
           Condition.extract(