Add decrement method to incrementable traits

Author: jeffdill2

README.md

@@ -82,6 +82,9 @@ intercom.users.save(user)
 # Perform incrementing
 user.increment('karma')
 intercom.users.save(user)
+# Perform decrementing
+user.decrement('karma', 5)
+intercom.users.save(user)
 # Iterate over all users
 intercom.users.all.each {|user| puts %Q(#{user.email} - #{user.custom_attributes["average_monthly_spend"]}) }
 intercom.users.all.map {|user| user.email }

lib/intercom/traits/incrementable_attributes.rb

@@ -7,6 +7,12 @@ def increment(key, value=1)
         existing_value ||= 0
         self.custom_attributes[key] = existing_value + value
       end
+
+      def decrement(key, value=1)
+        existing_value = self.custom_attributes[key] || 0
+        self.custom_attributes[key] = existing_value - value
+      end
+
     end
   end
 end

spec/unit/intercom/user_spec.rb

@@ -148,6 +148,34 @@
     end
   end
 
+  describe "decrementing custom_attributes fields" do
+    before :each do
+      @now = Time.now
+      @user = Intercom::User.new("email" => "[email protected]", :user_id => "i-1224242", :custom_attributes => {"mad" => 123, "another" => 432, "other" => @now.to_i, :thing => "yay"})
+    end
+
+    it "decrements down by 1 with no args" do
+      @user.decrement("mad")
+      @user.to_hash["custom_attributes"]["mad"].must_equal 122
+    end
+
+    it "decrements down by given value" do
+      @user.decrement("mad", 3)
+      @user.to_hash["custom_attributes"]["mad"].must_equal 120
+    end
+
+    it "can decrement new custom data fields" do
+      @user.decrement("new_field", 5)
+      @user.to_hash["custom_attributes"]["new_field"].must_equal -5
+    end
+
+    it "can call decrement on the same key twice and decrement by 2" do
+      @user.decrement("mad")
+      @user.decrement("mad")
+      @user.to_hash["custom_attributes"]["mad"].must_equal 121
+    end
+  end
+
   it "fetches a user" do
     client.expects(:get).with("/users", {"email" => "[email protected]"}).returns(test_user)
     user = client.users.find("email" => "[email protected]")