Delete a Confg Key by assigning nil

README.md

@@ -69,6 +69,9 @@ User.async_fetch_content(user.id)
 
     ... # done fetching content
     Howler::Config[user_id] = {:fetched_at => Time.now, :status => 'success'}.to_json
+
+    # Then to delete a key simply assign nil
+    Howler::Config[user_id] = nil
   end
 ```
 

lib/howler/support/config.rb

@@ -7,8 +7,12 @@ def self.[](key)
     end
 
     def self.[]=(key, value)
+      if value.nil?
+        delete(key)
+        return
+      end
+
       Howler.redis.with {|redis| redis.hset("howler:config", key.to_s, value) }
-      value
     end
 
     def self.flush
@@ -19,5 +23,11 @@ def self.flush
         end
       end
     end
+
+    private
+
+    def self.delete(key)
+      Howler.redis.with {|redis| redis.hdel("howler:config", key.to_s) }
+    end
   end
 end

spec/models/support/config_spec.rb

@@ -23,6 +23,16 @@
     it "should configure options" do
       Howler.redis.with {|redis| redis.hget("howler:config", "message") }.should == '{"key": 3}'
     end
+
+    describe "when the value is nil" do
+      it "should remove the key" do
+        Howler.redis.with {|redis| redis.hexists("howler:config", "message") }.should == true
+
+        Howler::Config[:message] = nil
+
+        Howler.redis.with {|redis| redis.hexists("howler:config", "message") }.should == false
+      end
+    end
   end
 
   describe ".flush" do