Try to fix circular dependency

app/models/carto/rate_limit_value.rb

@@ -0,0 +1,25 @@
+module Carto
+  class RateLimitValue
+
+    attr_accessor :max_burst, :count_per_period, :period
+
+    def initialize(values)
+      @values = values
+      self.max_burst, self.count_per_period, self.period = values.map(&:to_i) if valid?
+    end
+
+    def valid?
+      values_per_rate_limit = Carto::RateLimitValues::VALUES_PER_RATE_LIMIT
+      if !@values || @values.length < values_per_rate_limit && @values.length % values_per_rate_limit != 0
+        raise 'Error: Number of rate limits needs to be multiple of three'
+      end
+
+      true
+    end
+
+    def to_array
+      [max_burst, count_per_period, period]
+    end
+
+  end
+end

app/models/carto/rate_limit_values.rb

@@ -1,5 +1,6 @@
 module Carto
   class RateLimitValues
+
     extend Forwardable
     delegate [:<<,
               :[],
@@ -23,7 +24,7 @@ module Carto
       values = convert_from_db_array(values)
 
       values.each_slice(VALUES_PER_RATE_LIMIT) do |slice|
-        push(RateLimitValue.new(slice))
+        push(Carto::RateLimitValue.new(slice))
       end
     end
 
@@ -36,7 +37,7 @@ module Carto
     end
 
     def to_redis_array
-      RateLimitValues.dump(self)
+      self.class.dump(self)
     end
 
     def self.dump(rate_limit_values)
@@ -46,36 +47,17 @@ module Carto
     end
 
     def self.load(values)
-      RateLimitValues.new(values)
+      new(values)
     end
 
     private
 
     def convert_from_db_array(values)
-      return [] if values.nil? || values.empty?
+      return [] if values.blank?
       return values.delete('{}').split(',') if values.is_a? String
-      values
-    end
-  end
-
-  class RateLimitValue
-    attr_accessor :max_burst, :count_per_period, :period
-
-    def initialize(values)
-      @values = values
-      self.max_burst, self.count_per_period, self.period = values.map(&:to_i) if valid?
-    end
 
-    def valid?
-      values_per_rate_limit = Carto::RateLimitValues::VALUES_PER_RATE_LIMIT
-      if !@values || @values.length < values_per_rate_limit && @values.length % values_per_rate_limit != 0
-        raise 'Error: Number of rate limits needs to be multiple of three'
-      end
-      true
+      values
     end
 
-    def to_array
-      [max_burst, count_per_period, period]
-    end
   end
 end