Startouf · October 25, 2018 20:58 · Oct 25, 2018
diff --git a/in_memory_iterable_adapter.rb b/in_memory_iterable_adapter.rb
@@ -0,0 +1,57 @@
+module Jsonapi
+  module Adapters
+    # Adapter for resources already loaded in memory
+    # 
+    # The scope is meant to be something like an Array or Iterable of objects
+    # 
+    # @example Time Series
+    # 
+    # scope = [
+    #   OpenStruct.new(at: Time.now.noon, name: 'I ate'),
+    #   OpenStruct.new(at: Time.now.midnight, name: 'I went to sleep')
+    # ]
+    # 
+    # Sorting by time 
+    #   scope.sort_by(&:at)
+    # Filtering by event name
+    #   scope.select { |i| i.name == 'I ate' }
+    #
+    # @author [Cyril]
+    #
+    class InMemoryIterableAdapter < TransactionlessMongoidAdapter
+      # @override
+      def resolve(scope)
+        scope
+      end
+
+      # @override for array sort
+      def filter(scope, attribute, value)
+        scope.select do |item|
+          item.send(attribute) == value
+        end
+      end
+
+      # @Override
+      def order(scope, attribute, direction)
+        # return scope if attribute == :id # Seems broken
+        if direction == :asc
+          scope.sort_by { |i| i.public_send(attribute) }
+        elsif direction == :desc
+          scope.sort_by { |i| i.public_send(attribute) }.reverse
+        end
+      end
+
+      # @Override
+      def paginate(scope, current_page, per_page)
+        pg_start = (current_page - 1) * per_page
+        pg_eng = (current_page) * per_page - 1
+        scope[pg_start..pg_eng]
+      end
+
+      # @Override
+      def count(scope, _attr)
+        scope.size
+      end
+    end
+  end
+end