chore:seed demographics

app/services/dashboard/disaggregation_loader.rb

@@ -0,0 +1,32 @@
+module Dashboard
+  class DisaggregationLoader
+    attr_reader :path
+
+    def initialize(path:)
+      @path = path
+      initialize_directory
+    end
+
+    def load
+      data = {}
+      Dir.glob(Rails.root.join(path, "*.csv")).each do |filepath|
+        puts filepath
+        File.open(filepath) do |file|
+          headers = CSV.parse(file.first).first
+
+          file.lazy.each_slice(1000) do |lines|
+            CSV.parse(lines.join, headers:).map do |row|
+              values = DisaggregationRow.new(row:, headers:)
+              data[[values.lasid, values.district, values.academic_year]] = values
+            end
+          end
+        end
+      end
+      data
+    end
+
+    def initialize_directory
+      FileUtils.mkdir_p(path)
+    end
+  end
+end