chore:seed demographics

app/services/dashboard/staffing_loader.rb

@@ -0,0 +1,74 @@
+# frozen_string_literal: true
+
+require "csv"
+
+module Dashboard
+  class StaffingLoader
+    def self.load_data(filepath:)
+      schools = []
+      respondents = []
+      CSV.parse(File.read(filepath), headers: true) do |row|
+        row = StaffingRowValues.new(row:)
+        next unless row.school.present? && row.academic_year.present?
+
+        schools << row.school
+
+        respondents << create_staffing_entry(row:)
+      end
+
+      Respondent.import respondents, batch_size: 1000, on_duplicate_key_update: [:total_teachers]
+      Respondent.where.not(school: schools).destroy_all
+    end
+
+    def self.clone_previous_year_data
+      years = AcademicYear.order(:range).last(2)
+      previous_year = years.first
+      current_year = years.last
+      respondents = []
+      School.all.each do |school|
+        Respondent.where(school:, academic_year: previous_year).each do |respondent|
+          current_respondent = Respondent.find_or_initialize_by(school:, academic_year: current_year)
+          current_respondent.total_teachers = respondent.total_teachers
+          respondents << current_respondent
+        end
+      end
+      Respondent.import respondents, batch_size: 1000, on_duplicate_key_update: [:total_teachers]
+    end
+
+    private
+
+    def self.create_staffing_entry(row:)
+      respondent = Respondent.find_or_initialize_by(school: row.school, academic_year: row.academic_year)
+      respondent.total_teachers = row.fte_count
+      respondent
+    end
+
+    private_class_method :create_staffing_entry
+  end
+
+  class StaffingRowValues
+    attr_reader :row
+
+    def initialize(row:)
+      @row = row
+    end
+
+    def school
+      @school ||= begin
+        dese_id = row["DESE ID"].strip.to_i
+        School.find_by_dese_id(dese_id)
+      end
+    end
+
+    def academic_year
+      @academic_year ||= begin
+        year = row["Academic Year"]
+        AcademicYear.find_by_range(year)
+      end
+    end
+
+    def fte_count
+      row["FTE Count"]
+    end
+  end
+end