add api implementation

app/controllers/dashboard_controller.rb

@@ -0,0 +1,92 @@
+class DashboardController < ApplicationController
+  require 'httparty'
+  require 'csv'
+  require 'prawn'
+
+  def index
+    @filters = fetch_filter_options
+
+    if params[:org_type]
+      @selected = {
+        org_type: params[:org_type],
+        sy: params[:sy],
+        grad_rate_type: params[:grad_rate_type],
+        stu_grp: params[:stu_grp]
+      }
+      @data = fetch_filtered_data(@selected)
+    else
+      @selected = {}
+      @data = []
+    end
+  end
+
+  def download_csv
+    data = fetch_filtered_data(params)
+    csv_string = CSV.generate(headers: true) do |csv|
+      csv << data.first.keys if data.any?
+      data.each { |row| csv << row.values }
+    end
+    send_data csv_string, filename: "graduation_stats.csv"
+  end
+
+  def download_pdf
+    data = fetch_filtered_data(params)
+    pdf = Prawn::Document.new
+    pdf.text "Graduation Stats Report", size: 14, align: :center
+    pdf.move_down 10
+    data.each_with_index do |row, i|
+      pdf.text "#{i+1}. #{row.values.join(", ")}"
+    end
+    send_data pdf.render, filename: "graduation_stats.pdf", type: "application/pdf"
+  end
+
+  private
+
+  def fetch_filter_options
+    response = HTTParty.get("https://educationtocareer.data.mass.gov/resource/n2xa-p822.json?$limit=1000", headers: headers)
+    df = response.parsed_response
+    {
+      org_types: df.map { |x| x["org_type"] }.compact.uniq.sort,
+      school_years: df.map { |x| x["sy"] }.compact.uniq.sort.reverse,
+      rate_types: df.map { |x| x["grad_rate_type"] }.compact.uniq.sort,
+      student_groups: df.map { |x| x["stu_grp"] }.compact.uniq.sort
+    }
+  end
+
+  def fetch_filtered_data(filters)
+    where_clause = URI.encode_www_form_component("org_type='#{filters[:org_type]}' AND sy='#{filters[:sy]}' AND grad_rate_type='#{filters[:grad_rate_type]}' AND stu_grp='#{filters[:stu_grp]}'")
+    url = "https://educationtocareer.data.mass.gov/resource/n2xa-p822.json?$where=#{where_clause}&$limit=50000"
+    response = HTTParty.get(url, headers: headers)
+    df = response.parsed_response
+
+    numeric_cols = %w[cohort_cnt grad_pct in_sch_pct non_grad_pct ged_pct drpout_pct exclud_pct]
+    df.each do |row|
+      numeric_cols.each { |col| row[col] = row[col].to_f if row[col] }
+    end
+
+    name_col, code_col = case filters[:org_type]
+                         when "District" then ["dist_name", "dist_code"]
+                         when "School" then ["org_name", "org_code"]
+                         else ["org_name", "org_code"]
+                         end
+
+    df.map.with_index(1) do |row, idx|
+      {
+        "S. No." => idx,
+        name_col => row[name_col],
+        code_col => row[code_col],
+        "# in Cohort" => row["cohort_cnt"],
+        "% Graduated" => row["grad_pct"],
+        "% Still in School" => row["in_sch_pct"],
+        "% Non-Grad Completers" => row["non_grad_pct"],
+        "% H.S. Equiv." => row["ged_pct"],
+        "% Dropped Out" => row["drpout_pct"],
+        "% Permanently Excluded" => row["exclud_pct"]
+      }
+    end
+  end
+
+  def headers
+    { "X-App-Token" => ENV["SOCRATA_APP_TOKEN"] }
+  end
+end