feat: Add 'all school' option to exports page

app/controllers/exports_controller.rb

@@ -25,14 +25,17 @@ class ExportsController < ApplicationController
       format.csv do
         year_params = params.select { |param| param.start_with?("academic_year") }.values
         academic_years = AcademicYear.where(range: year_params)
+        group = params["school_group"]
 
-        if params["school_group"] == "district"
+        if group == "district"
           district_id ||= params[:district]&.to_i if params[:district].present?
           district = District.find(district_id) if district_id.present?
           district ||= District.first
           schools = district.schools
-        else
+        elsif group == "school"
           schools = [School.find_by_name(params["school"])]
+        elsif group == "all"
+          schools = School.all
         end
 
         report = params[:report]

app/views/exports/index.html.erb

@@ -20,6 +20,8 @@
 
                 <h3 class="sub-header-4 mt-5">Grouped By</h3>
                 <div class="mt-3">
+                  <input type="radio" id="all" name="school_group" value="all" <%= @schools_grouped_by == "all" ? "checked" : ""  %>>
+                  <label for="all">All Schools (No Grouping)</label><br>
                   <input type="radio" id="by_district" name="school_group" value="district" <%= @schools_grouped_by == "district" ? "checked" : ""  %>>
                   <label for="by_district">District</label><br>
                   <input type="radio" id="by_school" name="school_group" value="school" <%= @schools_grouped_by == "school" ? "checked" : ""  %>>