Fix configurable pagination

.env.test

@@ -10,6 +10,7 @@ PRIMO_API_URL=https://api-na.hosted.exlibrisgroup.com/primo/v1
 PRIMO_SCOPE=cdi
 PRIMO_TAB=all
 PRIMO_VID=01MIT_INST:MIT
+RESULTS_PER_PAGE=20
 SYNDETICS_PRIMO_URL=https://syndetics.com/index.php?client=primo
 TACOS_HOST=FAKE_TACOS_HOST
 TACOS_URL=http://FAKE_TACOS_HOST/graphql

app/controllers/search_controller.rb

@@ -160,7 +160,7 @@ def fetch_primo_data(offset: nil, per_page: nil)
   def fetch_timdex_data(offset: nil, per_page: nil)
     query = QueryBuilder.new(@enhanced_query).query
     query['from'] = offset.to_s if offset
-    query['size'] = per_page.to_s if per_page
+    query['perPage'] = per_page || ENV.fetch('RESULTS_PER_PAGE', '20').to_i
     query['fulltext'] = true if Feature.enabled?(:timdex_fulltext)
 
     response = query_timdex(query)

test/models/analyzer_test.rb

@@ -318,4 +318,41 @@ class AnalyzerTest < ActiveSupport::TestCase
       assert_equal 100, pagination[:end] # 2 * 50
     end
   end
+
+  test 'analyzer correctly handles configurable results per page' do
+    eq = {
+      q: 'data',
+      page: 1
+    }
+
+    ClimateControl.modify RESULTS_PER_PAGE: '50' do
+      pagination = Analyzer.new(eq, 500, :timdex).pagination
+
+      assert_equal 50, pagination[:per_page]
+      assert_equal 1, pagination[:start]
+      assert_equal 50, pagination[:end]
+      assert_equal 2, pagination[:next]
+      refute pagination.key?(:prev)
+    end
+  end
+
+  test 'analyzer correctly handles configurable results per page for all tab' do
+    eq = {
+      q: 'data',
+      page: 1
+    }
+
+    ClimateControl.modify RESULTS_PER_PAGE: '50' do
+      pagination = Analyzer.new(eq, 500, :all, 300).pagination
+
+      # Combined hits: 300 + 500 = 800
+      # Page 1 with 50 per page: 1-50 of 800
+      assert_equal 50, pagination[:per_page]
+      assert_equal 800, pagination[:hits]
+      assert_equal 1, pagination[:start]
+      assert_equal 50, pagination[:end]
+      assert_equal 2, pagination[:next]
+      refute pagination.key?(:prev)
+    end
+  end
 end