Added a format filter to Exercises search

app/routines/search_exercises.rb

@@ -251,6 +251,19 @@ def exec(params = {}, options = {})
         end
       end
 
+      with.keyword :format do |formats|
+        formats.each do |format|
+          sanitized_formats = to_string_array(format).map(&:downcase)
+          next @items = @items.none if sanitized_formats.empty?
+
+          @items = @items.where(
+            Question.joins(stems: :stylings).where(
+              '"questions"."exercise_id" = "exercises"."id"'
+            ).where(stems: { stylings: { style: sanitized_formats } }).arel.exists
+          )
+        end
+      end
+
       with.keyword :solutions_are_public do |saps|
         saps.each do |sap|
           sanitized_saps = to_string_array(sap).map do |str|

spec/routines/search_exercises_spec.rb

@@ -58,7 +58,7 @@
         'answers' => [{
           'content_html' => "Sed quia non numquam"
         }],
-        'formats' => [ 'multiple-choice', 'free-response' ]
+        'formats' => [ 'true-false' ]
       }],
       'solutions_are_public' => false
     )
@@ -217,6 +217,15 @@
       expect(outputs.items).to eq [@exercise_1]
     end
 
+    it "returns an Exercise matching a format" do
+      result = described_class.call q: "format:multiple-choice"
+      expect(result.errors).to be_empty
+
+      outputs = result.outputs
+      expect(outputs.total_count).to eq 1
+      expect(outputs.items).to eq [@exercise_1]
+    end
+
     it "returns an Exercise matching solutions_are_public" do
       result = described_class.call q: "solutions_are_public:true"
       expect(result.errors).to be_empty
@@ -335,6 +344,24 @@
       expect(outputs.items).to eq [@exercise_1]
     end
 
+    it "returns Exercises matching any of a list of formats" do
+      result = described_class.call q: "format:multiple-choice,true-false"
+      expect(result.errors).to be_empty
+
+      outputs = result.outputs
+      expect(outputs.total_count).to eq 2
+      expect(outputs.items).to eq [@exercise_1, @exercise_2]
+    end
+
+    it "returns an Exercise matching all of a list of formats" do
+      result = described_class.call q: "format:multiple-choice format:free-response"
+      expect(result.errors).to be_empty
+
+      outputs = result.outputs
+      expect(outputs.total_count).to eq 1
+      expect(outputs.items).to eq [@exercise_1]
+    end
+
     it "sorts by multiple fields in different directions" do
       result = described_class.call(q: 'content:aDiPiScI', order_by: "number DESC, version ASC")
       expect(result.errors).to be_empty