add questionFilterOptions query

app/graphql/resolvers/question_filter_options_query_resolver.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+module Resolvers
+    class QuestionFilterOptionsQueryResolver
+      def initialize; end
+
+      def resolve
+        {
+          years: Question.distinct(:authorship_year).pluck(:authorship_year)
+        }
+      end
+    end
+  end

app/graphql/types/query_type.rb

@@ -8,6 +8,7 @@ module Types
     end
     field :subjects, SubjectType.connection_type, null: false
     field :reviewers, UserType.connection_type, null: false
+    field :question_filter_options, QuestionFilterOptionsType, null: false
     field :current_user, Types::UserType, null: true
 
     def questions(where: nil)
@@ -22,6 +23,11 @@ module Types
       Resolvers::ReviewersQueryResolver.new(context).resolve
     end
 
+
+    def question_filter_options
+      Resolvers::QuestionFilterOptionsQueryResolver.new.resolve
+    end
+
     def current_user
       context[:current_user]
     end

app/graphql/types/question_filter_options_type.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+module Types
+    class QuestionFilterOptionsType < Types::BaseObject
+      field :years, [String], null: false
+    end
+  end

app/javascript/__generated__/graphql-schema.ts

@@ -163,6 +163,7 @@ export type Query = {
   node?: Maybe<Node>;
   /** Fetches a list of objects given a list of IDs. */
   nodes: Array<Maybe<Node>>;
+  questionFilterOptions: QuestionFilterOptions;
   questions: QuestionConnection;
   reviewers: UserConnection;
   subjects: SubjectConnection;
@@ -313,6 +314,11 @@ export type QuestionEdge = {
   node?: Maybe<Question>;
 };
 
+export type QuestionFilterOptions = {
+  __typename?: 'QuestionFilterOptions';
+  years: Array<Scalars['String']>;
+};
+
 export enum QuestionStatus {
   Approved = 'APPROVED',
   Draft = 'DRAFT',

app/javascript/__generated__/schema.graphql

@@ -223,6 +223,7 @@ type Query {
     """
     ids: [ID!]!
   ): [Node]!
+  questionFilterOptions: QuestionFilterOptions!
   questions(
     """
     Returns the elements in the list that come after the specified cursor.
@@ -424,6 +425,10 @@ type QuestionEdge {
   node: Question
 }
 
+type QuestionFilterOptions {
+  years: [String!]!
+}
+
 enum QuestionStatus {
   APPROVED
   DRAFT