Add arguments for assignment input object

closes VICE-3798
flag=discussion_create

Test Plan:
- create an assignment via graphiql
 - with gradingStandardId

- create a discussion topic
 - with assignment

NOTE:
the assignment field will always return null
because the actual assignment creation will
be done in VICE-3799

Sample for discussion topic with assignment:
mutation MyMutation {
  __typename
  createDiscussionTopic(input: {contextId: "1",
    contextType: "Course",
    assignment: {
      name: "GQL Test Assignment Create 1",
      courseId: "1",
      pointsPossible: 15
    },
    title: "GQL Test Assignment Create 1"
  }) {
    discussionTopic {
      _id
      title
      assignment {
        _id
      }
    }
  }
}

Change-Id: Ib86f69307d6d2c91888cc88aab6d48d1fc163c44
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/330480
Reviewed-by: Jason Gillett <jason.gillett@instructure.com>
Product-Review: Jason Gillett <jason.gillett@instructure.com>
QA-Review: Caleb Guanzon <cguanzon@instructure.com>
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>

app/graphql/mutations/assignment_base.rb

@@ -47,6 +47,20 @@ class Mutations::AssignmentPeerReviewsUpdate < GraphQL::Schema::InputObject
   argument :automatic_reviews, Boolean, required: false
 end
 
+class Mutations::AssignmentCreateOrUpdate < GraphQL::Schema::InputObject
+  argument :assignment_group_id, ID, required: false
+  argument :assignment_overrides, [Mutations::AssignmentOverrideCreateOrUpdate], required: false
+  argument :course_id, ID, required: true
+  argument :due_at, Types::DateTimeType, required: false
+  argument :grading_type, Types::AssignmentType::AssignmentGradingType, required: false
+  argument :grading_standard_id, ID, required: false
+  argument :lock_at, Types::DateTimeType, required: false
+  argument :name, String, required: true
+  argument :peer_reviews, Mutations::AssignmentPeerReviewsUpdate, required: false
+  argument :points_possible, Float, required: false
+  argument :unlock_at, Types::DateTimeType, required: false
+end
+
 class Mutations::AssignmentBase < Mutations::BaseMutation
   # we are required to wrap the update method with a proxy class because
   # we are required to include `Api` for instance methods within the module.
@@ -109,6 +123,7 @@ class Mutations::AssignmentBase < Mutations::BaseMutation
   argument :allowed_attempts, Int, required: false
   argument :only_visible_to_overrides, Boolean, required: false
   argument :submission_types, [Types::AssignmentSubmissionType], required: false
+  argument :grading_standard_id, ID, required: false
   argument :peer_reviews, Mutations::AssignmentPeerReviewsUpdate, required: false
   argument :moderated_grading, Mutations::AssignmentModeratedGradingUpdate, required: false
   argument :grade_group_students_individually, Boolean, required: false

app/graphql/mutations/discussion_base.rb

@@ -20,6 +20,7 @@
 
 class Mutations::DiscussionBase < Mutations::BaseMutation
   argument :allow_rating, Boolean, required: false
+  argument :assignment, Mutations::AssignmentCreateOrUpdate, required: false
   argument :delayed_post_at, Types::DateTimeType, required: false
   argument :group_category_id, ID, required: false
   argument :lock_at, Types::DateTimeType, required: false

spec/apis/v1/discussion_topics_api_spec.rb

@@ -609,7 +609,6 @@ describe DiscussionTopicsController, type: :request do
                      exclude_small_matches_value: 0,
                      submit_papers_to: true
                    },
-                   publishable: true,
                    hidden: false,
                    unpublishable: true,
                    only_visible_to_overrides: false,

spec/graphql/mutations/create_assignment_spec.rb

@@ -304,6 +304,44 @@ describe Mutations::CreateAssignment do
     expect(section_override.due_at).to eq due3
   end
 
+  it "sets lock_at_overridden" do
+    due1 = 1.day.from_now.round.change(min: 1)
+
+    result = execute_with_input <<~GQL
+      name: "assignment with overrides"
+      courseId: "#{@course.to_param}"
+      onlyVisibleToOverrides: true
+      assignmentOverrides: [
+        {
+          studentIds: [#{@student.to_param}]
+          dueAt: "#{due1.iso8601}"
+          lockAt: "#{due1.iso8601}"
+          unlockAt: "#{due1.iso8601}"
+        }
+      ]
+    GQL
+
+    assignment = Assignment.find(result.dig("data", "createAssignment", "assignment", "_id"))
+    expect(assignment).to be_only_visible_to_overrides
+
+    student_override = assignment.assignment_overrides.where(set_type: "ADHOC").first
+    expect(student_override.due_at_overridden).to be true
+    expect(student_override.lock_at_overridden).to be true
+    expect(student_override.unlock_at_overridden).to be true
+  end
+
+  it "sets grade_standard_id" do
+    @standard = @course.account.grading_standards.create!(title: "account standard", standard_data: { a: { name: "A", value: "95" }, b: { name: "B", value: "80" }, f: { name: "F", value: "" } })
+    result = execute_with_input <<~GQL
+      name: "assignment with overrides"
+      courseId: "#{@course.to_param}"
+      gradingStandardId: "#{@standard.id}"
+    GQL
+
+    assignment = Assignment.find(result.dig("data", "createAssignment", "assignment", "_id"))
+    expect(assignment.grading_standard_id).to eq @standard.id
+  end
+
   it "requires a name" do
     result = execute_with_input <<~GQL
       courseId: "#{@course.to_param}"