feat(class): add class admin

- add user class association
- add role color on profile picture

Closes #103
Closes #190

db/migrations/v1_init.sql

@@ -228,4 +228,17 @@ FROM quiz_session_view qsv
          JOIN session_response_view srv ON qsv.session_uuid = srv.session_uuid
          JOIN quiz_question qq ON srv.question_sha1 = qq.sha1
          JOIN quiz_answer qa ON srv.answer_sha1 = qa.sha1
-ORDER BY qq.position
+ORDER BY qq.position;
+
+CREATE VIEW user_class_view
+AS
+SELECT u.id,
+       u.login,
+       u.name,
+       u.picture,
+       u.active,
+       u.role_id,
+       CASE WHEN u.class_uuid IS NULL THEN '' ELSE u.class_uuid END AS class_uuid,
+       CASE WHEN sc.name IS NULL THEN '' ELSE sc.name END           AS class_name
+FROM user u
+         LEFT JOIN student_class sc ON u.class_uuid = sc.uuid

db/queries/user.sql

@@ -1,17 +1,17 @@
 -- name: FindActiveUserById :one
 SELECT *
-FROM user
+FROM user_class_view
 WHERE id = ?
   AND active = 1;
 
 -- name: FindUserById :one
 SELECT *
-FROM user
+FROM user_class_view
 WHERE id = ?;
 
 -- name: FindAllUser :many
 SELECT *
-FROM user;
+FROM user_class_view;
 
 -- name: CreateOrReplaceUser :exec
 REPLACE INTO user (id, login, name, picture, role_id)
@@ -26,3 +26,13 @@ WHERE id = ?;
 UPDATE user
 SET active = ?
 WHERE id = ?;
+
+-- name: UpdateUserClass :exec
+UPDATE user
+SET class_uuid = ?
+WHERE id = ?;
+
+-- name: ClearClassUsers :exec
+UPDATE user
+SET class_uuid = NULL
+WHERE class_uuid = ?;