Adding role to users (#12)

A user is defined by it's role and should be defined in it's setter and
getter

Closes #8

Co-authored-by: Anthony Debucquoy <debucquoy.anthony@gmail.com>
Co-authored-by: Debucquoy <debucqquoy.anthony@gmail.com>
Reviewed-on: #12
Reviewed-by: Wal <karpinskiwal@gmail.com>

Documents/proto/general/openapi.yaml

@@ -44,8 +44,7 @@ paths:
           name: type
           required: false 
           schema:
-            type: string
-            enum: [teacher, student, secretary]
+            $ref: '#components/schemas/Roles'
       responses: 
         '200':
           description: OK
@@ -98,6 +97,8 @@ paths:
                 BirthDate:
                   type: string
                   description: Follow the iso 8601 ("YYYY-MM-DD")
+                Role:
+                  $ref: "#/components/schemas/Roles"
               example:
                 {
                 "LastName": "Doe" ,
@@ -107,6 +108,7 @@ paths:
                   "Address": "Rue de Tournais 42",
                   "Country": "BE"},
                 "BirthDate": "1941-02-22",
+                "Role": "student"
                 }
       responses:
         '201':
@@ -253,7 +255,8 @@ paths:
                 faculty:
                   type: string
                 teachers:
-                  $ref: '#/components/schemas/User'
+                  type: integer
+                  description: Teacher's identifier
                 assistants:
                   type: array
                   items:
@@ -809,6 +812,8 @@ components:
         birthDate:
           type: string
           description: Follow the iso 8601 ("YYYY-MM-DD")
+        role:
+          $ref: '#/components/schemas/Roles'
       example:
         {
         "regNo": 42,
@@ -819,7 +824,7 @@ components:
           "address": "Rue de Tournais 42",
           "country": "BE"},
         "birthDate": "1941-02-22",
-        "staffMember": true,
+        "role": "student"
         }
     Address:
       type: object
@@ -878,6 +883,9 @@ components:
         "id": 42,
         "courses": ['Math', 'Info']
         }
+    Roles:
+      type: string
+      enum: [teacher, student, secretary]
     Article:
       type: object
       properties: