A variable is a record that an exercise service can save for a specific user that will be available in all the exercises that use the same exercise service in the future. An exercise service could use this for example to remember some data that user has inputted later on – for example it could remember the user’s name or it could remember a link to a picture that the user has uploaded.
| Name | Type | Default | Nullable | Children | Parents | Comment |
|---|---|---|---|---|---|---|
| course_instance_id | uuid | true | public.course_instances | The course instance the variable is scoped to. Each variable is only visible in the current course instance to prevent other courses or other course instances from interfering with each other. Either course_instance_id or exam_id must be set. | ||
| created_at | timestamp with time zone | now() | false | Timestamp when the record was created. | ||
| deleted_at | timestamp with time zone | true | Timestamp when the record was deleted. If null, the record is not deleted. | |||
| exam_id | uuid | true | public.exams | The variable can be alternatively scoped to an exam instead of the exercise service. Either course_instance_id or exam_id must be set. | ||
| exercise_service_slug | varchar(255) | false | Identifier for the exercise service type that stored this variable. The same identifier needs to exist in exercise_services.slug for the variable to work. | |||
| id | uuid | uuid_generate_v4() | false | A unique, stable identifier for the record. | ||
| updated_at | timestamp with time zone | now() | false | Timestamp when the record was last updated. The field is updated automatically by the set_timestamp trigger. | ||
| user_id | uuid | false | public.users | The user the variable was created for. | ||
| variable_key | varchar(255) | false | Key used to set or to access the variable. | |||
| variable_value | jsonb | false | The thing being stored. |
| Name | Type | Definition |
|---|---|---|
| no_duplicate_keys_instance | UNIQUE | UNIQUE NULLS NOT DISTINCT (variable_key, user_id, course_instance_id, exercise_service_slug, exam_id, deleted_at) |
| user_course_instance_exercise_service_v_course_instance_id_fkey | FOREIGN KEY | FOREIGN KEY (course_instance_id) REFERENCES course_instances(id) |
| user_course_instance_exercise_service_variables_check | CHECK | CHECK (((course_instance_id IS NULL) <> (exam_id IS NULL))) |
| user_course_instance_exercise_service_variables_exam_id_fkey | FOREIGN KEY | FOREIGN KEY (exam_id) REFERENCES exams(id) |
| user_course_instance_exercise_service_variables_pkey | PRIMARY KEY | PRIMARY KEY (id) |
| user_course_instance_exercise_service_variables_user_id_fkey | FOREIGN KEY | FOREIGN KEY (user_id) REFERENCES users(id) |
| Name | Definition |
|---|---|
| no_duplicate_keys_instance | CREATE UNIQUE INDEX no_duplicate_keys_instance ON public.user_course_instance_exercise_service_variables USING btree (variable_key, user_id, course_instance_id, exercise_service_slug, exam_id, deleted_at) NULLS NOT DISTINCT |
| user_course_instance_exercise_service_variables_pkey | CREATE UNIQUE INDEX user_course_instance_exercise_service_variables_pkey ON public.user_course_instance_exercise_service_variables USING btree (id) |
| Name | Definition |
|---|---|
| set_timestamp | CREATE TRIGGER set_timestamp BEFORE UPDATE ON public.user_course_instance_exercise_service_variables FOR EACH ROW EXECUTE FUNCTION trigger_set_timestamp() |
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