#7 Disable empty First- and Last Names as well as empty Passwords on Sign-Up

backend/sql/02_create-user_tables.sql

@@ -2,8 +2,8 @@
 create table candymat_data.person
 (
     id         serial primary key,
-    first_name character varying(200),
-    last_name  character varying(200),
+    first_name character varying(200) check (first_name <> ''),
+    last_name  character varying(200) check (last_name <> ''),
     about      character varying(2000),
     created_at timestamp default now(),
     role candymat_data.role not null default 'candymat_person'

backend/sql/04_setup_authentication.sql

@@ -16,13 +16,23 @@ grant execute on function candymat_data.current_person() to candymat_person;
 
 create function candymat_data.register_person(
     first_name text,
-    last_name text,
-    email text,
-    password text
-) returns candymat_data.person as $$
+    last_name  text,
+    email      text,
+    password   text
+) returns candymat_data.person as
+$$
 declare
     person candymat_data.person;
 begin
+    if (trim(register_person.first_name) <> '') is not true then
+        raise 'Invalid first name: ''%''', register_person.first_name;
+    end if;
+    if (trim(register_person.last_name) <> '') is not true then
+        raise 'Invalid last name: ''%''', register_person.last_name;
+    end if;
+    if (trim(register_person.password) <> '') is not true then
+        raise 'Invalid password.';
+    end if;
     insert into candymat_data.person (first_name, last_name)
     values ($1, $2)
     returning * into person;
@@ -31,8 +41,10 @@ begin
     values (person.id, $3, crypt($4, gen_salt('bf')));
 
     return person;
-end;
-$$ language plpgsql strict security definer;
+end ;
+$$ language plpgsql strict
+                    security definer;
+
 grant execute on function candymat_data.register_person(text, text, text, text) to candymat_anonymous;
 
 create function candymat_data.authenticate(