Better auth errors under certain circumstances

app/controllers/api/abstract_controller.rb

@@ -35,8 +35,7 @@ private
     def authenticate_user!
       # All possible information that could be needed for any of the 3 auth
       # strategies.
-      context = { 
-                  jwt:           request.headers["Authorization"],
+      context = { jwt:           request.headers["Authorization"],
                   user:          current_user }
       # Returns a symbol representing the appropriate auth strategy, or nil if
       # unknown.

app/mutations/auth/from_jwt.rb

@@ -8,7 +8,7 @@ module Auth
       token  = SessionToken.decode!(just_the_token)
       claims = token.unencoded
       email  = claims['sub']
-      User.find_by(email: email)
+      User.find_by!(email: email)
     rescue JWT::DecodeError
       add_error :jwt, :decode_error, "JSON Web Token is not valid."
     end