I have an error with mysql (about reference): *"1452, u'Cannot add or update a child row"*
The table is created with *db.define_table('navbar', Field("title", "string"), Field("url", "string", requires=IS_EMPTY_OR(IS_URL())), Field("c", label="Controller"), Field("f", label="Function"), Field("args", label="Arguments"), Field("sortable", "integer"), Field("parent_id","reference navbar"), Field('created_on','datetime',default=request.now, label=T('Created On'),writable=False,readable=False), Field('modified_on','datetime',default=request.now, label=T('Modified On'),writable=False,readable=False, update=request.now), Field('registration_key',default='', writable=False,readable=False), Field('reset_password_key',default='', writable=False,readable=False), Field('registration_id',default='', writable=False,readable=False), format='%(title)s', migrate=False)* Any suggestion, please? Thanks in Advance!