Python + SqlAlchemy 'init' with single table inheritance -


got problems sqlalchemy thing.

i've defined database, relevant parts per below...

class person(base):     __tablename__ = 'person'     #     id = column(integer, primary_key=true)     person_type = column(string(32), nullable=false)     name = column(string(50))     address = column(string(120))     phonenum = column(string(20))     __mapper_args__ = {'polymorphic_on':person_type}  #  class student(person):     __mapper_args__ = {'polymorphic_identity': 'student'}     dob = column(date)

i've other subclasses of 'person' too. i'm having problems way 'init' should look. last attempt was..

for 'person'..

def __init__(self, a_name, a_address, a_phonenum, a_person_type = none):     self.name = a_name     self.address = a_address     self.phonenum = a_phonenum

and 'student'..

def __init__ (self, a_name, a_address,a_phonenum, a_dob=none, a_stud_caregiver_id=none, a_person_type = 'student'):     self.name = a_name     self.address = a_address     self.phonenum = a_phonenum     self.dob = a_dob     self.stud_caregiver_id = a_stud_caregiver_id     self.person_type = a_person_type
  • but though creates database ok, when come 'init' students, i'm getting messages along lines of...

sqlalchemy.exc.invalidrequesterror: 1 or more mappers failed initialize - can't proceed initialization of other mappers. original exception was: class object expected, got 'table('person', metadata(bind=none)....

i've tried with/without person_type parameter .. really, i'm shooting in dark.

i've done dumb, what? thanks!


Comments

Post a Comment

Popular posts from this blog

java.util.scanner - How to read and add only numbers to array from a text file -

i'm learning java , have question regarding reading file want read numbers file contains strings well. here example of file: 66.56 "3 java 3-43 5-42 2.1 1 and here coding: public class test { public static void main (string [] args){ if (0 < args.length) { file x = new file(args[0]); try{ scanner in = new scanner( new fileinputstream(x)); arraylist<double> test = new arraylist<>(); while(in.hasnext()){ if(in.hasnextdouble()){ double f=in.nextdouble(); test.add(f);} else {in.next();} } catch(ioexception e) { system.err.println("exception during reading: " + e); } } my problem add 66.56,2.1 , 1 doesn't add 3 after "3 or ignores 3-43 , 5-42 can tell me how skip strings , add doubles here? thanks all said 3 ie; "3, 3-43 , 4-42 strings either u read string , split , check number @ " , - or put in space between characters , integers. jvm after compilation tre...
Read more

rewrite - Trouble with Wordpress multiple custom querystrings -

i'm working on adding multiple querystring , doesn't seem work. i've found codes seems work others might i'm missing something. i want like: http://mydomain.com/board/?getyear=2013&getsometext2=sometext to http://mydomain.com/board/2013/sometext/ i added code below functions.php file. doesn't seem work should though. this works. echoing querystring gets both variable without problem. http://mydomain.com/board/2013/sometext/ but doesn't. tested querystring vis isset() seems nothing being set/get http://mydomain.com/board/2013/ function add_query_vars($vars) { $vars[] = "getyear"; $vars[] = "getsometext2"; return $vars; } add_filter('query_vars', 'add_query_vars'); function add_rewrite_rules($arules) { $anewrules = array('board/([^/]+)/([^/]+)/?$' => 'index.php?pagename=board&getyear=$matches[1]&getsometext2=$matches[2]'); $arules = $a...
Read more