Question

I am trying to update a datastore by uploading a formatted file(contains multiple lines). Each line in the file will create a new record in google app engine datastore. I am not sure how to add multiple rows to the datastore within a for loop. I tried:

class Records(db.Model): 
      something = db.StringProperty()

.....

for line in lines   #lines is a file contains multiple lines
  record = Records(parent = PARENT_KEY)  
  record.something = line
  record.put()

It doesn’t work and the error message is BadValueError: Property something is not multi-line. I am guessing it’s because the ‘record’ variable refer to the same instance across each iteration.

Sorry if it’s a stupid question. I am pretty new to python and google app engine. Thanks in advance for your input!

Answer 1

for line in lines will keep the newline characters at the end of the lines; newlines aren’t allowed in a StringProperty unless it’s designated as multiline.

try record.something = line.rstrip() to remove the newlines.