[migration] hackish black magic to bootstrap addition of formula attr during migration
Turns out we can't add an attribute to CWAttribute before the attribute
exists. add_attribute generates rql with a 'formula' relation, which CW
doesn't know about yet, so things get unhappy. Once that is fixed, we
need to make the CWAttribute addition operation deal with CWAttribute
entities that don't have a formula yet.
Finally, move the migration to bootstrapmigration_repository so it
happens early on, and use add_entity_type rather than add_relation_type
for CWComputedRType.
"""This module compare the Schema on the file system to the one in the database"""
from cStringIO import StringIO
from cubicweb.web.schemaviewer import SchemaViewer
from logilab.common.ureports import TextWriter
import difflib
viewer = SchemaViewer()
layout_db = viewer.visit_schema(schema, display_relations=True)
layout_fs = viewer.visit_schema(fsschema, display_relations=True)
writer = TextWriter()
stream_db = StringIO()
stream_fs = StringIO()
writer.format(layout_db, stream=stream_db)
writer.format(layout_fs, stream=stream_fs)
stream_db.seek(0)
stream_fs.seek(0)
db = stream_db.getvalue().splitlines()
fs = stream_fs.getvalue().splitlines()
open('db_schema.txt', 'w').write(stream_db.getvalue())
open('fs_schema.txt', 'w').write(stream_fs.getvalue())
#for diff in difflib.ndiff(fs, db):
# print diff