Add migration for converting existing Submission.authors to JSON

- Legacy-Id: 12746

ietf/submit/migrations/0019_auto_20170127_0538.py

@@ -0,0 +1,44 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations
+import jsonfield.fields
+
+def parse_email_line(line):
+    """Split line on the form 'Some Name <email@example.com>'"""
+    import re
+    m = re.match("([^<]+) <([^>]+)>$", line)
+    if m:
+        return dict(name=m.group(1), email=m.group(2))
+    else:
+        return dict(name=line, email="")
+
+def parse_authors(author_lines):
+    res = []
+    for line in author_lines.replace("\r", "").split("\n"):
+        line = line.strip()
+        if line:
+            res.append(parse_email_line(line))
+    return res
+
+def convert_author_lines_to_json(apps, schema_editor):
+    import json
+
+    Submission = apps.get_model("submit", "Submission")
+    for s in Submission.objects.all().iterator():
+        Submission.objects.filter(pk=s.pk).update(authors=json.dumps(parse_authors(s.authors)))
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('submit', '0018_auto_20170116_0927'),
+    ]
+
+    operations = [
+        migrations.RunPython(convert_author_lines_to_json, migrations.RunPython.noop),
+        migrations.AlterField(
+            model_name='submission',
+            name='authors',
+            field=jsonfield.fields.JSONField(default=list, help_text=b'List of authors with name, email, affiliation and country code.'),
+        ),
+    ]