#29583: python manage.py inspectdb makes all fields with a default value blank=True, null=True -------------------------------------+------------------------------------- Reporter: kimballo | Owner: nobody Type: Bug | Status: new Component: Core | Version: 2.0 (Management commands) | Keywords: manage.py, Severity: Normal | inspectdb, models Triage Stage: | Has patch: 0 Unreviewed | Needs documentation: 0 | Needs tests: 0 Patch needs improvement: 0 | Easy pickings: 1 UI/UX: 0 | -------------------------------------+------------------------------------- Wasn't sure on the category or difficulty of fix, so logged it as an "easy pickings bug".
I'm using: Ubuntu 16.04 Python 3.7.0 Django 2.0.4 Mariadb 10.2.16 Before I get into this, I realize that -"Django is best suited for developing new applications" -This probably isn't a huge deal or a high priority ...BUT I figured I'd submit this anyway while I was thinking about it. Maybe it'll save someone some extra work down the line. Steps to reproduce: 1. Setup a legacy db in settings.py (see https://docs.djangoproject.com/en/2.0/howto/legacy-databases/) -Prerequisite: you have a column in one of your tables that has a default value. -Example: test_field int(11) DEFAULT 1 2. Run python manage.py inspectdb [--database DATABASE_NAME [ TABLE ] ] > models.py (or don't include "> models.py" and you can view the results from the command line) 3. Open models.py -test_field will look something like this: {{{test_field = models.IntegerField(blank=True, null=True)}}} -What I would expect: {{{test_field = models.IntegerField(default=1)}}} What I've been able to dig up: # https://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fdjango%2Fdjango%2Fblob%2Fmaster%2Fdjango%2Fcore%2Fmanagement%2Fcommands%2Finspectdb.py%23L144&sa=D&sntz=1&usg=AFQjCNGZLkFkaqIJ1Ap1dhXRB0jARXcCoA # from inspectdb.py (line 144, comments included in the original file, ) {{{ 142 # Add 'null' and 'blank', if the 'null_ok' flag was present in the 143 # table description. 144 if row[6]: # If it's NULL... 145 extra_params['blank'] = True 146 extra_params['null'] = True }}} # https://github.com/django/django/blob/master/django/db/backends/mysql/introspection.py#L95+info.column_default # from introspection.py in get_field_description (line 95, comment is mine) {{{ 86 fields = [] 87 for line in cursor.description: 88 info = field_info[line[0]] 89 fields.append(FieldInfo( 90 *line[:3], 91 to_int(info.max_len) or line[3], 92 to_int(info.num_prec) or line[4], 93 to_int(info.num_scale) or line[5], 94 line[6], 95 info.column_default, # THIS LINE IS JUST WHATEVER THE COLUMN DEFAULT IS 96 info.extra, 97 info.is_unsigned, 98 )) 99 return fields }}} I'm sure there are a lot of things I don't understand about this, but I don't think that having a default value should automatically add blank=True, null=True. Is having a default value really a "'null_ok' flag"? I think it should only put blank=True, null=True if the default is set to NULL in the column. Otherwise, it should set the default to whatever the default value is (ex: default=1) Caveat: I've only tested this with int fields. -- Ticket URL: <https://code.djangoproject.com/ticket/29583> Django <https://code.djangoproject.com/> The Web framework for perfectionists with deadlines. -- You received this message because you are subscribed to the Google Groups "Django updates" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-updates+unsubscr...@googlegroups.com. To post to this group, send email to django-updates@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/django-updates/051.c1d4aa479c7912262d1e636b04fa316d%40djangoproject.com. For more options, visit https://groups.google.com/d/optout.