ValidationError [u'ManagementForm data is missing or has been tampered with'] only in special cases

问题

When editing a model field through Django Admin, I'm getting a [u'ManagementForm data is missing or has been tampered with'] validation error.

Steps:

Edit a model through Django Admin and insert a special character (é,ñ)
The data is saved OK.
When editing again the model field (charField) the validation error is raised, whatever the input is.

When editing without special characters, the form is working ok.

Edit

When saving a special character, the inlines for that model doesn't show up in the edit section, so the validation error is correct in that case.

Relevant code:

class StreamInline(admin.TabularInline):
    model = Stream
    form = StreamForm
    extra = 0
    #define order
    fields = ('name', 'canal', 'tipo', 'stream_type',
              'unit', 'formula', 'label', 'color',
              ('min_scale', 'max_scale', 'fixed_scale'), 'enabled')
    readonly_fields = ['name', 'stream_type']
    can_delete = False

    class Media:
        js = ('js/jquery-1.7.2.min.js', 'js/jscolor.min.js',)


class NodeAdmin(admin.ModelAdmin):
    search_fields = ['name', ]

    fields = (('identifier', 'name', 'node_type'), ('group','cultivation') , ('longitude', 'latitude','operator','sim_card','telephone'), 'config', ('enabled', 'deleted'),('date_node','date_bat','reference_irrig_date'),'notes')
    list_display = ['identifier', 'name', 'group', 'sim_card']
    list_filter = ('group__name',)

    #form = NodeForm

    #list_filter = ['deleted', 'enabled', 'node_type']
    inlines = [StreamInline]

Django Version: 1.4.21

Python Version: 2.7.9

回答1:

The error: [u'ManagementForm data is missing or has been tampered with'] was because the inlines doesn't appear, so the MAX_TOTAL_FORMS and others doesn't concord.

The inlines didn't appear because there were errors in __unicode__ functions from the models.

Returning unicode type (python 2) in the __unicode__ function solved the issue.

来源：https://stackoverflow.com/questions/43923096/validationerror-umanagementform-data-is-missing-or-has-been-tampered-with-on

标签

python

django

django-admin