Django-haystack with xapian engine: impossibile eseguire update_index se il modello ha ManyToManyField

Question

Dopo l'aggiornamento di django alla 1.7 non posso eseguire il comando di gestione update_index.

Traceback (most recent call last): 
    File "/opt/pycharm-3.4.1/helpers/pydev/pydevd.py", line 1733, in <module> 
    debugger.run(setup['file'], None, None) 
    File "/opt/pycharm-3.4.1/helpers/pydev/pydevd.py", line 1226, in run 
    pydev_imports.execfile(file, globals, locals) # execute the script 
    File "/home/tochium/projects/povary/manage.py", line 10, in <module> 
    execute_from_command_line(sys.argv) 
    File "/home/tochium/projects/povary/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line 
    utility.execute() 
    File "/home/tochium/projects/povary/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 377, in execute 
    self.fetch_command(subcommand).run_from_argv(self.argv) 
    File "/home/tochium/projects/povary/local/lib/python2.7/site-packages/django/core/management/base.py", line 288, in run_from_argv 
    self.execute(*args, **options.__dict__) 
    File "/home/tochium/projects/povary/local/lib/python2.7/site-packages/django/core/management/base.py", line 338, in execute 
    output = self.handle(*args, **options) 
    File "/home/tochium/projects/povary/src/django-haystack/haystack/management/commands/update_index.py", line 184, in handle 
    return super(Command, self).handle(*items, **options) 
    File "/home/tochium/projects/povary/local/lib/python2.7/site-packages/django/core/management/base.py", line 503, in handle 
    label_output = self.handle_label(label, **options) 
    File "/home/tochium/projects/povary/src/django-haystack/haystack/management/commands/update_index.py", line 189, in handle_label 
    self.update_backend(label, using) 
    File "/home/tochium/projects/povary/src/django-haystack/haystack/management/commands/update_index.py", line 234, in update_backend 
    do_update(backend, index, qs, start, end, total, self.verbosity) 
    File "/home/tochium/projects/povary/src/django-haystack/haystack/management/commands/update_index.py", line 89, in do_update 
    backend.update(index, current_qs) 
    File "/home/tochium/projects/povary/src/xapian-haystack/xapian_backend.py", line 355, in update 
    data = index.full_prepare(obj) 
    File "/home/tochium/projects/povary/src/django-haystack/haystack/indexes.py", line 207, in full_prepare 
    self.prepared_data = self.prepare(obj) 
    File "/home/tochium/projects/povary/src/django-haystack/haystack/indexes.py", line 198, in prepare 
    self.prepared_data[field.index_fieldname] = field.prepare(obj) 
    File "/home/tochium/projects/povary/src/django-haystack/haystack/fields.py", line 159, in prepare 
    return self.convert(super(CharField, self).prepare(obj)) 
    File "/home/tochium/projects/povary/src/django-haystack/haystack/fields.py", line 106, in prepare 
    return current_object() 
    File "/home/tochium/projects/povary/local/lib/python2.7/site-packages/django/db/models/fields/related.py", line 839, in __call__ 
    manager = getattr(self.model, kwargs.pop('manager')) 
KeyError: u'manager' 

Io uso python2.7.6, Django 1.7, django-pagliaio 2.3.1, il motore di ricerca: Xapian

Credo che appare il problema perché Django dal metodo 1.7 add chiamata() per ManyRelatedManager e ora nel file /haystack/fields.py questa condizione si attiva.

if callable(current_object): 
    return current_object() 

Ma in chiamata manager_name Occorre definire, come possiamo vedere nella metodo appropriato

def __call__(self, **kwargs): 
     # We use **kwargs rather than a kwarg argument to enforce the 
     # `manager='manager_name'` syntax. 
     manager = getattr(self.model, kwargs.pop('manager')) 

Grazie.

Answer 1

Utilizzare un metodo personalizzato per restituire un array di stringhe o numeri interi (utilizzare modelli di stringhe se si desidera archiviare informazioni più complesse in un campo di indice a valutazione multipla).

class MyModelIndex(indexes.SearchIndex, indexes.Indexable): 
    my_m2m_field = indexes.CharField() 

    def prepare_my_m2m_field(self, my_model): 
     return [m2m.prop for m2m in my_model.m2m_field.all()] 

dichiarazione di campo per SOLR compresi i campi di sfaccettatura e completamento automatico:

<field name="my_m2m_field" type="text_general" indexed="true" stored="true" multiValued="true"/> 
<field name="my_m2m_field_exact" type="string" indexed="true" stored="false" multiValued="true"/> 
<field name="my_m2m_field_ac" type="ngram" indexed="true" stored="true" multiValued="true" 
     termVectors="true" termPositions="true" termOffsets="true"/> 
<copyField source="my_m2m_field" dest="emotion_exact" /> 
<copyField source="my_m2m_field" dest="emotion_ac" />