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E.g. Given (Order, "user__groups"), return (Group, "user__order"). Final field must be a related model, not a data field. ii(RRRBRR'RRtrelated_query_nameRRRR=RtinsertR)( Rtpatht reversed_pathtparenttpiecestpieceRtdirecttm2mt related_name((s2../Django//lib/python/django/contrib/admin/util.pytreverse_field_path{s"      cCsf|jt}g}xJ|D]B}|r;t|d}n|}|j|jj|dqW|S(u; Return list of Fields given path relative to model. e.g. (ModelX, "user__groups__name") -> [ , , , ] ii(RRRR1RBR(RRRtfieldsRR((s2../Django//lib/python/django/contrib/admin/util.pytget_fields_from_paths  !cCs4yt|dWntk r/|d }nX|S(u0 Discard trailing non-relation field if extant. i(RR(R((s2../Django//lib/python/django/contrib/admin/util.pytremove_trailing_data_fields  cCst||}t|}|oJt|ddoJt|djdd}|s]tjSt|tjrs|Stj|SdS(u Return Q object for limiting choices if applicable. 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