[Django Code] #5390: Add signals to ManyRelatedManager

[Django-3]

#5390: Add signals to ManyRelatedManager
------------------------------------------------+---------------------------
Reporter:  Ludovico Magnocavallo <ludo@...>  |       Owner:  nobody          
  Status:  new                                  |   Component:  Database wrapper
 Version:  SVN                                  |    Keywords:  manytomanyfield
   Stage:  Unreviewed                           |   Has_patch:  1              
------------------------------------------------+---------------------------
 There's currently no way to run some custom code when the
 ManyRelatedManager adds, removes, or clears objects. Extending the
 ManyRelatedManager is very hard, since it's dynamically created each time,
 and the ManyRelatedObjectsDescriptor prevents any access to it from its
 container class. A simple solution is to add three signals, and hook them
 into the dispatching mechanism when adding, removing, or deleting a
 related object.
 
 A typical use case for attaching custom code to a MayRelatedManager is
 blog categories: having a num_posts field in the Category models, and
 updating it each time a category is added/removed to/from a post, speeds
 up considerably a simple category list that excludes empty categories, and
 counts only published posts. The difference in resource usage is huge --
 one query with two simple filters against one query for the list, plus one
 for each category (yes, you can cache the output, but think eg of a multi-
 blog app where posts are frequently updated, and a cache miss is very
 expensive), and the resulting code is much simpler.
 
 A simple patch is attached to this ticket, I have tested it briefly
 against some of my models and it appears to work ok.

--
Ticket URL: <http://code.djangoproject.com/ticket/5390>
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[Django-3]

#5390: Add signals to ManyRelatedManager
---------------------------------------------------+------------------------
   Reporter:  Ludovico Magnocavallo <ludo@...>  |                Owner:  nobody          
     Status:  new                                  |            Component:  Database wrapper
    Version:  SVN                                  |           Resolution:                  
   Keywords:  manytomanyfield                      |                Stage:  Unreviewed      
  Has_patch:  1                                    |           Needs_docs:  0              
Needs_tests:  0                                    |   Needs_better_patch:  0              
---------------------------------------------------+------------------------
Changes (by Ludovico Magnocavallo <ludo@...>):

  * needs_better_patch:  => 0
  * needs_tests:  => 0
  * needs_docs:  => 0

Comment:

 Sending {{{source_col}}} and {{{target_col}}} to the dispatcher is
 probably unnecessary.

--
Ticket URL: <http://code.djangoproject.com/ticket/5390#comment:1>
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[Django-3]

#5390: Add signals to ManyRelatedManager
---------------------------------------------------+------------------------
   Reporter:  Ludovico Magnocavallo <ludo@...>  |                Owner:  nobody          
     Status:  new                                  |            Component:  Database wrapper
    Version:  SVN                                  |           Resolution:                  
   Keywords:  manytomanyfield                      |                Stage:  Unreviewed      
  Has_patch:  1                                    |           Needs_docs:  0              
Needs_tests:  0                                    |   Needs_better_patch:  0              
---------------------------------------------------+------------------------
Comment (by Ludovico Magnocavallo <ludo@...>):

 I attached a cleaner patch that does away with sending the field names,
 and some test cases with the necessary models.

--
Ticket URL: <http://code.djangoproject.com/ticket/5390#comment:2>
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[Django-3]

#5390: Add signals to ManyRelatedManager
---------------------------------------------------+------------------------
   Reporter:  Ludovico Magnocavallo <ludo@...>  |                Owner:  nobody          
     Status:  new                                  |            Component:  Database wrapper
    Version:  SVN                                  |           Resolution:                  
   Keywords:  manytomanyfield feature              |                Stage:  Unreviewed      
  Has_patch:  1                                    |           Needs_docs:  0              
Needs_tests:  0                                    |   Needs_better_patch:  0              
---------------------------------------------------+------------------------
Comment (by ubernostrum):

 #1069 and #2861 were duplicates.

--
Ticket URL: <http://code.djangoproject.com/ticket/5390#comment:4>
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[Django-3]

#5390: Add signals to ManyRelatedManager
---------------------------------------------------+------------------------
   Reporter:  Ludovico Magnocavallo <ludo@...>  |                Owner:  nobody          
     Status:  new                                  |            Component:  Database wrapper
    Version:  SVN                                  |           Resolution:                  
   Keywords:  manytomanyfield feature              |                Stage:  Unreviewed      
  Has_patch:  1                                    |           Needs_docs:  0              
Needs_tests:  0                                    |   Needs_better_patch:  0              
---------------------------------------------------+------------------------
Comment (by ubernostrum):

 #3854 was a duplicate.

--
Ticket URL: <http://code.djangoproject.com/ticket/5390#comment:5>
Django Code <http://code.djangoproject.com/>
The web framework for perfectionists with deadlines
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[Django-3]

#5390: Add signals to ManyRelatedManager
---------------------------------------------------+------------------------
   Reporter:  Ludovico Magnocavallo <ludo@...>  |                Owner:  nobody          
     Status:  new                                  |            Component:  Database wrapper
    Version:  SVN                                  |           Resolution:                  
   Keywords:  manytomanyfield feature              |                Stage:  Unreviewed      
  Has_patch:  1                                    |           Needs_docs:  0              
Needs_tests:  0                                    |   Needs_better_patch:  0              
---------------------------------------------------+------------------------
Changes (by Silviu Julean <sjulean@...>):

 * cc: sjulean@... (added)

Comment:

 I am using this patch to monitor user-group mapping in contrib.auth, and
 it works without any glitches.

--
Ticket URL: <http://code.djangoproject.com/ticket/5390#comment:6>
Django Code <http://code.djangoproject.com/>
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[Django-3]

#5390: Add signals to ManyRelatedManager
---------------------------------------------------+------------------------
   Reporter:  Ludovico Magnocavallo <ludo@...>  |                Owner:  nobody          
     Status:  new                                  |            Component:  Database wrapper
    Version:  SVN                                  |           Resolution:                  
   Keywords:  manytomanyfield feature              |                Stage:  Unreviewed      
  Has_patch:  1                                    |           Needs_docs:  0              
Needs_tests:  0                                    |   Needs_better_patch:  0              
---------------------------------------------------+------------------------
Changes (by ekarulf):

 * cc: django@... (added)

Comment:

 I am also using the patch to monitor contrib.auth user-group relationships
 with no problems.

--
Ticket URL: <http://code.djangoproject.com/ticket/5390#comment:7>
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The web framework for perfectionists with deadlines
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[Django-3]

#5390: Add signals to ManyRelatedManager
---------------------------------------------------+------------------------
   Reporter:  Ludovico Magnocavallo <ludo@...>  |                Owner:  nobody                
     Status:  new                                  |            Component:  Database wrapper      
    Version:  SVN                                  |           Resolution:                        
   Keywords:  manytomanyfield feature              |                Stage:  Design decision needed
  Has_patch:  1                                    |           Needs_docs:  0                    
Needs_tests:  0                                    |   Needs_better_patch:  0                    
---------------------------------------------------+------------------------
Changes (by mtredinnick):

  * stage:  Unreviewed => Design decision needed

--
Ticket URL: <http://code.djangoproject.com/ticket/5390#comment:8>
Django Code <http://code.djangoproject.com/>
The web framework for perfectionists with deadlines
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[Django-3]

#5390: Add signals to ManyRelatedManager
----------------------------------------------------------+-----------------
          Reporter:  Ludovico Magnocavallo <ludo@...>  |         Owner:  nobody                
            Status:  new                                  |     Milestone:                        
         Component:  Database wrapper                     |       Version:  SVN                    
        Resolution:                                       |      Keywords:  manytomanyfield feature
             Stage:  Design decision needed               |     Has_patch:  1                      
        Needs_docs:  0                                    |   Needs_tests:  0                      
Needs_better_patch:  0                                    |  
----------------------------------------------------------+-----------------
Changes (by anonymous):

 * cc: thiago.salves@... (added)

--
Ticket URL: <http://code.djangoproject.com/ticket/5390#comment:16>
Django Code <http://code.djangoproject.com/>
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[Django-3]

#5390: Add signals to ManyRelatedManager
----------------------------------------------------------+-----------------
          Reporter:  Ludovico Magnocavallo <ludo@...>  |         Owner:  nobody                
            Status:  new                                  |     Milestone:                        
         Component:  Database layer (models, ORM)         |       Version:  SVN                    
        Resolution:                                       |      Keywords:  manytomanyfield feature
             Stage:  Design decision needed               |     Has_patch:  1                      
        Needs_docs:  0                                    |   Needs_tests:  0                      
Needs_better_patch:  0                                    |  
----------------------------------------------------------+-----------------
Changes (by rvdrijst):

 * cc: rvdrijst (added)

Comment:

 #6778 was a duplicate

--
Ticket URL: <http://code.djangoproject.com/ticket/5390#comment:18>
Django <http://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
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[Django-3]

#5390: Add signals to ManyRelatedManager
----------------------------------------------------------+-----------------
          Reporter:  Ludovico Magnocavallo <ludo@...>  |         Owner:  nobody                        
            Status:  new                                  |     Milestone:  post-1.0                      
         Component:  Database layer (models, ORM)         |       Version:  SVN                            
        Resolution:                                       |      Keywords:  manytomanyfield feature signals
             Stage:  Design decision needed               |     Has_patch:  1                              
        Needs_docs:  1                                    |   Needs_tests:  0                              
Needs_better_patch:  1                                    |  
----------------------------------------------------------+-----------------
Changes (by rvdrijst):

  * keywords:  manytomanyfield feature => manytomanyfield feature signals
  * needs_better_patch:  0 => 1
  * needs_docs:  0 => 1
  * milestone:  => post-1.0

Comment:

 I have started a discussion on django-developers concerning this ticket
 and the limitations I have encountered:
 http://groups.google.com/group/django-
 developers/browse_thread/thread/afe6ad7994d868ba

 Hopefully, this will push development and get this feature in the 1.1alhpa
 scheduled for january '09.

 If you are interested, please read and comment there. If discussion is
 fruitful, I will claim the ticket and improve the patch, docs and tests.

 Additionally, not related to the functionality but to the documentation:
 the db-api.txt is not the right place for signal documentation (there is
 no talk of pre/post_save signals there either). The correct place seems
 docs/ref/signals.txt. Also, not only the names of the signals, but also
 the extra arguments will need to be described.

--
Ticket URL: <http://code.djangoproject.com/ticket/5390#comment:19>
Django <http://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
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[Django-3]

#5390: Add signals to ManyRelatedManager
----------------------------------------------------------+-----------------
          Reporter:  Ludovico Magnocavallo <ludo@...>  |         Owner:  nobody                        
            Status:  new                                  |     Milestone:  post-1.0                      
         Component:  Database layer (models, ORM)         |       Version:  SVN                            
        Resolution:                                       |      Keywords:  manytomanyfield feature signals
             Stage:  Design decision needed               |     Has_patch:  1                              
        Needs_docs:  1                                    |   Needs_tests:  0                              
Needs_better_patch:  1                                    |  
----------------------------------------------------------+-----------------
Changes (by piranha):

 * cc: piranha@... (added)

--
Ticket URL: <http://code.djangoproject.com/ticket/5390#comment:20>
Django <http://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
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[Django-3]

#5390: Add signals to ManyRelatedManager
----------------------------------------------------------+-----------------
          Reporter:  Ludovico Magnocavallo <ludo@...>  |         Owner:  rvdrijst                      
            Status:  assigned                             |     Milestone:  post-1.0                      
         Component:  Database layer (models, ORM)         |       Version:  SVN                            
        Resolution:                                       |      Keywords:  manytomanyfield feature signals
             Stage:  Design decision needed               |     Has_patch:  1                              
        Needs_docs:  0                                    |   Needs_tests:  0                              
Needs_better_patch:  0                                    |  
----------------------------------------------------------+-----------------
Changes (by rvdrijst):

  * owner:  nobody => rvdrijst
  * needs_better_patch:  1 => 0
  * status:  new => assigned
  * needs_docs:  1 => 0

Comment:

 I have attached a new patch that combines the changes to the code, the
 documentation and the tests in one file.

 The biggest change is that there is now only one signal, m2m_changed, that
 has an 'action' parameter (based on a comment of Malcolm Tredinnick.
 The other parameters have changed somewhat, please discuss
 problems/suggestions on the django-developer thread mentioned above, where
 I have also posted a short explanation of the new parameters.

 And thanks to Ludovico for the initial implementation.

--
Ticket URL: <http://code.djangoproject.com/ticket/5390#comment:21>
Django <http://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
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[Django-3]

#5390: Add signals to ManyRelatedManager
----------------------------------------------------------+-----------------
          Reporter:  Ludovico Magnocavallo <ludo@...>  |         Owner:  rvdrijst                      
            Status:  assigned                             |     Milestone:                                
         Component:  Database layer (models, ORM)         |       Version:  SVN                            
        Resolution:                                       |      Keywords:  manytomanyfield feature signals
             Stage:  Design decision needed               |     Has_patch:  1                              
        Needs_docs:  0                                    |   Needs_tests:  0                              
Needs_better_patch:  0                                    |  
----------------------------------------------------------+-----------------
Comment (by wmdmark):

 +1 Please include this fix in the upcoming release. I'm having to do some
 awful code hacks to get around this.

--
Ticket URL: <http://code.djangoproject.com/ticket/5390#comment:23>
Django <http://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
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[Django-3]

#5390: Add signals to ManyRelatedManager
----------------------------------------------------------+-----------------
          Reporter:  Ludovico Magnocavallo <ludo@...>  |         Owner:  rvdrijst                      
            Status:  assigned                             |     Milestone:                                
         Component:  Database layer (models, ORM)         |       Version:  SVN                            
        Resolution:                                       |      Keywords:  manytomanyfield feature signals
             Stage:  Design decision needed               |     Has_patch:  1                              
        Needs_docs:  0                                    |   Needs_tests:  0                              
Needs_better_patch:  0                                    |  
----------------------------------------------------------+-----------------
Comment (by ubernostrum):

 Replying to [comment:23 wmdmark]:
 > +1 Please include this fix in the upcoming release. I'm having to do
 some awful code hacks to get around this.

 You do realize the feature freeze for 1.1 has passed already, right (in
 fact, 1.1 is behind schedule because we delayed a bit for a late-running
 feature)? No new feature checkins will happen until after the release, at
 which point proposals for inclusion in 1.2 will open.

 If you're really interested in getting a feature into Django, it's in your
 best interest to get involved on the developers' list and pay attention to
 the release schedule.

--
Ticket URL: <http://code.djangoproject.com/ticket/5390#comment:24>
Django <http://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
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[Django-3]

#5390: Add signals to ManyRelatedManager
----------------------------------------------------------+-----------------
          Reporter:  Ludovico Magnocavallo <ludo@...>  |         Owner:  rvdrijst                      
            Status:  assigned                             |     Milestone:                                
         Component:  Database layer (models, ORM)         |       Version:  SVN                            
        Resolution:                                       |      Keywords:  manytomanyfield feature signals
             Stage:  Design decision needed               |     Has_patch:  1                              
        Needs_docs:  0                                    |   Needs_tests:  0                              
Needs_better_patch:  0                                    |  
----------------------------------------------------------+-----------------
Changes (by palewire):

 * cc: palewire@... (added)

--
Ticket URL: <http://code.djangoproject.com/ticket/5390#comment:25>
Django <http://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
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[Django-3]

#5390: Add signals to ManyRelatedManager
----------------------------------------------------------+-----------------
          Reporter:  Ludovico Magnocavallo <ludo@...>  |         Owner:  rvdrijst                      
            Status:  assigned                             |     Milestone:                                
         Component:  Database layer (models, ORM)         |       Version:  SVN                            
        Resolution:                                       |      Keywords:  manytomanyfield feature signals
             Stage:  Design decision needed               |     Has_patch:  1                              
        Needs_docs:  0                                    |   Needs_tests:  0                              
Needs_better_patch:  0                                    |  
----------------------------------------------------------+-----------------
Changes (by schmeii):

 * cc: maxischmeii@... (added)

--
Ticket URL: <http://code.djangoproject.com/ticket/5390#comment:26>
Django <http://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
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[Django-3]

#5390: Add signals to ManyRelatedManager
----------------------------------------------------------+-----------------
          Reporter:  Ludovico Magnocavallo <ludo@...>  |         Owner:  rvdrijst                      
            Status:  assigned                             |     Milestone:                                
         Component:  Database layer (models, ORM)         |       Version:  SVN                            
        Resolution:                                       |      Keywords:  manytomanyfield feature signals
             Stage:  Design decision needed               |     Has_patch:  1                              
        Needs_docs:  0                                    |   Needs_tests:  0                              
Needs_better_patch:  0                                    |  
----------------------------------------------------------+-----------------
Changes (by UloPe):

 * cc: django@... (added)

--
Ticket URL: <http://code.djangoproject.com/ticket/5390#comment:27>
Django <http://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
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[Django-3]

#5390: Add signals to ManyRelatedManager
----------------------------------------------------------+-----------------
          Reporter:  Ludovico Magnocavallo <ludo@...>  |         Owner:  rvdrijst                      
            Status:  assigned                             |     Milestone:                                
         Component:  Database layer (models, ORM)         |       Version:  SVN                            
        Resolution:                                       |      Keywords:  manytomanyfield feature signals
             Stage:  Design decision needed               |     Has_patch:  1                              
        Needs_docs:  0                                    |   Needs_tests:  0                              
Needs_better_patch:  0                                    |  
----------------------------------------------------------+-----------------
Changes (by lvscar):

 * cc: lvscar@... (added)

--
Ticket URL: <http://code.djangoproject.com/ticket/5390#comment:28>
Django <http://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
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[Django-3]

#5390: Add signals to ManyRelatedManager
----------------------------------------------------------+-----------------
          Reporter:  Ludovico Magnocavallo <ludo@...>  |         Owner:  rvdrijst                      
            Status:  assigned                             |     Milestone:                                
         Component:  Database layer (models, ORM)         |       Version:  SVN                            
        Resolution:                                       |      Keywords:  manytomanyfield feature signals
             Stage:  Design decision needed               |     Has_patch:  1                              
        Needs_docs:  0                                    |   Needs_tests:  0                              
Needs_better_patch:  0                                    |  
----------------------------------------------------------+-----------------
Changes (by bhagany):

 * cc: brent.hagany@... (added)

--
Ticket URL: <http://code.djangoproject.com/ticket/5390#comment:29>
Django <http://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
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