Re: function to create objects in a given model

[chansonsyiddish]

Thanks a lot, Tom, I think this is just what I need, I will try it asap 
and see which is better, between the two solutions.


Regards,
Hélène




On 21/05/2014 19:35, Tom Lockhart wrote:
On 2014-05-21, at 9:15 AM, chansonsyiddish > wrote:



Thanks, Tom,

I'm not sure I need to use signals altogether, as I know when a Song 
is added. If I make a method in the Song model, I suppose I can 
import the model and run it in the shell? Or is there a way I could 
run it directly from the admin site?


Yes and yes.

python manage.py shell
>>> from yourapp.models import Song
>>> s = Song.objects.get(title='your title here')
>>> s.make_words()

For the admin interface, look at the actions keyword for admin 
classes. Something like


class SongAdmin(admin.ModelAdmin):
  ...
  actions = ['gen_words']
  ...
  def gen_words(self, request, queryset):
for obj in queryset:
  obj.make_words()
  pass
return
gen_words.description='Generate words for selected songs'

To do the same for all songs at once you can implement a management 
command for the command line or if in the admin GUI you will likely 
want to implement a GUI button. I'd stayed away from GUI buttons 
previously but it turns out to be pretty simple once you have one done.


hth

 - Tom




Hélène




On 21/05/2014 17:15, Tom Lockhart wrote:
On 2014-05-20, at 12:26 PM, "C. Kirby" > wrote:


I would strongly suggest you use signals 
.


This nicely enables an automatic path of execution. But if you also 
want to execute this code, say, from the admin interface or 
separately for testing then you may want to package the fundamental 
code into a method of the Song model, then run that method in the 
signal handler.


hth

- Tom




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Re: function to create objects in a given model

[Tom Lockhart]

On 2014-05-21, at 9:15 AM, chansonsyiddish  wrote:

> Thanks, Tom,
> 
> I'm not sure I need to use signals altogether, as I know when a Song is 
> added. If I make a method in the Song model, I suppose I can import the model 
> and run it in the shell? Or is there a way I could run it directly from the 
> admin site? 

Yes and yes.

python manage.py shell
>>> from yourapp.models import Song
>>> s = Song.objects.get(title='your title here')
>>> s.make_words()

For the admin interface, look at the actions keyword for admin classes. 
Something like

class SongAdmin(admin.ModelAdmin):
  ...
  actions = ['gen_words']
  ...
  def gen_words(self, request, queryset):
for obj in queryset:
  obj.make_words()
  pass
return
gen_words.description='Generate words for selected songs'

To do the same for all songs at once you can implement a management command for 
the command line or if in the admin GUI you will likely want to implement a GUI 
button. I'd stayed away from GUI buttons previously but it turns out to be 
pretty simple once you have one done.

hth

 - Tom


> 
> Hélène
> 
> 
> 
> 
> On 21/05/2014 17:15, Tom Lockhart wrote:
>> On 2014-05-20, at 12:26 PM, "C. Kirby"  wrote:
>> 
>>> I would strongly suggest you use signals.
>> 
>> This nicely enables an automatic path of execution. But if you also want to 
>> execute this code, say, from the admin interface or separately for testing 
>> then you may want to package the fundamental code into a method of the Song 
>> model, then run that method in the signal handler.
>> 
>> hth
>> 
>> - Tom
>> 
> 
> 
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Re: function to create objects in a given model

[chansonsyiddish]

Thanks, Tom,

I'm not sure I need to use signals altogether, as I know when a Song is 
added. If I make a method in the Song model, I suppose I can import the 
model and run it in the shell? Or is there a way I could run it directly 
from the admin site?


Hélène




On 21/05/2014 17:15, Tom Lockhart wrote:
On 2014-05-20, at 12:26 PM, "C. Kirby" > wrote:


I would strongly suggest you use signals 
.


This nicely enables an automatic path of execution. But if you also 
want to execute this code, say, from the admin interface or separately 
for testing then you may want to package the fundamental code into a 
method of the Song model, then run that method in the signal handler.


hth

- Tom



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Re: function to create objects in a given model

[Chansons]

Thanks a lot, I'll try that.
Hélène


Le mardi 20 mai 2014 20:50:34 UTC+2, Ilya Kazakevich a écrit :
>
> Hello, 
>
> Try managers: https://docs.djangoproject.com/en/1.6/topics/db/managers/ 
>
> Ilya Kazakevich, 
> JetBrains PyCharm (Best Python/Django IDE) 
> http://www.jetbrains.com/pycharm/ 
> "Develop with pleasure!" 
>
>
> >-Original Message- 
> >From: django...@googlegroups.com  
> >[mailto:django...@googlegroups.com ] On Behalf Of Chansons 
> >Sent: Tuesday, May 20, 2014 7:10 PM 
> >To: django...@googlegroups.com  
> >Subject: function to create objects in a given model 
> > 
> >Hello everybody, 
> > 
> >I'm new to django, and writing my first app, I have a question before 
> deploying it. 
> > 
> >I need to have a function that would create or modify, according to a few 
> rules 
> >and a precise instance of a model (Song), many instances of another model 
> >(Words) at once. 
> >Writing that function is easy, my problem is, where should I put it, so 
> it's easy to 
> >use when the application will be in production? 
> >Should it be in the model layer? Or in a separate module? Will I call it 
> with the 
> >shell? Is it possible to access it via the admin site? Or any other way? 
> > 
> >I don't find anything about that in the docs, or in google, any ideas 
> will be 
> >welcome. I can be more precise if needed... 
> >Thanks 
> > 
> > 
> > 
> > 
> >-- 
> >You received this message because you are subscribed to the Google Groups 
> >"Django users" group. 
> >To unsubscribe from this group and stop receiving emails from it, send an 
> email to 
> >django-users...@googlegroups.com . 
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> >django...@googlegroups.com. 
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> >To view this discussion on the web visit 
> >
> https://groups.google.com/d/msgid/django-users/81d42f98-04da-4e8f-8c0b-3ac 
> >86601e116%40googlegroups.com 
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> https://groups.google.com/d/msgid/django-users/81d42f98-04da-4e8f-8c0b-3a 
> >c86601e116%40googlegroups.com?utm_medium=email&utm_source=footer> . 
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>

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RE: function to create objects in a given model

[Ilya Kazakevich]

Hello, 

Try managers: https://docs.djangoproject.com/en/1.6/topics/db/managers/

Ilya Kazakevich,
JetBrains PyCharm (Best Python/Django IDE)
http://www.jetbrains.com/pycharm/
"Develop with pleasure!"


>-Original Message-
>From: django-users@googlegroups.com
>[mailto:django-users@googlegroups.com] On Behalf Of Chansons
>Sent: Tuesday, May 20, 2014 7:10 PM
>To: django-users@googlegroups.com
>Subject: function to create objects in a given model
>
>Hello everybody,
>
>I'm new to django, and writing my first app, I have a question before 
>deploying it.
>
>I need to have a function that would create or modify, according to a few rules
>and a precise instance of a model (Song), many instances of another model
>(Words) at once.
>Writing that function is easy, my problem is, where should I put it, so it's 
>easy to
>use when the application will be in production?
>Should it be in the model layer? Or in a separate module? Will I call it with 
>the
>shell? Is it possible to access it via the admin site? Or any other way?
>
>I don't find anything about that in the docs, or in google, any ideas will be
>welcome. I can be more precise if needed...
>Thanks
>
>
>
>
>--
>You received this message because you are subscribed to the Google Groups
>"Django users" group.
>To unsubscribe from this group and stop receiving emails from it, send an 
>email to
>django-users+unsubscr...@googlegroups.com.
>To post to this group, send email to django-users@googlegroups.com.
>Visit this group at http://groups.google.com/group/django-users.
>To view this discussion on the web visit
>https://groups.google.com/d/msgid/django-users/81d42f98-04da-4e8f-8c0b-3ac
>86601e116%40googlegroups.com
><https://groups.google.com/d/msgid/django-users/81d42f98-04da-4e8f-8c0b-3a
>c86601e116%40googlegroups.com?utm_medium=email&utm_source=footer> .
>For more options, visit https://groups.google.com/d/optout.


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Re: function to create objects in a given model

[Chansons]

Hello,

thanks for your answer, I knew about fixtures, but I'm not sure it's really 
adapted to what I need.

Adding or modifying those instances of a model will depend on a precise 
instance of another model: when I create a song, I also want to find in the 
existing glossary / or add the words of the song. I will have to do that 
often, each time I add a new song. 
If I use fixture, I would have to modify or create the instances 'outside' 
the application, and use loaddata afterwards. 

Isn't there an easier, more direct way to do this? Or perhaps, I didn't 
quite understand what you meant by that?

 



Le mardi 20 mai 2014 17:32:19 UTC+2, Venkatraman.S. a écrit :
>
>
> https://docs.djangoproject.com/en/dev/howto/initial-data/
>
> -V 
>

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Re: function to create objects in a given model

[Venkatraman S]

On Tue, May 20, 2014 at 8:39 PM, Chansons  wrote:

> Hello everybody,
>
> I'm new to django, and writing my first app, I have a question before
> deploying it.
>
> I need to have a function that would create or modify, according to a few
> rules and a precise instance of a model (Song), many instances of another
> model (Words) at once.
> Writing that function is easy, my problem is, where should I put it, so
> it's easy to use when the application will be in production?
> Should it be in the model layer? Or in a separate module? Will I call it
> with the shell? Is it possible to access it via the admin site? Or any
> other way?
>
>
https://docs.djangoproject.com/en/dev/howto/initial-data/

-V

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function to create objects in a given model

[Chansons]

Hello everybody,

I'm new to django, and writing my first app, I have a question before 
deploying it.

I need to have a function that would create or modify, according to a few 
rules and a precise instance of a model (Song), many instances of another 
model (Words) at once. 
Writing that function is easy, my problem is, where should I put it, so 
it's easy to use when the application will be in production? 
Should it be in the model layer? Or in a separate module? Will I call it 
with the shell? Is it possible to access it via the admin site? Or any 
other way?

I don't find anything about that in the docs, or in google, any ideas will 
be welcome. I can be more precise if needed...
Thanks


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