Re: LaTeX custom Field, png url
On Mon, Feb 16, 2009 at 12:05 PM, alain31 wrote: > > What I understood reading custom-model-fields.html is that Field class > only handle one column in database > (db_type method returns a database type...). I first thought to > inherit from TextField and build the name of the png file using a hash > from > the LaTeX string (so no need to store it in the database), or store a > string made of concatenation of LaTeX string + url > but I imagine that there must be a cleaner way to do it no? > > > > If you take a look at how Generic Foreign Key fields are used the user defines 2 fields on the model, and then the generic foreign key acts as a psuedofield(it exists in python, but not the DB) and combines the data from both those fields. That's how I would do it, take a look at django.contrib.cotnenttypes.generic to see how that's implemented. Alex -- "I disapprove of what you say, but I will defend to the death your right to say it." --Voltaire "The people's good is the highest law."--Cicero --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~--~~~~--~~--~--~---
Re: LaTeX custom Field, png url
What I understood reading custom-model-fields.html is that Field class only handle one column in database (db_type method returns a database type...). I first thought to inherit from TextField and build the name of the png file using a hash from the LaTeX string (so no need to store it in the database), or store a string made of concatenation of LaTeX string + url but I imagine that there must be a cleaner way to do it no? --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~--~~~~--~~--~--~---
Re: LaTeX custom Field, png url
On Mon, Feb 16, 2009 at 10:40 AM, alain31 wrote:
>
> Hello,
> I plan to use django for some projects with heavy use of math formulas
> and I would like to create a reusable custom field to store LaTeX
> strings and to get a png image on disk after compilation. The usage
> would go like this :
> model:
> formula = LatexField()
> template to get the png:
> {{model.formula.url}}
> Before saving the field, I compile the string on server with LaTeX and
> make a png stored in a local file.
>
> I have the following question : I need to store in the database the
> LaTeX string as well as the url of the
> png image and I wonder how to do it (I looked at FileField,
> ImageField but only the url is saved in the database). Another point,
> it would be nice to create a specific form to see the errors during
> LaTeX compilation and to correct them before saving the field in the
> database.
>
> Any suggestions, starting point in docs ?
> Thanks.
>
> >
>
Here's a guide on writing a custom model field:
http://docs.jezdez.com/howto/custom-model-fields.html . My guess is you'll
actually need 2 real fields in the DB, with one psuedofield similar to the
generic foreign key that actually handles combining those 2 into a real
item.
Alex
--
"I disapprove of what you say, but I will defend to the death your right to
say it." --Voltaire
"The people's good is the highest law."--Cicero
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LaTeX custom Field, png url
Hello,
I plan to use django for some projects with heavy use of math formulas
and I would like to create a reusable custom field to store LaTeX
strings and to get a png image on disk after compilation. The usage
would go like this :
model:
formula = LatexField()
template to get the png:
{{model.formula.url}}
Before saving the field, I compile the string on server with LaTeX and
make a png stored in a local file.
I have the following question : I need to store in the database the
LaTeX string as well as the url of the
png image and I wonder how to do it (I looked at FileField,
ImageField but only the url is saved in the database). Another point,
it would be nice to create a specific form to see the errors during
LaTeX compilation and to correct them before saving the field in the
database.
Any suggestions, starting point in docs ?
Thanks.
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