Slugmeta is a small utility to be used together with the very handy transmeta package (http://code.google.com/p/django-transmeta/). It is used for generating AdminModels where the prepopulated fields are translated with transmeta (I used it for translating slugs, hence the name).

Consider the following model

class Product(models.Model):
    __metaclass__ = TransMeta
    name = models.CharField(max_length=255)
    slug = models.SlugField(max_length=255, unique=True)

    class Meta:
        translate = ('name', 'slug')

With the following admin model

class ProductAdmin(admin.ModelAdmin):
    prepopulated_fields = {"slug": ("name",)}
admin.site.register(models.Product, ProductAdmin)

This will fail.

'ProductAdmin.prepopulated_fields' refers to field 'slug' that is missing from model 'Product'

Quite naturally; after all transmeta helpfully created slug_$LANG for each specified language for us, and removed the slug field.

With slugmeta, you set the SlugMeta as the metaclass of your ModelAdmin, and specify another member prepopulated_fields_translate instead of prepopulated_fields. We still have the same Product class as above.

import slugmeta

class ProductAdmin(admin.ModelAdmin):
    __metaclass__ = slugmeta.SlugMeta
    prepopulated_fields_translate = {"slug": ("name",)}
admin.site.register(models.Product, ProductAdmin)

This will loop through all the languages in your settings.LANGUAGES and create prepopulated_fields for all of them. For example, if your languages would be Spanish and Swedish, the above would be equivalent to

class ProductAdmin(admin.ModelAdmin):
    prepopulated_fields = {"slug_es": ("name_es",),
                           "slug_sv": ("name_sv",)}

You can combine this with normal -- untranslated -- prepopulated_fields. The following

class ProductAdmin(admin.ModelAdmin):
    __metaclass__ = slugmeta.SlugMeta
    prepopulated_fields = {"author_slug": ("author",)}
    prepopulated_fields_translate = {"slug": ("name",)}

is equivalent to

class ProductAdmin(admin.ModelAdmin):
    prepopulated_fields = {"author_slug": ("author",),
                           "slug_es": ("name_es",),
                           "slug_sv": ("name_sv",)}

Currently, all field names in prepopulated_fields_translate are considered to be translated. This is because the ModelAdmin class has no idea about what Model class its operating on. One solution would be to add a reference to the class for which it is the admin, so it could check the Meta.translate member of that class.

Copyright (c) 2011 Magnus Hult magnus@magnushult.se

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