Collection of helpers and mixins for translated projects (extracted from aldryn-translation-tools)

## Project description

Parler Tools extracts applicable methods from aldryn-translation-tools to be used without django-cms

## models.TranslatedAutoSlugMixin

This is a TranslatableModel mixin that automatically generates a suitable slug for the object on save().

If slug_globally_unique is True, then slugs will be required to be unique across all languages.

If slug_globally_unique is False (default), then the strategy used here is that it is OK for two objects to use the same slug if the slugs are for different languages. So if this were used on a translated Article model, these URLs would be valid:

/en/pain - An article in EN about physical discomfort

Of course, this means that when resolving an object from its URL, care must be taken to factor in the language segment of the URL too.

When using this mixin, it is important to also set the slug_source_field_name property on the implementing model to the name of the translated field which the slug is to be derived from. If you require more slugs to be derived from multiple fields (translated or otherwise), simply override the method get_slug_source to provide the source string for the slug.

### Configuration properties

#### slug_default

Provide a lazy translated string to use for the default slug should an object not have a source string to derive a slug from.

#### slug_field_name

Provide the name of the translated field in which generated slug shall be stored.

#### slug_globally_unique

A boolean flag controlling whether slugs are globally unique, or only unique with each language. Default value is False.

#### slug_max_length

Declares the max_length of slugs. This defaults to the max_length of the slug_field and is determined via introspection.

#### slug_separator

This determines the separator used before any index added to the slug. It does not determine the separator used in the slug itself, which is always -. This is only provided for compatibility with the slugify() method in aldryn_common, but it is not recommended to be used. Defaults to -.

#### slug_source_field_name

Provide the name of the translated field to be used for deriving the slug. If more than one field, or other complex sources are required, override the method get_slug_source() instead. Note that if get_slug_source() is overriden, it is recommended to also override get_slug_default().

### Public methods

#### get_slug_default

Naively constructs a translated default slug from the object. For better results, just set the slug_default property on the class to a lazy translated string. Alternatively, override this method if you need to more programmtically determine the default slug.

Example: If your model is “news article” and your source field is “title” this will return “news-article-without-title”.

#### get_slug_max_length

Accepts an optional parameter idx_len.

Introspects the slug field to determine the maximum length, taking into account a possible separator and up to a [idx_len]-digit number.

#### get_slug_source

Simply returns the value of the slug source field. Override for more complex situations such as using multiple fields (translated or not) as the source.

## Project details

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