Re: Custom sort order for YAML output

[BEGIN]

import yaml

def represent_dict(self, data):
    def key_function((key,value)):
        # Prioritizes certain keys when sorting.
        prio = {"model":0,"pk":1,"fields":2}.get(key,99)
        return (prio, key)
    items = data.items()
    items.sort(key=key_function)
    return self.represent_mapping(u'tag:yaml.org,2002:map', items)

yaml.add_representer(represent_dict)

[END]

Sam Kuper skrev:
> Dear list,
>
> Bearing in mind I'm new to PyYAML, please could you help with the 
> following.
>
> I'm using PyYAML to convert dumped YAML data from Django (which is 
> flow style by default) into block style via the following Python script:
>
> [BEGIN]...[END]
>
> This works, but I'd like to output the data in the order shown here 
> <http://docs.djangoproject.com/en/dev/howto/initial-data/#providing-initial-data-with-fixtures> 
> - in other words, in the form:
>
> - model:
>   pk:
>   fields:
>
> I'd also like the fields to be sorted alphabetically.
>
> This ticket <http://pyyaml.org/ticket/23> suggests to me that this 
> should be possible, but I'm not sure how best to insert a "custom 
> representer" into the script above, in order to get the result I'm 
> seeking.
>
> I'd be grateful for any help you can offer.
>
> Many thanks in advance,
>
> Sam

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