How to add to a list type in Python Eve without replacing old values

Question

I have a very similar setup to the person in this question: How do I update a list data_relation in Python Eve with a users resource and a friends sub-resource of list type.

Answer 1

Here is the workaround that I used. It's probably not the most efficient way to do this, but it worked for me.

Instead of having a users/friends list like I had originally planned, I ended up creating a resource for shares. In my case, I wanted to know which crystals were shared with which users. So when I query crystals//shares, I should get a list of the shares for that crystal.

I think you could apply a solution like this to the users/friends scenario if you swap crystals for users and shares for friends. You might put two different user_id data_relations in your friends_schema (my shares_schema).

shares_schema = {
    'crystal_id': {
        'type': 'objectid',
        'required': True,
        'data_relation': {
            'resource': 'crystals',
            'embeddable': True,
        },
    },
    'user_id': {
        'type': 'objectid',
        'required': True,
        'data_relation': {
            'resource': 'users',
            'embeddable': True,
        },
    },
}

shares = {
    'internal_resource': True,
    'schema': shares_schema,
}

crystals_shares = {
    'schema': shares_schema,
    'url': 'crystals//shares',
    'datasource': {'source': 'shares'},
}