Get requested fields from ResolveInfo. Graphene python.

graphene.py

"""
MIT License

Copyright (c) 2018 Mitchel Cabuloy

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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copies of the Software, and to permit persons to whom the Software is
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The above copyright notice and this permission notice shall be included in all
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
"""
from graphql.core.utils.ast_to_dict import ast_to_dict


def collect_fields(node, fragments):
    """Recursively collects fields from the AST

    Args:
        node (dict): A node in the AST
        fragments (dict): Fragment definitions

    Returns:
        A dict mapping each field found, along with their sub fields.

        {'name': {},
         'sentimentsPerLanguage': {'id': {},
                                   'name': {},
                                   'totalSentiments': {}},
         'slug': {}}
    """

    field = {}

    if node.get('selection_set'):
        for leaf in node['selection_set']['selections']:
            if leaf['kind'] == 'Field':
                field.update({
                    leaf['name']['value']: collect_fields(leaf, fragments)
                })
            elif leaf['kind'] == 'FragmentSpread':
                field.update(collect_fields(fragments[leaf['name']['value']],
                                            fragments))

    return field


def get_fields(info):
    """A convenience function to call collect_fields with info

    Args:
        info (ResolveInfo)

    Returns:
        dict: Returned from collect_fields
    """

    fragments = {}
    node = ast_to_dict(info.field_asts[0])

    for name, value in info.fragments.items():
        fragments[name] = ast_to_dict(value)

    return collect_fields(node, fragments)

Also, here's an additional clause to fetch inline fragments on union types ( ...on UserType { name }).

You might want to rename the field to "On...".

elif leaf['kind'] == 'InlineFragment':
    field.update({
        leaf['type_condition']['name']['value']: collect_fields(leaf, fragments)
    })

I just have to say thank you. I was having a few issues that were driving me off the wall and this solved it in 10 seconds. Thank you!

Does not works for me. info.fragments.items() is always empty.

First of all Thank you!

and ast_to_dict has been refactored to

from graphql.utils.ast_to_dict import ast_to_dict

I guess.

Thanks and Regards,
Visweswaran N

It seems that it has been refactored again. Do you know where to find ast_to_dict?

Hi @ptrhck,

It seems that it has been refactored again. Do you know where to find ast_to_dict?

I'm still importing ast_to_dict from

from graphql.utils.ast_to_dict import ast_to_dict

info.field_asts doesn't seem to be available anymore. But this works:

requested_fields = [
    node.name.value for node in info.field_nodes[0].selection_set.selections
]