graphql-query

graphql-query

graphql_query is a complete Domain Specific Language (DSL) for GraphQL query in Python. With this package you can to

• generate a correct GraphQL query string from a python classes;
• use and share similar Arguments, Variables and e.t.c between different queries;
• easily add new fields to your query;
• add Fragments and Directives to queries;
• generate graphql_query classes from pydantic data-model;

The documentation for graphql_query can be found at https://denisart.github.io/graphql-query/.

Quickstart

Install with pip

pip install graphql_query

Simple query

Code for the simple query

{
  hero {
    name
  }
}

it is

from graphql_query import Operation, Query

hero = Query(name="hero", fields=["name"])
operation = Operation(type="query", queries=[hero])

print(operation.render())
"""
query {
  hero {
    name
  }
}
"""

The render method for the graphql_query.Operation object just returns the final string with a query. Inside the fields array of the graphql_query.Query object you can use

• str (a field name);
• object of graphql_query.Field type;
• graphql_query.Fragment and graphql_query.InlineFragment.

Arguments, Variables and Directives

For generation of the following query

query Hero($episode: Episode, $withFriends: Boolean!) {
  hero(episode: $episode) {
    name
    friends @include(if: $withFriends) {
      name
    }
  }
}

we can use the following python code

from graphql_query import Argument, Directive, Field, Operation, Query, Variable

episode = Variable(name="episode", type="Episode")
withFriends = Variable(name="withFriends", type="Boolean!")

arg_episode = Argument(name="episode", value=episode)
arg_if = Argument(name="if", value=withFriends)

hero = Query(
    name="hero",
    arguments=[arg_episode],
    fields=[
        "name",
        Field(
            name="friends",
            fields=["name"],
            directives=[Directive(name="include", arguments=[arg_if])]
        )
    ]
)
operation = Operation(
    type="query",
    name="Hero",
    variables=[episode, withFriends],
    queries=[hero]
)
print(operation.render())
"""
query Hero(
  $episode: Episode
  $withFriends: Boolean!
) {
  hero(
    episode: $episode
  ) {
    name
    friends @include(
      if: $withFriends
    ) {
      name
    }
  }
}
"""

You can find other examples in the documentation.