Trait graphql_client::GraphQLQuery

pub trait GraphQLQuery {
    type Variables: Serialize;
    type ResponseData: for<'de> Deserialize<'de>;
    fn build_query(variables: Self::Variables) -> QueryBody<Self::Variables>;
}

A convenience trait that can be used to build a GraphQL request body.

This will be implemented for you by codegen in the normal case. It is implemented on the struct you place the derive on.

Example:

use graphql_client::*;
use serde_json::json;

#[derive(GraphQLQuery)]
#[graphql(
  query_path = "../graphql_client_codegen/src/tests/star_wars_query.graphql",
  schema_path = "../graphql_client_codegen/src/tests/star_wars_schema.graphql"
)]
struct StarWarsQuery;

fn main() -> Result<(), failure::Error> {
    use graphql_client::GraphQLQuery;

    let variables = star_wars_query::Variables {
        episode_for_hero: star_wars_query::Episode::NEWHOPE,
    };

    let expected_body = json!({
        "operationName": star_wars_query::OPERATION_NAME,
        "query": star_wars_query::QUERY,
        "variables": {
            "episodeForHero": "NEWHOPE"
        },
    });

    let actual_body = serde_json::to_value(
        StarWarsQuery::build_query(variables)
    )?;

    assert_eq!(actual_body, expected_body);

    Ok(())
}

Associated Types

type Variables: Serialize

The shape of the variables expected by the query. This should be a generated struct most of the time.

type ResponseData: for<'de> Deserialize<'de>

The top-level shape of the response data (the data field in the GraphQL response). In practice this should be generated, since it is hard to write by hand without error.

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Required methods

fn build_query(variables: Self::Variables) -> QueryBody<Self::Variables>

Produce a GraphQL query struct that can be JSON serialized and sent to a GraphQL API.

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Implementors

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