ra-data-hasura-graphql

A GraphQL data provider for react-admin tailored to target Hasura GraphQL endpoints.

• Installation
• Usage
• Options

Example application demonstrating usage: react-admin-low-code

Benifits and Motivation

This utility is built on top of ra-data-graphql and is a custom data provider for the current Hasura graphql API format.

The existing ra-data-hasura provider communicates with Hasura V1, using standard REST and not GraphQL. The existing ra-data-graphql-simple provider, requires that your graphql endpoint implement a specific grammar for the objects and methods exposed, which is not an option available if you intend to use a Hasura API because the exposed objects and methods are generated to match their own specification.

This utility auto generates valid graphql queries based on the properties exposed by the Hasura API such as object_bool_exp and object_set_input.

Installation

Install with:

npm install --save graphql ra-data-hasura-graphql

Usage

The ra-data-hasura-graphql package exposes a single function, which is a constructor for a dataProvider based on a Hasura GraphQL endpoint. When executed, this function calls the endpoint, running an introspection query to learn about the specific data models exposed by your Hasura endpoint. It uses the result of this query (the GraphQL schema) to automatically configure the dataProvider accordingly.

// in App.js
import React, { Component } from 'react';
import buildHasuraProvider from 'ra-data-hasura-graphql';
import { Admin, Resource } from 'react-admin';

import { PostCreate, PostEdit, PostList } from './posts';

class App extends Component {
    constructor() {
        super();
        this.state = { dataProvider: null };
    }
    componentDidMount() {
        buildHasuraProvider({ clientOptions: { uri: 'http://localhost:4000' }})
            .then(dataProvider => this.setState({ dataProvider }));
    }

    render() {
        const { dataProvider } = this.state;

        if (!dataProvider) {
            return <div>Loading</div>;
        }

        return (
            <Admin dataProvider={dataProvider}>
                <Resource name="Post" list={PostList} edit={PostEdit} create={PostCreate} />
            </Admin>
        );
    }
}

export default App;

The adapter generates queries based on the standard API's and query arguments generated by Hasura. For example, a GET_LIST request for a person resource, with the parameters :

{
  "pagination": {"page": 1, "perPage": 5},
  "sort": {"field": "name", "order": "DESC"},
  "filter": {"ids": [
  "f10b7d4b-72a2-4cca-a978-55577e3ef35c",
  "fe7470ae-2626-48c7-80dc-1726c066ce4d"
  ]}
}

Generates the following graphql request for Hasura :

query person($limit: Int, $offset: Int, $order_by: [person_order_by!]!, $where: person_bool_exp) {
  items: person(limit: $limit, offset: $offset, order_by: $order_by, where: $where) {
    address_id
    id
    name
  }
  total: person_aggregate(limit: $limit, offset: $offset, order_by: $order_by, where: $where) {
    aggregate {
      count
    }
  }
}

And generates the following variables to be passed along side the query:
{
  limit: 5,
  offset: 0,
  order_by: { name: 'desc' },
  where: {
    _and: [
      {
        id: {
          _in: ['f10b7d4b-72a2-4cca-a978-55577e3ef35c','fe7470ae-2626-48c7-80dc-1726c066ce4d']
        }
      }
    ]
  }
}

Sorting

Dot notation is supported for sort fields, and will be expanded into an object in the graphQL query.

For example:

export const PostList = (props) => (
    <List {...props} sort={{ field: 'user.email', order: 'DESC' }}>
        ...
    </List>
);

Will generate the following graphQL query:

{
  limit: 25,
  offset: 0,
  order_by: { user: { email: 'desc' } }
}

Options

Customize the Apollo client

You can either supply the client options by calling buildGraphQLProvider like this:

buildGraphQLProvider({ clientOptions: { uri: 'http://localhost:4000', ...otherApolloOptions } });

Or supply your client directly with:

buildGraphQLProvider({ client: myClient });

Customize the introspection

These are the default options for introspection:

const introspectionOptions = {
    include: [], // Either an array of types to include or a function which will be called for every type discovered through introspection
    exclude: [], // Either an array of types to exclude or a function which will be called for every type discovered through introspection
};

// Including types
const introspectionOptions = {
    include: ['Post', 'Comment'],
};

// Excluding types
const introspectionOptions = {
    exclude: ['CommandItem'],
};

// Including types with a function
const introspectionOptions = {
    include: type => ['Post', 'Comment'].includes(type.name),
};

// Including types with a function
const introspectionOptions = {
    exclude: type => !['Post', 'Comment'].includes(type.name),
};

Note: exclude and include are mutually exclusives and include will take precendance.

Note: When using functions, the type argument will be a type returned by the introspection query. Refer to the introspection documentation for more information.

Pass the introspection options to the buildApolloProvider function:

buildApolloProvider({ introspection: introspectionOptions });

Customize fields, variables, responseParser

Using the factories you can customize the behavior of the data provider.

Just change the buildQuery property in the options object:

import buildDataProvider from 'ra-data-hasura-graphql'
import { buildQueryFactory } from 'ra-data-hasura-graphql/src/buildQuery'
import buildVariables from 'ra-data-hasura-graphql/src/buildVariables'
import { buildGqlQuery, buildFields, buildMetaArgs, buildArgs, buildApolloArgs } from 'ra-data-hasura-graphql/src/buildGqlQuery'
import getResponseParser from 'ra-data-hasura-graphql/src/getResponseParser'

const buildGqlQueryCustom = iR => buildGqlQuery(iR, buildFields, buildMetaArgs, buildArgs, buildApolloArgs)
const buildQuery = buildQueryFactory(buildVariables, buildGqlQueryCustom, getResponseParser)
buildDataProvider({...opt, buildQuery})

Example: Query related entities

import buildDataProvider from 'ra-data-hasura-graphql'
import { buildQueryFactory } from 'ra-data-hasura-graphql/src/buildQuery'
import buildVariables from 'ra-data-hasura-graphql/src/buildVariables'
import { buildGqlQuery, buildFields, buildMetaArgs, buildArgs, buildApolloArgs } from 'ra-data-hasura-graphql/src/buildGqlQuery'
import getResponseParser from 'ra-data-hasura-graphql/src/getResponseParser'
import * as gqlTypes from 'graphql-ast-types-browser';

const buildFieldsCustom = type => {
  let res = buildFields(type)
  if(type.name === "app") {
    // here we add additional fields we want to query for apps.
    // we are using the graphql-ast-types functions which is ast representation for graphql
    res.push(gqlTypes.field(gqlTypes.name("app_berechtigungs"), null, null, null, gqlTypes.selectionSet([
      gqlTypes.field(gqlTypes.name("berechtigung_id")),
      gqlTypes.field(gqlTypes.name("berechtigung"), null, null, null, gqlTypes.selectionSet([
        gqlTypes.field(gqlTypes.name("name"))
      ]))
    ])))
  }
  return res
}
const buildGqlQueryCustom = iR => buildGqlQuery(iR, buildFieldsCustom, buildMetaArgs, buildArgs, buildApolloArgs)
const buildQuery = buildQueryFactory(buildVariables, buildGqlQueryCustom, getResponseParser)
buildDataProvider({buildQuery})

This should add the relation to the GraphQL query and result in a query similar to:

app {
  id
  name
  app_berechtigungs {
    berechtigung_id
    berechtigung {
      name
    }
  }
}