diff --git a/README.md b/README.md
index f21d7f1..f64fb2e 100644
--- a/README.md
+++ b/README.md
@@ -4,12 +4,14 @@
[](https://beerpay.io/trevorblades/countries)
-A public GraphQL API for information about countries, continents, and languages. This project uses [Countries List](https://annexare.github.io/Countries/) as a data source, so the schema follows the shape of that data, with a couple exceptions:
+A public GraphQL API for information about countries, continents, and languages. This project uses [Countries List](https://annexare.github.io/Countries/) as a data source, so the schema follows the shape of that data, with a few exceptions:
1. The codes used to key the objects in the original data are available as a `code` property on each item returned from the API.
2. The `continent` and `languages` properties are now objects and arrays of objects, respectively.
-## Writing queries
+## Querying
+
+In:
```graphql
{
@@ -26,6 +28,8 @@ A public GraphQL API for information about countries, continents, and languages.
}
```
+Out:
+
```json
{
"data": {
@@ -45,30 +49,38 @@ A public GraphQL API for information about countries, continents, and languages.
}
```
-Check out the [playground](https://countries.trevorblades.com) to explore the schema and test out some queries.
+Check out [the playground](https://countries.trevorblades.com) to explore the schema and test out some queries.
## Example
-A practical use of this API is to create a country select input that doesn't require you to include a large dataset of country info in your bundle.
+One practical use of this API is to create a country select field that fetches its options dynamically. Normally, you would need to install an npm package or create a file in your project containing the necessary data -- usually country codes and names -- and bundle that data with your app code. This results in a lot of extra kilobytes hanging around in your bundle for a feature that might not always get rendered or used. Here's what that data size looks like:
-In this example, we'll be using [React](https://reactjs.org/) and the [Apollo](https://apollographql.com) GraphQL client. First, we'll install all of our dependencies:
+- **50.1 KB** using the `countries` export from [Countries List](https://annexare.github.io/Countries/)
+- **14.2 KB** using this API (~70% smaller)
+
+In this example, I'll be using [React](https://reactjs.org/) and some [Apollo](https://apollographql.com) tools. Apollo's GraphQL client and React components make it simple to execute, handle, and cache GraphQL queries. You can also accomplish this by sending a POST request to this API using `fetch` or your favourite request library, but I won't cover that in this example.
+
+### Install dependencies
```shell
$ npm install react react-dom react-apollo apollo-boost graphql graphql-tag
```
-50.1 KB with `countries-list`
-14.2 KB with Countries GraphQL
+### Build a React component
```js
-import React from 'react';
-import ReactDOM from 'react-dom';
import ApolloClient from 'apollo-boost';
+import React, {Component} from 'react';
+import ReactDOM from 'react-dom';
+import gql from 'graphql-tag';
+import {Query} from 'react-apollo';
+// initialize our Apollo GraphQL client
const client = new ApolloClient({
uri: 'https://countries.trevorblades.com'
});
+// write a GraphQL query that asks for names and codes for all countries
const GET_COUNTRIES = gql`
{
countries {
@@ -79,38 +91,45 @@ const GET_COUNTRIES = gql`
`;
class App extends Component {
- state = {
- country: ''
- };
+ constructor(props) {
+ super(props);
- onCountryChange = event =>
+ // set a default value
+ this.state = {
+ country: 'US'
+ };
+ }
+
+ // set the selected country to the new input value
+ onCountryChange(event) {
this.setState({country: event.target.value});
+ }
render() {
return (
-
-
- {({loading, error, data}) => {
- if (loading) return