Apollo Optics is now available for GraphQL requests

Optics is something we're quite pleased of, and we hope you'll check it out! In only a few minutes, you can integrate Optics to your GraphQL app. To get started, go here, or if you have any questions, join us in optics on Apollo Slack.

#graphql 

What is GEEK

Buddha Community

Apollo Optics and your GraphQL Server

As we move into a GraphQL-first world, it’s important to be able to understand not only what data you’re fetching, but also how it’s being fetched. Many people think of this as an after-thought, hoping that simply getting as much code as possible out as fast as possible will help them win over their competition.

However, this approach can be costly on many levels. First, your application’s end users will notice the clunkiness of your application. In addition, on your servers, fetching data the wrong way can create inefficiencies that cost you in CPU usage, memory leaks, and slow response times (not to mention your AWS bill skyrocketing through the roof). Not the type of growth you’re looking for, probably.

#graphql #graphql server #apollo optics

Apollo Optics is now available for GraphQL requests

Optics is something we're quite pleased of, and we hope you'll check it out! In only a few minutes, you can integrate Optics to your GraphQL app. To get started, go here, or if you have any questions, join us in optics on Apollo Slack.

#graphql 

How to Build a Modern Bookmark Manager With Angular Apollo & GraphQL

Learn how to build a full-stack web app with Angular Apollo & GraphQL using Nest.js as a backend. Automatic code generation makes creating this app a breeze.

UI Repo: https://github.com/mguay22/booker
Backend Repo: https://github.com/mguay22/booker-backend

#angular #graphql #apollo #nest #nestjs #graphql #fullstack 

How to Build Apollo GraphQL Server From Scratch

What is GraphQL

GraphQL is a query language and a server-side runtime that is used to request data from the server. The first thing that comes to mind when hearing the term “query language” is SQL. Just as SQL is used for querying databases, GraphQL is a bit like SQL but for querying web APIs as it eliminates the need to repeatedly develop or change existing end-points. GraphQL also enables the client/front-end to retrieve exactly the data they have requested and no more. This means that, within a single request of GraphQL, you can traverse from the entry point to the related data (whereas in RESTful API you have to call multiple endpoints to fetch similar results).

The following example will help you to understand this better. Let us consider an object person which has the attributes name, age, email, and contactNumber. Suppose the front-end only needs the name and age of the person. If we design a REST API, the endpoint will look like api/persons, which will end up fetching all the fields for the person object. The issue arises here because there is no easy way to communicate that I am interested in some fields and not others (which causes REST API to over fetch the data).

#graphql #nodejs #apollo-server #graphql-apollo-server

apollo-upload-client: A Terminating Apollo Link for Apollo Client that Fetches a GraphQL Multipart Request

Apollo Upload Client

A terminating Apollo Link for Apollo Client that fetches a GraphQL multipart request if the GraphQL variables contain files (by default FileList, File, Blob, or ReactNativeFile instances), or else fetches a regular GraphQL POST or GET request (depending on the config and GraphQL operation).

Installation

To install with npm, run:

npm install apollo-upload-client

Remove any uri, credentials, or headers options from the ApolloClient constructor.

Apollo Client can only have 1 terminating Apollo Link that sends the GraphQL requests; if one such as HttpLink is already setup, remove it.

Initialize the client with a terminating Apollo Link using createUploadLink.

Also ensure the GraphQL server implements the GraphQL multipart request spec and that uploads are handled correctly in resolvers.

Usage

Use FileList, File, Blob or ReactNativeFile instances anywhere within query or mutation variables to send a GraphQL multipart request.

See also the example API and client.

FileList

import { gql, useMutation } from "@apollo/client";

const MUTATION = gql`
  mutation ($files: [Upload!]!) {
    uploadFiles(files: $files) {
      success
    }
  }
`;

function UploadFiles() {
  const [mutate] = useMutation(MUTATION);

  function onChange({ target: { validity, files } }) {
    if (validity.valid) mutate({ variables: { files } });
  }

  return <input type="file" multiple required onChange={onChange} />;
}

File

import { gql, useMutation } from "@apollo/client";

const MUTATION = gql`
  mutation ($file: Upload!) {
    uploadFile(file: $file) {
      success
    }
  }
`;

function UploadFile() {
  const [mutate] = useMutation(MUTATION);

  function onChange({
    target: {
      validity,
      files: [file],
    },
  }) {
    if (validity.valid) mutate({ variables: { file } });
  }

  return <input type="file" required onChange={onChange} />;
}

Blob

import { gql, useMutation } from "@apollo/client";

const MUTATION = gql`
  mutation ($file: Upload!) {
    uploadFile(file: $file) {
      success
    }
  }
`;

function UploadFile() {
  const [mutate] = useMutation(MUTATION);

  function onChange({ target: { validity, value } }) {
    if (validity.valid) {
      const file = new Blob([value], { type: "text/plain" });

      // Optional, defaults to `blob`.
      file.name = "text.txt";

      mutate({ variables: { file } });
    }
  }

  return <input type="text" required onChange={onChange} />;
}

Requirements

• Node.js: ^12.22.0 || ^14.17.0 || >= 16.0.0
• Browsers: > 0.5%, not OperaMini all, not IE > 0, not dead
• React Native

Consider polyfilling:

• Promise
• fetch
• FormData

API

• class ReactNativeFile
• function createUploadLink
• function formDataAppendFile
• function isExtractableFile
• type ExtractableFileMatcher
• type FetchOptions
• type FormDataFileAppender
• type ReactNativeFileSubstitute

class ReactNativeFile

Used to mark React Native File substitutes as it’s too risky to assume all objects with uri, type and name properties are extractable files.

Parameter	Type	Description
file	ReactNativeFileSubstitute	A React Native File substitute.

See

• extract-files ReactNativeFile docs.

Examples

Ways to import.

import { ReactNativeFile } from "apollo-upload-client";

import ReactNativeFile from "apollo-upload-client/public/ReactNativeFile.js";

Ways to require.

const { ReactNativeFile } = require("apollo-upload-client");

const ReactNativeFile = require("apollo-upload-client/public/ReactNativeFile.js");

A file in React Native that can be used in query or mutation variables.

const file = new ReactNativeFile({  uri: uriFromCameraRoll,  name: "a.jpg",  type: "image/jpeg", });

---

function createUploadLink

Creates a terminating Apollo Link for Apollo Client that fetches a GraphQL multipart request if the GraphQL variables contain files (by default FileList, File, Blob, or ReactNativeFile instances), or else fetches a regular GraphQL POST or GET request (depending on the config and GraphQL operation).

Some of the options are similar to the createHttpLink options.

Parameter	Type	Description
options	object	Options.
options.uri	string? = /graphql	GraphQL endpoint URI.
options.useGETForQueries	boolean?	Should GET be used to fetch queries, if there are no files to upload.
options.isExtractableFile	ExtractableFileMatcher? = isExtractableFile	Customizes how files are matched in the GraphQL operation for extraction.
options.FormData	class?	FormData implementation to use, defaulting to the FormData global.
options.formDataAppendFile	FormDataFileAppender? = formDataAppendFile	Customizes how extracted files are appended to the FormData instance.
options.fetch	Function?	fetch implementation to use, defaulting to the fetch global.
options.fetchOptions	FetchOptions?	fetch options; overridden by upload requirements.
options.credentials	string?	Overrides options.fetchOptions.credentials.
options.headers	object?	Merges with and overrides options.fetchOptions.headers.
options.includeExtensions	boolean? = false	Toggles sending extensions fields to the GraphQL server.

Returns: ApolloLink — A terminating Apollo Link.

See

• GraphQL multipart request spec.

Examples

Ways to import.

import { createUploadLink } from "apollo-upload-client";

import createUploadLink from "apollo-upload-client/public/createUploadLink.js";

Ways to require.

const { createUploadLink } = require("apollo-upload-client");

const createUploadLink = require("apollo-upload-client/public/createUploadLink.js");

A basic Apollo Client setup.

import { ApolloClient, InMemoryCache } from "@apollo/client"; import createUploadLink from "apollo-upload-client/public/createUploadLink.js"; const client = new ApolloClient({  cache: new InMemoryCache(),  link: createUploadLink(), });

---

function formDataAppendFile

The default implementation for createUploadLink options.formDataAppendFile that uses the standard FormData.append method.

Type: FormDataFileAppender

Parameter	Type	Description
formData	FormData	FormData instance to append the specified file to.
fieldName	string	Field name for the file.
file	*	File to append.

Examples

Ways to import.

import { formDataAppendFile } from "apollo-upload-client";

import formDataAppendFile from "apollo-upload-client/public/formDataAppendFile.js";

Ways to require.

const { formDataAppendFile } = require("apollo-upload-client");

const formDataAppendFile = require("apollo-upload-client/public/formDataAppendFile.js");

---

function isExtractableFile

The default implementation for createUploadLink options.isExtractableFile.

Type: ExtractableFileMatcher

Parameter	Type	Description
value	*	Value to check.

Returns: boolean — Is the value an extractable file.

See

• extract-files isExtractableFile docs.

Examples

Ways to import.

import { isExtractableFile } from "apollo-upload-client";

import isExtractableFile from "apollo-upload-client/public/isExtractableFile.js";

Ways to require.

const { isExtractableFile } = require("apollo-upload-client");

const isExtractableFile = require("apollo-upload-client/public/isExtractableFile.js");

---

type ExtractableFileMatcher

A function that checks if a value is an extractable file.

Type: Function

Parameter	Type	Description
value	*	Value to check.

Returns: boolean — Is the value an extractable file.

See

• isExtractableFile has this type.

Examples

How to check for the default exactable files, as well as a custom type of file.

import isExtractableFile from "apollo-upload-client/public/isExtractableFile.js"; const isExtractableFileEnhanced = (value) =>  isExtractableFile(value) ||  (typeof CustomFile !== "undefined" && value instanceof CustomFile);

---

type FetchOptions

GraphQL request fetch options.

Type: object

Property	Type	Description
headers	object	HTTP request headers.
credentials	string?	Authentication credentials mode.

See

• Polyfillable fetch options.

---

type FormDataFileAppender

Appends a file extracted from the GraphQL operation to the FormData instance used as the fetch options.body for the GraphQL multipart request.

Parameter	Type	Description
formData	FormData	FormData instance to append the specified file to.
fieldName	string	Field name for the file.
file	*	File to append. The file type depends on what the ExtractableFileMatcher extracts.

See

• formDataAppendFile has this type.
• createUploadLink accepts this type in options.formDataAppendFile.

---

type ReactNativeFileSubstitute

A React Native File substitute.

Be aware that inspecting network traffic with buggy versions of dev tools such as Flipper can interfere with the React Native FormData implementation, causing multipart requests to have network errors.

Type: object

Property	Type	Description
uri	string	Filesystem path.
name	string?	File name.
type	string?	File content type. Some environments (particularly Android) require a valid MIME type; Expo ImageResult.type is unreliable as it can be just image.

See

• extract-files ReactNativeFileSubstitute docs.
• React Native FormData polyfill source.

Examples

A camera roll file.

const fileSubstitute = {  uri: uriFromCameraRoll,  name: "a.jpg",  type: "image/jpeg", };

Download Details: 
Author: jaydenseric
Source Code: https://github.com/jaydenseric/apollo-upload-client 
License: MIT
#apollo #graphql