Gain insights into crafting GraphQL APIs with Elixir's Absinthe. Explore building schemata, securing endpoints, and integrating frontends to master creating, publishing, and utilizing robust GraphQL APIs.

Craft GraphQL APIs in Elixir with Absinthe.png

graphql.tar.gz

Chapter_2_1_start

Chapter_2_2_object_Running_GraphQLServer

Chapter_2_2_object

Chapter_3_3_matching

Chapter_3_3_matching_GraphQiL

Chapter_4_2_Union_GraphQiL

Chapter_5_2_Create

Chapter_6_4-publish

Chapter_6_4-orderingapi

Chapter_7_5-default

Chapter_8_2-login

Chapter_8_3-context

Chapter_9_dataloader

Chapter_10_Start

Chapter_10_2_action

Chapter_10_3_put

Chapter_10_4_login

Chapter_10_5_History

Chapter_11_2_subsription

Chapter_11_1_start

Chapter_11_hybird

Chapter_11_Applo_Client

Chapter_11_1_start-Updated

Chapter11-2-HTTP-Subscription

Chapter11-2-HTTP-Relay-Subscription

GraphQL is an API query language that allows clients to ask for exactly what they need and nothing more makes it easier to evolve APIs over time.

This course is divided into three parts, Part 1- Build a GraphQL API, Part 2- Publish Your API, and Part-3 Use Your API. 

In the first part, you will cover topics ranging from basic GraphQL, Building GraphQL Schema, Taking User Input, Adding Flexibility, Making a Change with Mutations, and Going Live with Subscriptions.

In the second part, you will cover topics ranging from Resolution Middleware, Securing with Authentication and Authorization, and Tuning Resolution.

The third part will cover topics ranging from Driving Phoenix Actions with GraphQL, Integrating with the Frontend and GraphQL Types. Upon completing this course, you will have sufficient foundational knowledge of GraphQL, and you can build, publish and use your API in GraphQL.

Craft GraphQL APIs in Elixir with Absinthe

# Marking arguments as non-null
Exclamation marks are  used in variable declarations to ensure that variable values are  provided:

query ($filter: MenuItemFilter!) {
   menuItems(filter: $filter) {
     name
   }
}

The document here declares that the `$filter `variable is a `MenuItemFilter`. Adding an exclamation mark denotes a mandatory value. This is a constraint that the document designer builds into the query, but the schema designer can also enforce `non_null` constraints on the backend.

Let’s say we want to ensure that a filter is always provided to the `:menu_items` field, regardless of what the document deems mandatory. We can do this by using the Absinthe `non_null` macro and wrapping the argument type:

The document here declares that the `＄filter `variable is a `MenuItemFilter`. Adding an exclamation mark denotes a mandatory value. This is a constraint that the document designer builds into the query, but the schema designer can also enforce `non_null` constraints on the backend.

Let’s say we want to ensure that a filter is always provided to the `:menu_items` field, regardless of what the document deems mandatory. We can do this by using the Absinthe `non_null` macro and wrapping the argument type:

Non-null Constraints

Getting Started

Meet GraphQL

Building Schema of GraphQL

Taking User Input

Adding Flexibility

Making a Change with Mutations

Going Live with Subscriptions

Resolution Middleware

Securing with Authentication and Authorization

Tuning Resolution

Driving Phoenix Actions with GraphQL

Integrating with the Front-end

Conclusion

Non-null Constraints

Marking arguments as non-null