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provider "aws" {
  region     = "${var.region}"
}
### VPC

# Fetch AZs in the current region
data "aws_availability_zones" "available" {}

resource "aws_vpc" "datastore" {
  cidr_block = "172.17.0.0/16"

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query {
  users {
    firstName
  }
}

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-- AST1
data ColExpression = ColE ColName [OperationExpression]

data BoolExpression = BECol ColExpression

data BoolExpression
  = BEAnd [BoolExpression]
  | BEOr [BoolExpression]
  | BENot BoolExpression
  | BECol ColExpression

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// Boolean expression for a column
"column": {
  "_eq": "value",
  "_gt": "value"
}


// AND expression
"and": {
  "column1": {...},

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#Query running against data the DB
query {
  albums {
    id
    title
  }
}

#Query running against your own code that may or may not talk to the database
#These APIs are hosted at: https://graphql-pokemon.now.sh

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query fetchOrders {
  order (limit: 10, order_by:created_at_desc) {
    id
    user_name
    items {
      detail {
        id
        name
      }
    }

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Before	After
App makes an API request and waits.	App makes a GraphQL mutation and then runs a GraphQL subscription to get updates as they happen
Backend API makes multiple API calls, with complex retry and error handling logic	Business logic in serverless functions get triggered automatically after the mutation
App receives API response	App gets success/error updates as they happen

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Requirements

• You have an existing Hasura project, cluster
• You have a microservice running where you can add a webhook
• You have kubectl installed. Check by running: kubectl get pods -n hasura which should list all the hasura microservices

Step 1: Update the platform to v0.15.34+

Check your platform version:

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#An array of artists are returned by a GET query to /v1/artists
# artists = [
#   {
#     "name": "...",
#     "genre": "...",
#     "albums_recorded": <int>,
#     "username": "..."
#   }
# ]
#

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{
  "query": "read",
  "node": "author",
  "columns": [
      "id",
      "name",
      {
          "node": "articles",
          "columns": ["id", "title"]
      }