Chester

All details about original Chester here. In this fork, I will change some pieces of code for my job. Seems to be our API team uses another specification of GraphQL (php) 🤷🏻‍♂️

Added ability build query without fields. It just can be a subQuery:

let client = try QueryBuilder().from("client").with(fields: "cid")
let registrationQuery = try QueryBuilder()
	.from("registration")
	.with(Argument(key: "name", value: "iPhone 8"))
	.with(subQuery: client)
	.build()
print(registrationQuery)

{
  registration(name: "iPhone 8") {
    client {
      cid
    }
  }
}

Added ability use on without fields:

let accounts = QueryBuilder().from("accounts").on("currency", "value")
let accountsQuery = try QueryBuilder()
	.from("list")
	.with(Argument(key: "cid", value: 1))
	.with(subQuery: accounts)
	.build()
print(accountsQuery)

{
  list(cid: 1) {
    accounts {
      ... on currency, 
      ... on value
    }
  }
}

Added extension for flattening query string. Example for code above:

print(registrationQuery.flatQuery)
print(accountsQuery.flatQuery)

{registration(name: "iPhone 8") {client {cid}}}
{list(cid: 1) {accounts {... on currency, ... on value}}}

Changed some syntax (hide external arguments name, ability to pass array as alternative for variadic functions, etc).