support encoding arrays other than json (#172)

* support encoding arrays other than json

* simplify decoder method

* test fluent on 5.2

Author: tanner0101

.github/workflows/test.yml

@@ -36,7 +36,7 @@ jobs:
     - run: swift test --enable-test-discovery --sanitize=thread
   fluent:
     container: 
-      image: vapor/swift:5.1
+      image: vapor/swift:5.2
     services:
       psql:
         image: postgres

Sources/PostgresKit/PostgresDataDecoder.swift

@@ -56,7 +56,6 @@ public final class PostgresDataDecoder {
         }
 
         func unkeyedContainer() throws -> UnkeyedDecodingContainer {
-            print(self.data.type)
             guard let data = self.data.array else {
                 throw Error.unexpectedDataType(self.data.type, expected: "array")
             }
@@ -108,15 +107,7 @@ public final class PostgresDataDecoder {
         mutating func decode<T>(_ type: T.Type) throws -> T where T : Decodable {
             defer { self.currentIndex += 1 }
             let data = self.data[self.currentIndex]
-            let jsonData: Data
-            if let jsonb = data.jsonb {
-                jsonData = jsonb
-            } else if let json = data.json {
-                jsonData = json
-            } else {
-                throw Error.unexpectedDataType(data.type, expected: "json")
-            }
-            return try self.json.decode(T.self, from: jsonData)
+            return try PostgresDataDecoder(json: self.json).decode(T.self, from: data)
         }
 
         mutating func nestedContainer<NestedKey>(

Sources/PostgresKit/PostgresDataEncoder.swift

@@ -8,15 +8,17 @@ public final class PostgresDataEncoder {
     }
 
     public func encode(_ value: Encodable) throws -> PostgresData {
-        if let custom = value as? PostgresDataConvertible {
-            return custom.postgresData!
+        if let custom = value as? PostgresDataConvertible, let data = custom.postgresData {
+            return data
         } else {
             let context = _Context()
             try value.encode(to: _Encoder(context: context))
             if let value = context.value {
                 return value
             } else if let array = context.array {
-                return PostgresData(array: array, elementType: .jsonb)
+                let elementType = array.first?.type ?? .jsonb
+                assert(array.filter { $0.type != elementType }.isEmpty, "Array does not contain all: \(elementType)")
+                return PostgresData(array: array, elementType: elementType)
             } else {
                 return try PostgresData(jsonb: self.json.encode(_Wrapper(value)))
             }