Add RequestBody typealias (#33)

Sources/Request/Request/RequestParams/Body.swift

@@ -24,6 +24,14 @@ import Foundation
 ///         Url("api.example.com/save")
 ///         Body("myData")
 ///     }
+///
+/// Or as an `Encodable` type:
+///
+///     Request {
+///         Url("api.example.com/save")
+///         Body(codableTodo)
+///     }
+///
 public struct Body: RequestParam {
     public var type: RequestParamType = .body
     public var value: Any?
@@ -33,8 +41,17 @@ public struct Body: RequestParam {
         self.value = try? JSONSerialization.data(withJSONObject: dict, options: .prettyPrinted)
     }
 
+    /// Creates the `Body` from an `Encodable` type using `JSONEncoder`
+    public init<T: Encodable>(_ value: T) {
+        self.value = try? JSONEncoder().encode(value)
+    }
+
     /// Creates the `Body` from a `String`
     public init(_ string: String) {
         self.value = string.data(using: .utf8)
     }
 }
+
+#if canImport(SwiftUI)
+public typealias RequestBody = Body
+#endif

Tests/RequestTests/RequestTests.swift

@@ -43,17 +43,25 @@ final class RequestTests: XCTestCase {
     }
 
     func testPost() {
-        // Workaround for 'ambiguous reference' error.
-        let method = Method(.post)
+        struct Todo: Codable {
+            let title: String
+            let completed: Bool
+            let userId: Int
+        }
         performRequest(Request {
             Url("https://jsonplaceholder.typicode.com/todos")
-            method
+            Method(.post)
             Body([
                 "title": "My Post",
                 "completed": true,
                 "userId": 3,
             ])
             Body("{\"userId\" : 3,\"title\" : \"My Post\",\"completed\" : true}")
+            RequestBody(Todo(
+                title: "My Post",
+                completed: true,
+                userId: 3
+            ))
         })
     }