Text exercises: **Breaking** Add participation in text exercises (#39)

* **Breaking**: Fix typo

* Encode submissionExerciseType

14:29:19.089 ❤️ ERROR EditTextExerciseViewModel.submit():86 - jhipsterError(
    error: Common.UserFacingError(
        title: "Bad Request", status: Optional(400),
        detail: Optional("JSON parse error: Could not resolve subtype of [simple type, class de.tum.in.www1.artemis.domain.TextSubmission]: missing type id property \'submissionExerciseType\'"),
        message: Optional("error.http.400"),
        path: Optional("/api/exercises/137/text-submissions"),
        code: nil,
        type: Optional(https://www.jhipster.tech/problem/problem-with-message)))

Author: nityanandaz

Sources/SharedModels/Exercise/Participation/BaseParticipation.swift

@@ -59,7 +59,7 @@ public enum Participation: Identifiable, Codable {
 }
 
 public enum InitializationState: String, Codable {
-    case uninitalized = "UNINITIALIZED"
+    case uninitialized = "UNINITIALIZED"
     case repoCopied = "REPO_COPIED"
     case repoConfigured = "REPO_CONFIGURED"
     case buildPlanCopied = "BUILD_PLAN_COPIED"

Sources/SharedModels/Exercise/Submission/TextSubmission.swift

@@ -25,6 +25,48 @@ public struct TextSubmission: BaseSubmission {
     public var blocks: [TextBlock]?
 }
 
+public extension TextSubmission {
+    private enum CodingKeys: String, CodingKey {
+        case type = "submissionExerciseType"
+        case id
+        case submitted
+        case submissionDate
+        case exampleSubmission
+        case durationInMinutes
+        case results
+        case participation
+        case text
+        case blocks
+    }
+
+    init(from decoder: Decoder) throws {
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        id = try container.decodeIfPresent(Int.self, forKey: .id)
+        submitted = try container.decodeIfPresent(Bool.self, forKey: .submitted)
+        submissionDate = try container.decodeIfPresent(Date.self, forKey: .submissionDate)
+        exampleSubmission = try container.decodeIfPresent(Bool.self, forKey: .exampleSubmission)
+        durationInMinutes = try container.decodeIfPresent(Double.self, forKey: .durationInMinutes)
+        results = try container.decodeIfPresent([Result?].self, forKey: .results)
+        participation = try container.decodeIfPresent(Participation.self, forKey: .participation)
+        text = try container.decodeIfPresent(String.self, forKey: .text)
+        blocks = try container.decodeIfPresent([TextBlock].self, forKey: .blocks)
+    }
+
+    public func encode(to encoder: Encoder) throws {
+        var container = encoder.container(keyedBy: CodingKeys.self)
+        try container.encode(Self.type, forKey: .type)
+        try container.encode(id, forKey: .id)
+        try container.encode(submitted, forKey: .submitted)
+        try container.encode(submissionDate, forKey: .submissionDate)
+        try container.encode(exampleSubmission, forKey: .exampleSubmission)
+        try container.encode(durationInMinutes, forKey: .durationInMinutes)
+        try container.encode(results, forKey: .results)
+        try container.encode(participation, forKey: .participation)
+        try container.encode(text, forKey: .text)
+        try container.encode(blocks, forKey: .blocks)
+    }
+}
+
 public struct TextBlock: Codable {
     public var id: String?
     public var text: String?