Don't encode HasMany or HasOne to an SQLEncoder

Author: joshuawright11

Sources/Alchemy/SQL/Rune/Model/Fields/ModelFieldReader.swift

@@ -76,6 +76,8 @@ private struct _KeyedEncodingContainer<M: Model, Key: CodingKey>: KeyedEncodingC
             return
         }
 
+        guard !(value is AnyHas) else { return }
+        
         let keyString = encoder.mappingStrategy.map(input: key.stringValue)
         guard let convertible = value as? SQLValueConvertible else {
             // Assume anything else is JSON.

Sources/Alchemy/SQL/Rune/Relationships/PropertyWrappers/HasManyRelationship.swift

@@ -47,8 +47,8 @@ public final class HasManyRelationship<From: Model, To: ModelMaybeOptional>: Any
     public init(from decoder: Decoder) throws {}
 
     public func encode(to encoder: Encoder) throws {
-        if !(encoder is SQLEncoder) {
-            try value.encode(to: encoder)
+        if !(encoder is SQLEncoder), let underlyingValue = value {
+            try underlyingValue.encode(to: encoder)
         }
     }
 }
@@ -58,12 +58,3 @@ extension HasManyRelationship: Equatable where To: Equatable {
         lhs.value == rhs.value
     }
 }
-
-public extension KeyedEncodingContainer {
-    // Only encode the underlying value if it exists.
-    mutating func encode<From, To>(_ value: HasManyRelationship<From, To>, forKey key: Key) throws {
-        if let underlyingValue = value.value {
-            try encode(underlyingValue, forKey: key)
-        }
-    }
-}

Sources/Alchemy/SQL/Rune/Relationships/PropertyWrappers/HasOneRelationship.swift

@@ -47,8 +47,8 @@ public final class HasOneRelationship<From: Model, To: ModelMaybeOptional>: AnyH
     public init(from decoder: Decoder) throws {}
 
     public func encode(to encoder: Encoder) throws {
-        if !(encoder is SQLEncoder) {
-            try value.encode(to: encoder)
+        if !(encoder is SQLEncoder), let underlyingValue = value {
+            try underlyingValue.encode(to: encoder)
         }
     }
 }
@@ -58,12 +58,3 @@ extension HasOneRelationship: Equatable where To: Equatable {
         lhs.value == rhs.value
     }
 }
-
-public extension KeyedEncodingContainer {
-    // Only encode the underlying value if it exists.
-    mutating func encode<From, To>(_ value: HasOneRelationship<From, To>, forKey key: Key) throws {
-        if let underlyingValue = value.value {
-            try encode(underlyingValue, forKey: key)
-        }
-    }
-}