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decodeIfPresent if nil

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This commit is contained in:
panxi 2019-12-13 15:05:07 -05:00
parent 12e06894de
commit 5d836fc757
1 changed files with 7 additions and 3 deletions
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10
MVMCore/MVMCore/Models/Model/ModelRegistry.swift
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@ -45,10 +45,14 @@ extension KeyedDecodingContainer where Key: CodingKey {
//MARK: - DecodeIfPresent //MARK: - DecodeIfPresent
public func decodeIfPresent<T, C:CodingKey>(codingKey: KeyedDecodingContainer<K>.Key, typeCodingKey: C) throws -> T? { public func decodeIfPresent<T, C:CodingKey>(codingKey: KeyedDecodingContainer<K>.Key, typeCodingKey: C) throws -> T? {
//get the type string //get the type string
let meta = try self.nestedContainer(keyedBy: C.self, forKey: codingKey) var me: KeyedDecodingContainer<C>?
guard let type = try meta.decodeIfPresent(String.self, forKey: typeCodingKey) else { do {
me = try self.nestedContainer(keyedBy: C.self, forKey: codingKey)
} catch {
return nil
}
guard let type = try me?.decodeIfPresent(String.self, forKey: typeCodingKey) else {
return nil return nil
} }