45 lines
1.4 KiB
C#
45 lines
1.4 KiB
C#
using System.Reflection;
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using Newtonsoft.Json;
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using Newtonsoft.Json.Serialization;
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namespace Foxnouns.Backend.Utils;
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/// <summary>
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/// <para>A base class used for PATCH requests which stores information on whether a key is explicitly set to null or not passed at all.</para>
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/// <para>
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/// HasProperty() should not be used for properties that cannot be set to null--a null value should be treated
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/// as an unset value in those cases.
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/// </para>
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/// </summary>
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public abstract class PatchRequest
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{
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private readonly HashSet<string> _properties = [];
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public bool HasProperty(string propertyName) => _properties.Contains(propertyName);
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public void SetHasProperty(string propertyName) => _properties.Add(propertyName);
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}
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/// <summary>
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/// A custom contract resolver to reduce the boilerplate needed to use <see cref="PatchRequest" />.
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/// Based on this StackOverflow answer: https://stackoverflow.com/a/58748036
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/// </summary>
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public class PatchRequestContractResolver : DefaultContractResolver
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{
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protected override JsonProperty CreateProperty(
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MemberInfo member,
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MemberSerialization memberSerialization
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)
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{
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JsonProperty prop = base.CreateProperty(member, memberSerialization);
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prop.SetIsSpecified += (o, _) =>
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{
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if (o is not PatchRequest patchRequest)
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return;
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patchRequest.SetHasProperty(prop.UnderlyingName!);
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};
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return prop;
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}
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}
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