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ModelStateExtensions.cs

using Microsoft.AspNetCore.Mvc.ModelBinding;

namespace Nop.Web.Framework.Mvc.ModelBinding;

/// <summary>
/// ModelState extensions
/// </summary>
public static class ModelStateExtensions
{
    private static Dictionary<string, object> SerializeModelState(ModelStateEntry modelState)
    {
        var errors = new List<string>();
        for (var i = 0; i < modelState.Errors.Count; i++)
        {
            var modelError = modelState.Errors[i];

            if (!string.IsNullOrEmpty(modelError.ErrorMessage))
            {
                errors.Add(modelError.ErrorMessage);
            }
        }

        var dictionary = new Dictionary<string, object>
        {
            ["errors"] = errors.ToArray()
        };
        return dictionary;
    }

    /// <summary>
    /// Serialize errors
    /// </summary>
    /// <param name="modelStateDictionary">ModelStateDictionary</param>
    /// <returns>Result</returns>
    public static object SerializeErrors(this ModelStateDictionary modelStateDictionary)
    {
        return modelStateDictionary.Where(entry => entry.Value.Errors.Any())
            .ToDictionary(entry => entry.Key, entry => SerializeModelState(entry.Value));
    }
}