Pedro Posts - Answer Overflow

Pedro

•Created by Pedro on 8/28/2023 in #help

❔ problem with DateTime format

guys, the "[DisplayFormat(DataFormatString = "{dd/MM/yyyy}")]" is not working for me: when i add an event or update it, still shows like this { "title": "string", "description": "string", "date": "2023-08-28T22:43:42.452Z", "attendees": [ "string" ] } can somebody help me?

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Net;
using System.Text.Json.Serialization;
using Microsoft.AspNetCore.Identity;



namespace EventEnroll.Models
{
    public class Event
    {
        [Key]
        public int EventId { get; set; }
        [Required]
        [MinLength(8, ErrorMessage = "Title must be at least 8 characters.")]
        public string Title { get; set; } = string.Empty;

        [MaxLength(50, ErrorMessage = "Description cannot exceed 50 characters.")]
        public string Description { get; set; } = string.Empty;

        [Required]
        [DisplayFormat(DataFormatString = "{dd/MM/yyyy}")]
        public DateTime Date { get; set; }
        public string? CreatorId { get; set; }
        [ForeignKey("CreatorId")]
        public IdentityUser? Creator { get; set; }
        // Navigation properties
        public ICollection<IdentityUser>? Attendees { get; set; } = new List<IdentityUser>();

    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Net;
using System.Text.Json.Serialization;
using Microsoft.AspNetCore.Identity;



namespace EventEnroll.Models
{
    public class Event
    {
        [Key]
        public int EventId { get; set; }
        [Required]
        [MinLength(8, ErrorMessage = "Title must be at least 8 characters.")]
        public string Title { get; set; } = string.Empty;

        [MaxLength(50, ErrorMessage = "Description cannot exceed 50 characters.")]
        public string Description { get; set; } = string.Empty;

        [Required]
        [DisplayFormat(DataFormatString = "{dd/MM/yyyy}")]
        public DateTime Date { get; set; }
        public string? CreatorId { get; set; }
        [ForeignKey("CreatorId")]
        public IdentityUser? Creator { get; set; }
        // Navigation properties
        public ICollection<IdentityUser>? Attendees { get; set; } = new List<IdentityUser>();

    }
}

42 replies

CC#

•Created by Pedro on 8/25/2023 in #help

❔ EntityFramework help determining relationship

System.InvalidOperationException: Unable to determine the relationship represented by navigation 'Event.Planner' of type 'User'. Either manually configure the relationship, or ignore this property using the '[NotMapped]' attribute or by using 'EntityTypeBuilder.Ignore' in 'OnModelCreating'. User.cs

using Microsoft.AspNetCore.Identity;

namespace EventEnroll.Models
{
    public class User : IdentityUser
    {
        public List<Event> Events { get; set; } = new List<Event>();
    }
}

using Microsoft.AspNetCore.Identity;

namespace EventEnroll.Models
{
    public class User : IdentityUser
    {
        public List<Event> Events { get; set; } = new List<Event>();
    }
}

Event.cs

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using Microsoft.AspNetCore.Identity;

namespace EventEnroll.Models
{
    public class Event
    {
        public int Id { get; set; }

        [Required]
        [MinLength(8, ErrorMessage = "Title must be at least 8 characters.")]
        public string Title { get; set; } = string.Empty;

        [MaxLength(50, ErrorMessage = "Description cannot exceed 50 characters.")]
        public string Description { get; set; } = string.Empty;

        [Required]
        [DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}")]
        public DateTime Date { get; set; }

        [Required(ErrorMessage = "Planner is required.")]
        public User Planner { get; set; }

        [Required(ErrorMessage = "At least one participant is required.")]
        public List<User> Users { get; set; }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using Microsoft.AspNetCore.Identity;

namespace EventEnroll.Models
{
    public class Event
    {
        public int Id { get; set; }

        [Required]
        [MinLength(8, ErrorMessage = "Title must be at least 8 characters.")]
        public string Title { get; set; } = string.Empty;

        [MaxLength(50, ErrorMessage = "Description cannot exceed 50 characters.")]
        public string Description { get; set; } = string.Empty;

        [Required]
        [DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}")]
        public DateTime Date { get; set; }

        [Required(ErrorMessage = "Planner is required.")]
        public User Planner { get; set; }

        [Required(ErrorMessage = "At least one participant is required.")]
        public List<User> Users { get; set; }
    }
}

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