![](/img/trans.png)
[英]How to get grand parent Object ID for a child in Agile Central API
[英]How to get ID from parent object inside child object when creating it? (MVC)
概觀
我正在將ASP.NET Core與MVC結合使用。
我正在嘗試制作一個簡單的幫助台系統作為實驗。
它有2個對象,一個查詢和一個注釋 。
查詢包含評論列表。
注釋具有其所屬查詢的ID。
我的問題是
如何獲取要添加到評論屬性中的查詢ID(是正在創建的評論的父級)?
代碼示例
CommentsController.Create
我嘗試了2個POST示例,似乎都從注釋中捕獲了表單數據,但是我不知道如何在該表單數據中引入查詢ID。 當我創建孩子評論時。 查詢ID已添加到我發送到“創建”視圖的模型中,但在該視圖中提交表單時丟失了。 GET示例按預期工作。
// GET: Comments/Create
public IActionResult Create([FromRoute] int id) //id = InquiryID
// POST: Comments/Create
public async Task<IActionResult> Create(CommentCreationDTO commentCreationDTO)
public async Task<IActionResult> Create([FromForm]CommentCreationDTO commentCreationDTO)
查看/評論/ Create.cshtml
@model HelpDesk2018.Models.CommentCreationDTO
@{
ViewData["Title"] = "Create";
}
<h2>Create</h2>
<h4>Comment</h4>
<hr/>
<div class="row">
<div class="col-md-4">
<form asp-controller="Comments" asp-action="Create" method="post">
<div asp-validation-summary="ModelOnly" class="text-danger"></div>
<div class="form-group">
<label asp-for="@Model.Comment.TimePosted" class="control-label"></label>
<input asp-for="@Model.Comment.TimePosted" class="form-control" />
<span asp-validation-for="@Model.Comment.TimePosted" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="@Model.Comment.Text" class="control-label"></label>
<input asp-for="@Model.Comment.Text" class="form-control" />
<span asp-validation-for="@Model.Comment.Text" class="text-danger"></span>
</div>
</form>
</div>
詳細說明MVC程序中的當前流程,以更好地理解
要將注釋添加到查詢中,我進行了以下設置。
楷模
/// <summary>
/// Represents one inquiry on the helpdesk.
/// Category, Country and RelatedProduct should perhaps be objects instead of strings.
/// </summary>
public class Inquiry : TextPost
{
public string Title { get; set; }
public bool Solved { get; set; }
public bool Private { get; set; }
public List<Comment> Comments { get; set; } = new List<Comment>();
public string Category { get; set; }
#region optional properties
/// <summary>
/// Which country this inquiry is most relevant for. E.g. Denmark, Sweden, Norway etc., but can also be "All" or the name of a specific market.
/// </summary>
public string Country { get; set; }
/// <summary>
/// In case the inquiry is related to one or more products. Should perhaps be an object in it's own right instead of a string as it is now.
/// </summary>
public string RelatedProduct { get; set; }
#endregion
}
public class Comment : TextPost
{
public int InquiryID { get; set; }
}
public class TextPost
{
[Key]
public int ID { get; set; }
public User User { get; set; }
public DateTime TimePosted { get; set; }
/// <summary>
/// The main text.
/// </summary>
public string Text { get; set; }
}
public class CommentCreationDTO
{
public int IDOfInquiryBelongingTo { get; set; }
/// <summary>
/// The comment that is being created.
/// </summary>
public Comment Comment { get; set; }
}
您需要在<form>
包含路由/查詢字符串值,或者為IDOfInquiryBelongingTo
包含隱藏的輸入,以便其值在請求中發送並綁定到您的模型。
但是,在編輯數據(您的Comment
屬性)時,視圖模型不應包含數據模型,並且TimePosted
似乎是用戶不可編輯的屬性。 我建議您首先將視圖模型修改為
public class CommentVM
{
public int? ID { get; set; } // if you also want to use this for editing existing comments
[Required]
public int? InquiryID { get; set; }
[Required(ErrorMessage = "Please enter a comment")]
public string Text { get; set; }
}
您的GET方法現在將向視圖返回CommentVM
的實例
public IActionResult Create([FromRoute] int id) //id = InquiryID
{
CommentVM model = new CommentVM
{
InquiryID = id
}
return View(model);
}
視圖
@model ....CommentVM
<form asp-controller="Comments" asp-action="Create">
<div asp-validation-summary="ModelOnly" class="text-danger"></div>
<input type="hidden" asp-for="InquiryID" /> // add hidden input
<div class="form-group">
<label asp-for="Text" class="control-label"></label>
<input asp-for="Text" class="form-control" />
<span asp-validation-for="Text" class="text-danger"></span>
</div>
</form>
然后在POST方法中,將視圖模型映射到數據模型
public async Task<IActionResult> Create([FromForm]CommentVM model)
{
if (!ModelState.IsValid)
{
return View(model);
}
Comment comment = new Comment
{
InquiryID = model.InquiryID,
Text = model.Text,
TimePosted = DateTime.Now,
.... // set other properties (User etc) as required
};
// save and redirect
....
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.