Question

以下是我的架构：

var BookSchema = new Schema({
    title: String,
    author: String,
    category: String,
    },{
    versionKey: false 
});

当我通过删除以下任意字段来发布数据时（类别已删除）：

{
  "title":"Book1",
  "author":"abc"
}

我的实际POST响应是：

{
  "_id": "5d47cbe70d7cae1e847a00f0",
  "title": "Book1",
  "author": "abc"
}

我希望响应应该像：

  {
      "_id": "5d47cbe70d7cae1e847a00f0",
      "title": "Book1",
      "author": "abc",
      "category":""
    }

如何使用猫鼬模式在nodejs中实现这一目标？

Answer 1

请找到link来设置默认值。

Answer 2

在@Ravi的答案中，使用默认值更改架构将会返回

 $stmt = $db->query("SELECT name, last_name FROM `designers` WHERE `username` = '" . $_SESSION['username'] . "'");
  $result1 = $stmt->fetch(PDO::FETCH_ASSOC); 
 $name = $result1['name'];
  $last_name = $result1['last_name'];

      if (isset($_GET['pageno'])) {
        $pageno = $_GET['pageno'];
    } else {
        $pageno = 1;
    }
    $no_of_records_per_page = 15;
    $offset = ($pageno-1) * $no_of_records_per_page;
    $conn=mysqli_connect("xxx", "xxx", "xxx", "xxx");
    $total_pages_sql = "SELECT COUNT(*) FROM protonumbers WHERE designer LIKE '".$name.'_'.$last_name."'";
    $result = mysqli_query($conn,$total_pages_sql);
    $total_rows = mysqli_fetch_array($result)[0];
    $total_pages = ceil($total_rows / $no_of_records_per_page);

?>
  <div class="container">

<div class="row">
    <div class="col-xs-12 col-sm-8 col-md-6 col-sm-offset-2 col-md-offset-3">
        <form action="search.php" autocomplete="off" method="post">
            <h3>My Proto Numbers</h3><hr><br>
                            <?php
            //check for any errors
            if(isset($error)){
                foreach($error as $error){
                    echo '<p class="bg-danger">'.$error.'</p>';
                }
            }
            ?>
            </div>
            </div>
     </div>
            <?php

if(isset($_POST['search']))
{
$valueToSearch = $_POST['valueToSearch'];
// search in all table columns
// using concat mysql function
$query = "SELECT * FROM `protonumbers` WHERE UPPER(CONCAT(`brand`, `protoID`, `season`, `program`, `protonumber`)) LIKE UPPER('%".$valueToSearch."%') AND designer LIKE '".$name.'_'.$last_name."' LIMIT $offset, $no_of_records_per_page";
$search_result = filterTable($query);
}
else {
$query = "SELECT * FROM `protonumbers` WHERE designer LIKE '".$name.'_'.$last_name."' LIMIT $offset, $no_of_records_per_page";
$search_result = filterTable($query);
}

// function to connect and execute the query
function filterTable($query)
{
$connect = mysqli_connect("xxx", "xxx", "xxx", "xxx");
$filter_Result = mysqli_query($connect, $query);
return $filter_Result;
}

?>
<div class="container">
<div class="row">
    <div class="col-xs-12 col-sm-8 col-md-6 col-sm-offset-2 col-md-offset-3">
            <div class="form-group">
                <input type="text" name="valueToSearch" class="form-control input-lg" placeholder="Search by Proto number, Season, Brand, Program" tabindex="1">

            <div class="row"><br />
                <div class="col-xs-6 col-md-6">
                    <input type="submit" name="search" value="Search" class="btn btn-primary btn-block btn-lg" tabindex="2"></form></div></div></div></div>
                     <div class="col-xs-12 col-sm-8 col-md-6 col-sm-offset-2 col-md-offset-3">
                                            <a href="index.php">Back</a><br><br>        <ul class="pagination">
    <li><a href="?pageno=1">First</a></li>
    <li class="<?php if($pageno <= 1){ echo 'disabled'; } ?>">
        <a href="<?php if($pageno <= 1){ echo '#'; } else { echo "?pageno=".($pageno - 1); } ?>">Prev</a>
    </li>
    <li class="<?php if($pageno >= $total_pages){ echo 'disabled'; } ?>">
        <a href="<?php if($pageno >= $total_pages){ echo '#'; } else { echo "?pageno=".($pageno + 1); } ?>">Next</a>
    </li>
    <li><a href="?pageno=<?php echo $total_pages; ?>">Last</a></li>
</ul> 
            <table>
            <tr>
                <th>ProtoID</th>
                <th>Brand</th>
                <th>Season</th>
                <th>Program</th>
                <th>Proto Number</th>
            </tr>

  <!-- populate table from mysql database -->
            <?php while($row = mysqli_fetch_array($search_result)):?>
            <tr>
                <td><?php echo $row['protoID'];?></td>
                <td><?php echo $row['brand'];?></td>
                <td><?php echo $row['season'];?></td>
                <td><?php echo $row['program'];?></td>
                <td><?php echo $row['protonumber'];?></td>
            </tr>
            <?php endwhile;?>
        </table>

将没有在请求主体中传递为null或空的字段存储到mongodb（使用mongoose模式定义集合）

2 个答案: