larvel 9编辑/更新功能返回呼叫到null上的成员函数商店（）

Question

我有一个博客，我在其中创建一个更新功能，然后从“图像”字段中删除了所需的参数并将其设置为“无效”，因为为用户提供了一个选择图像是否愿意的选择是有意义的创建他们的帖子后。

更具体地更新功能

public function update(Request $request, Posts $post) {
    $formFields = $request->validate([
        'title' => 'required|min:3|max:50',
        'image' => 'nullable|image|mimes:jpg,png,jpeg,gif,svg|max:2048',
        'sub_title' => 'required|min:3|max:100',
        'tags' => 'required|min:3|max:20',
        'content' => 'required',
        'featured' => 'nullable',
    ]);

    $image_path = $request->file('image')->store('thumbnails', 'public');

    if($request->has('featured')) {
        Posts::where('featured', '=',1)
        ->update(['featured' => false]);
    }

    $post->update([
        'title' => $request->post('title'),
        'image' => $image_path,
        'sub_title' => $request->post('sub_title'),
        'tags' => $request->post('tags'),
        'content' => $request->post('content'),
        'featured' => ($request->has('featured')) ? true : false,
    ]);

    return redirect('/')->with('message', 'Post updated successfully!');  
}

，在此行上指出了该错误：

$image_path = $request->file('image')->store('thumbnails', 'public');

Answer 1

仅当您拥有新的映像文件时，才应调用store方法：

$image_path = $request->file('image')?->store('thumbnails', 'public');

然后仅在拥有新image时才添加$ image_path属性：

$attributes = [
        'title' => $request->post('title'),
        'sub_title' => $request->post('sub_title'),
        'tags' => $request->post('tags'),
        'content' => $request->post('content'),
        'featured' => ($request->has('featured')) ? true : false,
    ];

if ($image_path) {
    $attributes['image'] = $image_path;
}

$post->update($attributes);