Question

我正在尝试在Laravel项目中创建一个关于喜欢和不喜欢的API请求：

Route :: post（'like'，'Api \ ApiController @ like'）;

ApiController中的函数如下：

$post = \App\Post::find($request->id);

$social = SocialPost::where([['user_id', '=', ($request->user_id)],['post_id', '=', ($request->id)]])->first();

$unsocial = SocialPost::where([['user_id', '=', ($request->user_id)],['post_id', '=', ($request->id)],['like', '=', 0]])->first();

if ($social) {
    if ($unsocial) {
        $social->update(['like' => 1]);
        return json_encode(array('status' => true,'msg'=>'like')); 
    }
    else {
        $social->update(['like' => 0]);
        return json_encode(array('status' => true,'msg'=>'dislike')); 
    }
}
else {
    $join = new \App\SocialPost;
    $join->user_id = $request->user_id;
    $join->post_id = $post->id;
    $join->like = 1;
    $join->view = 0;
    $join->creator = 1;
    $join->save();
    return json_encode(array('status' => true,'msg'=>'New table')); 
}

问题在于第一个If语句有效，而第二个if语句无效。如果该行已经存在，那么即使返回的消息是“不喜欢”，他也始终将“喜欢”设置为“ 1”。

Answer 1

这是一个适合您的示例。

<?php

// Get the post from the database
$post = \App\Post::find($request->id);

// Find the SocialPost record if it exists,
// if it doesn't create a new one with no likes
$socialPost = SocialPost::firstOrCreate(
    ['user_id' => $request->user_id, 'post_id' => $post->id],
    ['user_id' => $request->user_id, 'post_id' => $post->id, 'likes' => 0, 'view' => 0, 'creator' => 1],
);

// Declare an empty variable that will determine if
// the post is being "liked" or "disliked"
$postAction = '';

// Determine if the post has likes or not
if ($socialPost->likes > 0)
{
    // The post has at least 1 like
    $postAction = 'dislike';

    // Decrement the likes by 1
    $socialPost->decrement('likes', 1);
}
else
{
    // The post has 0 likes
    $postAction = 'like';

    // Increment the likes by 1
    $socialPost->increment('likes', 1);
}

// Determine if this was a new SocialPost record
if ($socialPost->wasRecentlyCreated)
{
    // Override the post action as "New table"
    $postAction = 'New table';
}

// Return the goods
return json_encode(['status' => true, 'msg' => $postAction]);

说明

您可以使用文档here中引用的firstOrCreate确定是否存在SocialPost记录，或创建一个新记录。第一个数组参数包含您要查找的内容，第二个数组参数包含如果第一个参数未显示任何内容应创建的内容

// Find the SocialPost record if it exists,
// if it doesn't create a new one with no likes
$socialPost = SocialPost::firstOrCreate(
    ['user_id' => $request->user_id, 'post_id' => $post->id],
    ['user_id' => $request->user_id, 'post_id' => $post->id, 'likes' => 0, 'view' => 0, 'creator' => 1],
);

然后，您可以使用文档here中引用的increment或decrement来清理喜欢的加法或减法。

// Determine if the post has likes or not
if ($socialPost->likes > 0)
{
    // Decrement the likes by 1
    $socialPost->decrement('likes', 1);
}
else
{
    // Increment the likes by 1
    $socialPost->increment('likes', 1);
}

Laravel Api-如何喜欢和不喜欢

1 个答案: