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app/Models/Dynamic.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Illuminate\Database\Eloquent\Relations\MorphMany;
+use Illuminate\Database\Eloquent\SoftDeletes;
+use Illuminate\Support\Facades\Storage;
+use Illuminate\Support\Str;
+
+class Dynamic extends Model
+{
+    use SoftDeletes;
+
+    protected $casts = [
+        'pictures' => 'json',
+    ];
+
+    public function user()
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function getPicturesUrlAttribute(): array
+    {
+        $pictures = $this->getAttribute('pictures');
+
+        if (empty($pictures)) {
+            return [];
+        }
+
+        return collect($pictures)->map(function ($picture) {
+            return $this->parseImageUrl($picture);
+        })->toArray();
+    }
+
+    /**
+     * Notes   : 解析图片文件的实际展示地址
+     *
+     * @Date   : 2021/3/16 4:53 下午
+     * @Author : < Jason.C >
+     * @param  string|null  $image
+     * @return string
+     */
+    protected function parseImageUrl(?string $image): string
+    {
+        if (empty($image)) {
+            return '';
+        } elseif (Str::startsWith($image, 'http')) {
+            return $image;
+        } else {
+            return Storage::url($image);
+        }
+    }
+
+    public function isLikedBy(User $user): bool
+    {
+        if ($this->relationLoaded('likers')) {
+            return $this->likers->contains($user);
+        }
+        $likes = $this->likers()->where('user_id', $user->getKey())->first();
+        return (bool) $likes;
+    }
+
+    /**
+     * Notes   : 点赞用户
+     *
+     * @Date   : 2021/4/23 4:12 下午
+     * @Author : < Jason.C >
+     * @return BelongsToMany
+     */
+    public function likers(): BelongsToMany
+    {
+        return $this->belongsToMany(
+            User::class,
+            'likes',
+            'likeable_id',
+            'user_id'
+        )->where('likeable_type', $this->getMorphClass());
+    }
+
+    /**
+     * Notes   : 是否被某人评论过了
+     *
+     * @Date   : 2021/4/16 3:44 下午
+     * @Author : < Jason.C >
+     * @param  Model  $user
+     * @return bool
+     */
+    public function isCommentedBy(Model $user): bool
+    {
+        if ($this->relationLoaded('commenters')) {
+            return $this->commenters->contains($user);
+        }
+
+        return $this->comments()->where('user_id', $user->getKey())->exists();
+    }
+
+    /**
+     * Notes   : 评论记录
+     *
+     * @Date   : 2021/4/16 3:44 下午
+     * @Author : < Jason.C >
+     * @return MorphMany
+     */
+    public function comments(): MorphMany
+    {
+        return $this->morphMany(Comment::class, 'commentable');
+    }
+
+    /**
+     * Notes   : 评论用户
+     *
+     * @Date   : 2021/4/23 4:12 下午
+     * @Author : < Jason.C >
+     * @return BelongsToMany
+     */
+    public function commenters(): BelongsToMany
+    {
+        return $this->belongsToMany(
+            User::class,
+            'comments',
+            'commentable_id',
+            'user_id'
+        )->where('commentable_type', $this->getMorphClass());
+    }
+}