php - Laravel 5.4:在Laravel Eloquent中转换原始SQL查询

我正在尝试重写此SQL查询，但此时此刻我被困住了

该查询旨在通过使用子查询仅将最新条目连接到Projects表到project_progress表

SELECT * FROM projects
JOIN project_progress ON project_progress.id =
(
    SELECT id FROM project_progress
    WHERE project_progress.project_id = projects.id
    ORDER BY project_progress.created_at DESC
    LIMIT 1
)
WHERE project_progress.next_action_date < NOW()
AND projects.status != 'Complete'
AND projects.member_id = 1
ORDER BY projects.title ASC

至：

$projects = App\Project::where('member_id', 1)
    ->join('project_progress', function ($join) {
        $join->on('project_progress.id', '=', function ($query) {
            $query->select('project_progress.id')
                ->from('project_progress')
                ->where('project_progress.project_id', 'projects.id')
                ->orderBy('project_progress.created_at', 'desc')
                ->limit(1);
        });
    })
    ->where('project_progress.next_action_date', '<', Carbon\Carbon::now())
    ->notCompleted()
    ->orderBy('projects.project_title', 'asc')
    ->get();

我认为此行有些错误，但是我不确定如何写

$join->on('project_progress.id', '=', function ($query) {

ErrorException（E_ERROR）strtolower（）期望参数1为字符串，对象指定为\ vendor \ laravel \ framework \ src \ Illuminate \ Database \ Grammar.php

最佳答案

使用where()：

$join->where('project_progress.id', '=', function ($query) {