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

Question

I'm trying to rewrite this SQL query but I'm stuck at this point

The query is meant to join the projects table to the project_progress table by using a sub-query to only join on the latest entry

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

To:

$projects = App\Project::where('member_id', 1)
    ->join('project_progress', function ($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();

I think some thing is wrong with this line but I'm not sure how to write it

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

ErrorException (E_ERROR) strtolower() expects parameter 1 to be string, object given \\vendor\\laravel\\framework\\src\\Illuminate\\Database\\Grammar.php

Answer 1

使用where() ：

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