Eloquent Fatal error: Call to undefined method Eloquent\Collection::addEagerConstraints() in \illuminate\database\Eloquent\Builder.php on line 451

问题

I am following a tutorial where you can save relationships in one table to determine if a user is friend of another user and viceversa.

In my case, I need to save in a relational table boundTogether_projects those projects that are bound together.

So inside the Project.php Model I created the following Eloquent relationships:

<?php
    /*** Bound together projects ***/
    public function projectsBoundToThisOne(){
        return $this->belongsToMany('Models\User\Project', 'boundTogether_projects', 'bound_id', 'project_id');
    }
    public function boundTo(){
        return $this->belongsToMany('Models\User\Project', 'boundTogether_projects', 'project_id', 'bound_id');
    }
    public function boundTogetherProjects(){
        return $this->projectsBoundToThisOne()->wherePivot('bound',true)->get()->merge($this->boundTo()->wherePivot('bound', true)->get());
    }

This is not working, since I get the following error:

Fatal error: Call to undefined method Illuminate\Database\Eloquent\Collection::addEagerConstraints() in \illuminate\database\Eloquent\Builder.php on line 451

Looks like the problem comes right when I call this method as eager loading. That is to say:

$projects = Project::with('boundTogetherProjects');

The Eloquent version is 5.1

What am I missing? How do I fix it?

回答1:

This is probably because boundTogetherProjects is not relationship method. It simple gets some data from relationship merged to the other. So the valid way would be:

$projects = Project::with('projectsBoundToThisOne','boundTo');

and then for each project you could run boundTogetherProjects to get the projects

$projects->each(function($project) {
  dd($project->boundTogetherProjects());
});

来源：https://stackoverflow.com/questions/39476928/eloquent-fatal-error-call-to-undefined-method-eloquent-collectionaddeagercons

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php

laravel

laravel-4

eloquent