Lookitsatravis\Listify\Listify::scopeCondition PHP Method

    private function scopeCondition()
    {
        $theScope = $this->scopeName();
        if ($theScope === NULL) {
            throw new NullScopeException('You cannot pass in a null scope into Listify. It breaks stuff.');
        }
        if ($theScope !== $this->defaultScope) {
            if (is_string($theScope)) {
                //Good for you for being brave. Let's hope it'll run in your DB! You sanitized it, right?
                $this->stringScopeValue = $theScope;
            } else {
                if (is_object($theScope)) {
                    $reflector = new \ReflectionClass($theScope);
                    if ($reflector->getName() == 'Illuminate\\Database\\Eloquent\\Relations\\BelongsTo') {
                        $relationshipId = $this->getAttribute($theScope->getForeignKey());
                        if ($relationshipId === NULL) {
                            throw new NullForeignKeyException('The Listify scope is a "belongsTo" relationship, but the foreign key is null.');
                        } else {
                            $theScope = $theScope->getForeignKey() . ' = ' . $this->getAttribute($theScope->getForeignKey());
                        }
                    } else {
                        if ($reflector->getName() == 'Illuminate\\Database\\Query\\Builder') {
                            $theQuery = $this->getConditionStringFromQueryBuilder($theScope);
                            $this->stringScopeValue = $theQuery;
                            $theScope = $theQuery;
                        } else {
                            throw new InvalidScopeException('Listify scope parameter must be a String, an Eloquent BelongsTo object, or a Query Builder object.');
                        }
                    }
                } else {
                    throw new InvalidScopeException('Listify scope parameter must be a String, an Eloquent BelongsTo object, or a Query Builder object.');
                }
            }
        }
        return $theScope;
    }