src/PicORM/Collection.php
public function offsetSet($offset, $value)
    {
        if (!$this->isFetched) {
            $this->fetch();
        }

        if (is_null($offset)) {
            $this->models[] = $value;
        } else {
            $this->models[$offset] = $value;
        }
    }
public function offsetSet($offset, $value)
    {
        if (!$this->isFetched) {
            $this->fetch();
        }

        if (is_null($offset)) {
            $this->models[] = $value;
        } else {
            $this->models[$offset] = $value;
        }
    }
Offset to set

@param mixed $offset - Offset name to set
@param mixed $value  - Value to set

@return void