doctrine/orm · error · InvalidArgumentException

Type should be a ToOne Association here

Error message

Type should be a ToOne Association here

What it means

Error "Type should be a ToOne Association here" thrown in doctrine/orm.

Source

Thrown at src/Mapping/Builder/AssociationBuilder.php:173

        return $this;
    }

    /** @throws InvalidArgumentException */
    public function build(): ClassMetadataBuilder
    {
        $mapping = $this->mapping;
        if ($this->joinColumns) {
            $mapping['joinColumns'] = $this->joinColumns;
        }

        $cm = $this->builder->getClassMetadata();
        if ($this->type === ClassMetadata::MANY_TO_ONE) {
            $cm->mapManyToOne($mapping);
        } elseif ($this->type === ClassMetadata::ONE_TO_ONE) {
            $cm->mapOneToOne($mapping);
        } else {
            throw new InvalidArgumentException('Type should be a ToOne Association here');
        }

        return $this->builder;
    }
}

View on GitHub (pinned to d9b9ff7301)

When it happens

Trigger: Thrown at src/Mapping/Builder/AssociationBuilder.php:173 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of doctrine/orm@d9b9ff7301 (2026-08-21). Data as JSON: /api/errors/e54672dbd79b7cd5. Report an issue: GitHub.