Skip to content

feat(object-mapping): support mapping types with restricted access #1668

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Jul 7, 2025

Conversation

injectives
Copy link
Contributor

@injectives injectives commented Jul 5, 2025

The updated Object Mapping implementation attempts to make constructors with restricted access available to it. If successful, it considers them during the constructor search. However, it prefers constructors that are accessible by default when they have the same number of matched and mismatched properties.

Given the objective of providing an easy and type-safe way of accessing user-defined values in MapAccessor, it would would sometimes to convenient to define the target type and map to it within the same method. For example:

record Movie(String title, String tagline, long released) {}

var movies = driver.executableQuery("MATCH (movie:Movie) RETURN movie")
        .execute()
        .records()
        .stream()
        .map(record -> record.get("movie").as(Movie.class))
        .toList();

However, such Java record has restricted access from Object Mapping implementation perspective. This update makes it possible to map to such types.

In addition, the following bugs have been fixed:

  • null type name was used in exception message when local record mapping failed
  • nonexistent properties were considered as matched on nodes and relationships

@injectives injectives marked this pull request as draft July 5, 2025 08:41
@injectives injectives changed the title draft feat(object-mapping): support mapping types with restricted access Jul 5, 2025
@injectives injectives force-pushed the mapping branch 4 times, most recently from e2bd2c9 to feb02c6 Compare July 7, 2025 09:21
@injectives injectives marked this pull request as ready for review July 7, 2025 09:21
Copy link

@MaxAake MaxAake left a comment

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

The updated Object Mapping implementation attempts to make constructors with restricted access available to it. If successful, it considers them during the constructor search. However, it prefers constructors that are accessible by default when they have the same number of matched and mismatched properties.

Given the objective of providing an easy and type-safe way of accessing user-defined values in `MapAccessor`, it would would sometimes to convenient to define the target type and map to it within the same method. For example:

```java
record Movie(String title, String tagline, long released) {}

var movies = driver.executableQuery("MATCH (movie:Movie) RETURN movie")
        .execute()
        .records()
        .stream()
        .map(record -> record.get("movie").as(Movie.class))
        .toList();
```

However, such Java `record` has restricted access from Object Mapping implementation perspective. This update makes it possible to map to such types.

In addition, the following bugs have been fixed:
- `null` type name was used in exception message when local `record` mapping failed
- nonexistent properties were considered as matched on nodes and relationships
Copy link

@MaxAake MaxAake left a comment

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

✅ ✖️ 2️⃣

@injectives injectives merged commit 26731c6 into neo4j:6.x Jul 7, 2025
16 of 20 checks passed
@injectives injectives deleted the mapping branch July 7, 2025 14:42
injectives added a commit to injectives/neo4j-java-driver that referenced this pull request Jul 7, 2025
…eo4j#1668)

The updated Object Mapping implementation attempts to make constructors with restricted access available to it. If successful, it considers them during the constructor search. However, it prefers constructors that are accessible by default when they have the same number of matched and mismatched properties.

Given the objective of providing an easy and type-safe way of accessing user-defined values in `MapAccessor`, it would would sometimes to convenient to define the target type and map to it within the same method. For example:

```java
record Movie(String title, String tagline, long released) {}

var movies = driver.executableQuery("MATCH (movie:Movie) RETURN movie")
        .execute()
        .records()
        .stream()
        .map(record -> record.get("movie").as(Movie.class))
        .toList();
```

However, such Java `record` has restricted access from Object Mapping implementation perspective. This update makes it possible to map to such types.

In addition, the following bugs have been fixed:
- `null` type name was used in exception message when local `record` mapping failed
- nonexistent properties were considered as matched on nodes and relationships
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Labels
None yet
Projects
None yet
Development

Successfully merging this pull request may close these issues.

2 participants