e621-sdk-go/database/neo4j/relationship.go

package neo4j

import (
	"context"
	"github.com/neo4j/neo4j-go-driver/v5/neo4j"
)

func EstablishPostTagLink(ctx context.Context, driver neo4j.DriverWithContext, e621PostID int64, e621Tag string) error {
	query := `
		MATCH (p:e621Post {e621PostID: $e621PostID})
		MATCH (t:e621Tag {e621Tag: $e621Tag})
		MERGE (p)-[:HAS_TAG]->(t)
		`
	params := map[string]interface{}{
		"e621PostID": e621PostID,
		"e621Tag":    e621Tag,
	}

	_, err := neo4j.ExecuteQuery(ctx, driver, query, params, neo4j.EagerResultTransformer)
	if err != nil {
		return err
	}

	return nil
}

func EstablishPostToSourceLink(ctx context.Context, driver neo4j.DriverWithContext, e621PostID int64, sourceURL string) error {
	query := `
		MATCH (p:e621Post {e621PostID: $e621PostID})
		MATCH (s:Source {URL: $sourceURL})
		MERGE (p)-[:HAS_SOURCE]->(s)
		`
	params := map[string]interface{}{
		"e621PostID": e621PostID,
		"sourceURL":  sourceURL,
	}

	_, err := neo4j.ExecuteQuery(ctx, driver, query, params, neo4j.EagerResultTransformer)
	if err != nil {
		return err
	}

	return nil
}

func EstablishUserToPostLink(ctx context.Context, driver neo4j.DriverWithContext, e621PostID int64, e621UserID int64) error {
	query := `
		MATCH (p:e621Post {e621PostID: $e621PostID})
		MATCH (u:e621User {e621ID: $e621ID})
		MERGE (u)-[:IS_FAVORITE]->(p)
		`
	params := map[string]interface{}{
		"e621PostID": e621PostID,
		"e621ID":     e621UserID,
	}

	_, err := neo4j.ExecuteQuery(ctx, driver, query, params, neo4j.EagerResultTransformer)
	if err != nil {
		return err
	}

	return nil
}

// CheckUserToPostRelationship gives back a bool if the connection between the post and the user exists
func RelationshipCheckUserToPost(ctx context.Context, driver neo4j.DriverWithContext, e621PostID int64, e621UserID int64) (bool, error) {
	query := `
		MATCH (user:e621User {e621ID: $e621ID})-[favorite:IS_FAVORITE]->(post:e621Post {e621PostID: $e621PostID})
		RETURN COUNT(favorite) > 0 AS isFavorite
		`
	params := map[string]interface{}{
		"e621PostID": e621PostID,
		"e621ID":     e621UserID,
	}

	result, err := neo4j.ExecuteQuery(ctx, driver, query, params, neo4j.EagerResultTransformer)
	if err != nil {
		return false, err
	}

	exists, _, err := neo4j.GetRecordValue[bool](result.Records[0], "isFavorite")
	if err != nil {
		return false, err
	}
	return exists, nil
}