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interface User {
id: string;
username: string;
email: string;
age?: number; // Optional property
location?: string;
}
interface Post {
id: string;
title: string;
content: string;
createdAt: Date;
tags?: string[];
}
interface FOLLOWS {
since: Date; // Property on the relationship
isMutual?: boolean;
}
type NodeLabel = "User" | "Post" | "Comment";
type RelationshipType = "FOLLOWS" | "LIKES" | "POSTED" | "COMMENTS_ON";
// Generic interfaces to represent graph elements
interface GraphNode<T> {
label: NodeLabel;
properties: T;
}
interface GraphRelationship<FROM_PROPS, TO_PROPS, REL_PROPS> {
type: RelationshipType;
from: GraphNode<FROM_PROPS>;
to: GraphNode<TO_PROPS>;
properties?: REL_PROPS;
}
// Example usage for clarity
const aliceNode: GraphNode<User> = {
label: "User",
properties: { id: "u_alice", username: "alice_global", email: "alice@global.com", age: 30, location: "New York" }
};
const postOneNode: GraphNode<Post> = {
label: "Post",
properties: { id: "p_123", title: "Global Tech Trends", content: "Discussing AI across continents...", createdAt: new Date() }
};
const aliceFollowsBob: GraphRelationship<User, User, FOLLOWS> = {
type: "FOLLOWS",
from: aliceNode,
to: {
label: "User",
properties: { id: "u_bob", username: "bob_dev", email: "bob@dev.net" } // Bob's node can be defined inline or separately
},
properties: { since: new Date("2023-01-15T10:00:00Z"), isMutual: false }
};
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ç¹å®ã®ã¯ãšãªèšèª (äŸïŒNeo4j ã®å Žå㯠CypherãTinkerPop ã®å Žå㯠Gremlin) ã®æååè£éã¯åçãªãŸãŸã§ãããã©ãããŒé¢æ°ãšçµæããã»ããµã¯å³å¯ã«åä»ãã§ããŸããããšãã°ãOGM ã§ã¯ã次ã®ããã«èšè¿°ã§ããŸãã
import { Neo4jOGM } from '@my-org/neo4j-ogm'; // Hypothetical OGM
const ogm = new Neo4jOGM();
async function getUserPosts(userId: string): Promise<User | null> {
// Assuming ogm.findNodeByLabel returns a strongly typed result based on the interface
const userWithPosts = await ogm.findNodeByLabel("User")
.where({ id: userId })
.withRelations<Post>("POSTED", "Post", (rel) => rel.to)
.returnAs<User & { posts: Post[] }>();
return userWithPosts;
}
// Example of how the compiler helps:
// If 'id' was misspelled as 'idx', TypeScript would flag it immediately during development.
// If 'posts' was expected to be an array of numbers but was actually objects, the type system would warn.
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