Help understanding relations

Hey all, just trying to get my head around relations. In this example we have a one-to-many relationship:

export const users = mysqlTable("users", {
  id: serial("id").primaryKey(),
  username: varchar("username", { length: 120 }),
});

export const blocks = mysqlTable("blocks", {
  id: serial("id").primaryKey(),
  block_type: int("type"),
  user_id: int("user_id"),
});

export const usersRelations = relations(users, ({ many }) => ({
  pagebuilder: many(blocks),
}));

(async () => {
  const user = await db.query.users.findFirst({
    where: eq(users.username, "johnsmith"),
    with: {
      pagebuilder: true,
    },
  });
  // user.pagebuilder[0].block_type ☑️
})();

export const users = mysqlTable("users", {
  id: serial("id").primaryKey(),
  username: varchar("username", { length: 120 }),
});

export const blocks = mysqlTable("blocks", {
  id: serial("id").primaryKey(),
  block_type: int("type"),
  user_id: int("user_id"),
});

export const usersRelations = relations(users, ({ many }) => ({
  pagebuilder: many(blocks),
}));

(async () => {
  const user = await db.query.users.findFirst({
    where: eq(users.username, "johnsmith"),
    with: {
      pagebuilder: true,
    },
  });
  // user.pagebuilder[0].block_type ☑️
})();

How is the query 'joining' the tables when I havent defined which columns are related. Or in this case do 'all' block rows get attached?

2 Replies

d1ge•15mo ago

Try:

const query = await db.query.users.findFirst({
    where: eq(users.username, "johnsmith"),
    with: {
      pagebuilder: true,
    },
  }).toSQL()

console.log(query);

const query = await db.query.users.findFirst({
    where: eq(users.username, "johnsmith"),
    with: {
      pagebuilder: true,
    },
  }).toSQL()

console.log(query);

To see what its doing behind the scenes 🙂 Might explain it all!

JimOP•15mo ago

Good tip for a beginner like me thank you!

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Help understanding relations