Tanstack-db/packages/db/tests/query/query-builder/select.test.ts at main · fabwebdev/Tanstack-db · GitHub

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import { describe, expect, it } from "vitest"
import { queryBuilder } from "../../../src/query/query-builder.js"
import type { Input, Schema } from "../../../src/query/types.js"

// Test schema
interface Employee extends Input {
  id: number
  name: string
  department_id: number | null
  salary: number
}

interface Department extends Input {
  id: number
  name: string
  budget: number
}

// Make sure TestSchema extends Schema
interface TestSchema extends Schema {
  employees: Employee
  departments: Department
}

describe(`QueryBuilder.select`, () => {
  it(`sets the select clause correctly with individual columns`, () => {
    const query = queryBuilder<TestSchema>()
      .from(`employees`)
      .select(`@id`, `@name`)

    const builtQuery = query._query
    expect(builtQuery.select).toEqual([`@id`, `@name`])
  })

  it(`handles aliased columns`, () => {
    const query = queryBuilder<TestSchema>()
      .from(`employees`)
      .select(`@id`, { employee_name: `@name` })

    const builtQuery = query._query
    expect(builtQuery.select).toHaveLength(2)
    expect(builtQuery.select![0]).toBe(`@id`)
    expect(builtQuery.select![1]).toHaveProperty(`employee_name`, `@name`)
  })

  it(`handles function calls`, () => {
    const query = queryBuilder<TestSchema>()
      .from(`employees`)
      .select(`@id`, {
        upper_name: { UPPER: `@name` },
      })

    const builtQuery = query._query
    expect(builtQuery.select).toHaveLength(2)
    expect(builtQuery.select![1]).toHaveProperty(`upper_name`)
  })

  it(`overrides previous select calls`, () => {
    const query = queryBuilder<TestSchema>()
      .from(`employees`)
      .select(`@id`, `@name`)
      .select(`@id`, `@salary`) // This should override the previous select

    const builtQuery = query._query
    expect(builtQuery.select).toEqual([`@id`, `@salary`])
  })

  it(`supports qualified table references`, () => {
    const query = queryBuilder<TestSchema>()
      .from(`employees`, `e`)
      .select(`@e.id`, `@e.name`)

    const builtQuery = query._query
    expect(builtQuery.select).toEqual([`@e.id`, `@e.name`])
  })

  // Runtime test for the result types
  it(`infers correct result types`, () => {
    const query = queryBuilder<TestSchema>()
      .from(`employees`)
      .select(`@id`, `@name`)

    // We can't directly assert on types in a test, but we can check
    // that the query is constructed correctly, which implies the types work
    const builtQuery = query._query
    expect(builtQuery.select).toEqual([`@id`, `@name`])
  })

  it(`supports callback functions`, () => {
    const callback = ({ employees }: any) => ({
      fullInfo: `${employees.name} (ID: ${employees.id})`,
      salaryLevel: employees.salary > 50000 ? `high` : `low`,
    })

    const query = queryBuilder<TestSchema>().from(`employees`).select(callback)

    const builtQuery = query._query
    expect(builtQuery.select).toHaveLength(1)
    expect(builtQuery.select).toBeDefined()
    expect(typeof builtQuery.select![0]).toBe(`function`)
    expect(builtQuery.select![0]).toBe(callback)
  })

  it(`combines callback with traditional selects`, () => {
    const callback = ({ employees }: any) => ({
      computed: employees.salary * 1.1,
    })

    const query = queryBuilder<TestSchema>()
      .from(`employees`)
      .select(`@id`, `@name`, callback, { department_name: `@employees.name` })

    const builtQuery = query._query
    expect(builtQuery.select).toHaveLength(4)
    expect(builtQuery.select).toBeDefined()
    expect(builtQuery.select![0]).toBe(`@id`)
    expect(builtQuery.select![1]).toBe(`@name`)
    expect(typeof builtQuery.select![2]).toBe(`function`)
    expect(builtQuery.select![3]).toHaveProperty(`department_name`)
  })

  it(`supports multiple callback functions`, () => {
    const callback1 = ({ employees }: any) => ({
      displayName: employees.name.toUpperCase(),
    })
    const callback2 = ({ employees }: any) => ({
      isActive: employees.active,
      experience: new Date().getFullYear() - 2020,
    })

    const query = queryBuilder<TestSchema>()
      .from(`employees`)
      .select(callback1, callback2)

    const builtQuery = query._query
    expect(builtQuery.select).toHaveLength(2)
    expect(builtQuery.select).toBeDefined()
    expect(typeof builtQuery.select![0]).toBe(`function`)
    expect(typeof builtQuery.select![1]).toBe(`function`)
    expect(builtQuery.select![0]).toBe(callback1)
    expect(builtQuery.select![1]).toBe(callback2)
  })
})