finished MVP tasks

api/cars/cars-middleware.js

@@ -1,15 +1,67 @@
-const checkCarId = (req, res, next) => {
-  // DO YOUR MAGIC
+const Car = require('./cars-model')
+const vin  = require('vin-validator') 
+
+const checkCarId = async (req, res, next) => {
+  try{
+    const car = await Car.getById(req.params.id)
+    if(!car){
+      next({ status:404, message: 'not found'})
+    } else
+    req.car = car
+      next()
+  } catch(err){
+    next(err)
+  } 
 }
 
 const checkCarPayload = (req, res, next) => {
-  // DO YOUR MAGIC
+  if(!req.body.vin) return next({
+    status:400,
+    message:'vin is missing',
+  })
+  if(!req.body.make) return next({
+    status:400,
+    message:'make is missing',
+  })
+  if(!req.body.model) return next({
+    status:400,
+    message:'model is missing',
+  })
+  if(!req.body.mileage) return next({
+    status:400,
+    message:'mileage is missing',
+  })
+  next()
 }
 
+
 const checkVinNumberValid = (req, res, next) => {
-  // DO YOUR MAGIC
+  if(vin.validate(req.body.vin)){
+    next()
+  } else{
+    next({
+      status:400,
+      message:`vin ${req.body.vin} is invalid`
+    })
+  }
+}
+
+const checkVinNumberUnique = async(req, res, next) => {
+  try{
+    const existing = await Car.getByVin(req.body.vin)
+    if(!existing) {
+      next()
+    } else {
+      next({ status:400, message: `vin ${req.body.vin} already exists`})
+    }
+  } catch(err) {
+    next(err)
+  }
 }
 
-const checkVinNumberUnique = (req, res, next) => {
-  // DO YOUR MAGIC
+module.exports = {
+  checkCarId,
+  checkCarPayload,
+  checkVinNumberValid,
+  checkVinNumberUnique
 }

api/cars/cars-model.js

@@ -1,11 +1,26 @@
+const db = require('../../data/db-config')
+
 const getAll = () => {
-  // DO YOUR MAGIC
+  return db('cars')
+}
+
+const getById = (id) => {
+  return db('cars').where('id', id).first()
 }
 
-const getById = () => {
-  // DO YOUR MAGIC
+const getByVin = (vin) => {
+  return db('cars').where('vin',vin).first()
 }
 
-const create = () => {
-  // DO YOUR MAGIC
+const create = (car) => {
+  return db('cars').insert(car)
+  .then(([id]) => 
+    getById(id))
 }
+
+module.exports = {
+  getAll,
+  getById,
+  create,
+  getByVin,
+  }

api/cars/cars-router.js

@@ -1 +1,39 @@
-// DO YOUR MAGIC
+const express = require('express')
+const Car = require('./cars-model')
+const {
+    checkCarId,
+    checkCarPayload,
+    checkVinNumberValid,
+    checkVinNumberUnique
+} = require('./cars-middleware')
+
+const router = express.Router()
+
+router.get('/', async (req,res,next) => {
+    try{
+        const cars= await Car.getAll()
+        res.json(cars)
+    } catch (err){
+        next(err)
+    }
+})
+
+router.get('/:id', checkCarId, (req,res,next) => {
+        res.json(req.car)
+})
+
+router.post(
+    '/',
+    checkCarPayload,
+    checkVinNumberValid,
+    checkVinNumberUnique,
+     async( req, res, next) => {
+    try {
+        const car = await Car.create(req.body)
+        res.json(car)
+    } catch(err) {
+        next(err)
+    }
+})
+
+module.exports = router

data/migrations/01-make_cars_table.js

@@ -1,7 +1,22 @@
 exports.up = function (knex) {
-  // DO YOUR MAGIC
+  return knex.schema.createTable('cars', tbl => {
+    tbl.increments()
+
+    tbl.string('vin', 17). notNullable().unique()
+
+    tbl.string('make', 128)
+
+    tbl.string('model', 256).notNullable()
+
+    tbl.integer('mileage').unsigned().notNullable()
+
+    tbl.string('title', 128)
+
+    tbl.string('transmission', 128)
+  })
 };
 
+
 exports.down = function (knex) {
-  // DO YOUR MAGIC
+  return knex.schema.dropTableIfExists('cars')
 };