[英]Swift & Vapor/Fluent : How to pull values from another table during a post router request
I'm writing a backend app in Xcode 11.2
using Vapor3
and Fluent
with SQLite
.我正在Xcode 11.2
使用Vapor3
和Fluent
with SQLite
编写后端应用程序。 I have a route for a POST
request to update a record in Table1, but before I save the record, I need to pull values from another table with a key that's in one of the fields I'm passing in. The part that I'm getting stuck on is accessing that data from the other table.我有一个POST
请求的路由来更新表 1 中的记录,但在保存记录之前,我需要从另一个表中提取值,该表的键位于我传入的字段之一中。我的部分我陷入困境是从另一个表访问该数据。
What I have so far:到目前为止我所拥有的:
Table for staff员工桌
final class Staff: Content, SQLiteUUIDModel, Migration, Parameter {
var id: UUID?
var staffID: String (value that's in the other table to match)
var value1: Int (one of the values I'm trying to fetch)
var value2: Int (another value I'm trying to fetch)
...(additional variables and Init
Table for assignments作业表
final class Assignments: Content, SQLiteUUIDModel, Migration, Parameter {
var id: UUID?
var staffID: String
...(additional variables and Init
Route for incoming POST request to update existing Assignment:用于更新现有分配的传入 POST 请求的路由:
router.post("update", Assignments.parameter) { req -> Future<Assignments> in
return try req.parameters.next(Assignments.self).flatMap { Assignment in
return try req.content.decode(Assignments.self).flatMap { updatedAssignment in
(Code where I perform calculations on the incoming 'Assignment' and save to 'updatedAssignment' before calling:)
return WorkOrder.save(on: req)
The route I have works, incoming data is modified and written to the SQLite database, however there are a couple of fields that I need to perform calculations on or set to values stored in the Staff table.我的路线有效,传入的数据被修改并写入 SQLite 数据库,但是我需要对几个字段执行计算或设置为存储在 Staff 表中的值。 IE: IE:
editedAssignment.variable = (variable) * (value1 from staff table for matching staffID)
editedAssignment.variable = (value2 from staff table for matching staffID)
What I've tried so far到目前为止我尝试过的
let staffData = Staff.query(on: req).filter(\.staffID == staffID).all() before the calculations
(adding as a Future as:)
router.post(...) { req -> Future<Staff> in return try Staff.query(on: req).filter ...(rest of query)
-- this method throws off the whole request, the values of the incoming request are just lost. - 此方法抛出关闭整个请求,传入请求的值刚刚失去。
Ideally, if I could call a query and save as a dictionary in the calculations, that would be ideal, I just can't seem to "figure it out".理想情况下,如果我可以在计算中调用查询并另存为字典,那将是理想的,我似乎无法“弄清楚”。
You need to put it inside your route, so that it is part of the chain, rather than disjointed as you had it:您需要将它放在您的路线中,以便它成为链条的一部分,而不是像您一样脱节:
router.post("update", Assignments.parameter) {
req -> Future<Assignments> in
return try req.parameters.next(Assignments.self).flatMap {
assignment in
return try req.content.decode(Assignments.self).flatMap {
updatedAssignment in
return Staff.query(on: req).filter(\.staffID == staffID).first().flatMap {
staffData in
/* Code to update 'updatedAssignment' */
return WorkOrder.save(on: req)
}
}
}
}
You will most likely get compiler errors and need to put explicit return types in, but I can't predict/test these.您很可能会遇到编译器错误并需要输入显式返回类型,但我无法预测/测试这些。 I've left it in, but I don't think it is a good idea that you are explicitly stating a Future<Assignments>
is being returned when you end up with the return from WorkOrder.save...
.我已经把它留在了,但我认为当你最终从WorkOrder.save...
返回时明确声明正在返回Future<Assignments>
并不是一个好主意。
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