我正在使用PERN堆栈编写每日日托报告应用程序，我遇到了一些POST端点问题。下面的一个正常工作：
> dat <- read.csv(text= "hd1 , hd2, hd3\n 1, a , c\n1,b,d\n")
> dat
hd1 hd2 hd3
1 1 a c
2 1 b d
> dput(dat)
structure(list(hd1 = c(1L, 1L), hd2 = structure(1:2, .Label = c(" a ",
"b"), class = "factor"), hd3 = structure(1:2, .Label = c(" c",
"d"), class = "factor")), .Names = c("hd1", "hd2", "hd3"), class = "data.frame", row.names = c(NA,
-2L))
> dat <- data.frame(
lapply(read.csv(text= "hd1 , hd2, hd3\n 1, a , c\n1,b,d\n"),
trimws)
)
# could also have used a two step process starting with the original `dat`
# dat[] <- lapply(dat, trimws) .... the `[]` preserves structure
> dat
hd1 hd2 hd3
1 1 a c
2 1 b d
> dput(dat)
structure(list(hd1 = structure(c(1L, 1L), .Label = "1", class = "factor"),
hd2 = structure(1:2, .Label = c("a", "b"), class = "factor"),
hd3 = structure(1:2, .Label = c("c", "d"), class = "factor")), .Names = c("hd1",
"hd2", "hd3"), row.names = c(NA, -2L), class = "data.frame")
但是我还有一些其他人用与错误相同的方式编写：
TypeError students.createStudent不是函数
下面的一个不起作用并抛出上述错误消息
app.get('/classroomList', (req, res) => {
classroom.getClassrooms().then((classrooms) => { res.send(classrooms) })
})
app.get('/classroomList/:id',(req,res)=>{
classroom.getStudentsByClass(req.params.id).then((student)=>{
res.send(student)
})
})
app.post('/classroomList', (req, res) => {
classroom.createClassroom(req.body)
.then((classroom)=>{res.send(classroom.attributes)})
})
app.delete('/classroomList/:id', (req, res) => {
console.log('req received')
classroom.deleteClassroom(req.params.id).then((classroom) => {
res.send('Deleted')
})
})
}
这是可行的控制器：
module.exports = (app) => {
const students = require('../controllers/studentController')
app.get('/studentList', (req, res) => {
students.getStudents().then((students) => { res.send(students) })
})
app.delete('/studentList/:id', (req, res) => {
students.deleteStudent(req.params.id).then((student) => {
res.send('Deleted')
})
})
app.post('/studentList', (req, res) => {
console.log(req.body)
students.createStudent(req.body)
.then((student)=>{console.log(student.attributes)})
})
}
这个不是：
exports.createClassroom = (classroom) => {
console.log('function accessed')
const newClassroom = new Classroom(
classroom)
return newClassroom.save()
.then(classroom => {
return classroom;
})
.catch(err => {
console.log(err)
})