问Shiny小部件不能正确地将值传递给ggplot

EN

library(shiny)
library(shinydashboard)
library(shinyWidgets)
library(ggplot2)
library(plotly)
ui <- dashboardPage(
    header = dashboardHeader(title = "My dashboard"),
    sidebar = dashboardSidebar(
        uiOutput("dbs")

    ),
    body = dashboardBody(
        plotlyOutput("fn")
    )
)

server <- function(input, output, session) {

        sts<-c("Rev","Rev")
        sID<-c("123","124")
        snID<-c("23","34")
        name<-c("s","d")
        pe<-data.frame(sts,sID,snID,name)



    output$dbs<-renderUI({

            pickerInput("DB", "Select Database/s", 
                        choices = c("name","snID"), 
                        multiple = F,options = list(`actions-box` = TRUE),
                        selected = "name")

    })
    output$fn<-renderPlotly({

            #2.2 MAKING A TABLE for public.exists
        tbl<-table(pe[[input$DB]], pe$sts)
            ggplotly(
                ggplot(as.data.frame(tbl), aes(!!sym(input$DB), Freq, fill = sts)) 
            )

    })

}

shinyApp(ui, server)