Update datatable with selectInput and insert to the database - r

Question

Trying to use selectInput in a form.
the choices are fetched from a collection in mongodB.
when user
completes the form and submits (which inserts to another collection
in mongo), data in selectInput is not captured.
tried to make it reactive or use observeEvent /updateSelectInput in the server but could not make it work.
here is the entire code:
library(shiny)
library(mongolite)
library(jsonlite)
# which fields get saved
fieldsAll <- c("Name", "selectOne", "tags")
saveData <- function(data) {
# Connect to the database
}
# load all responses into a data.frame
loadData <- function() {
# Connect to the database
}
fetchData <- function() {
# Connect to the database
}
shinyApp(
ui = tagList(
navbarPage(
tabPanel("Technology",
sidebarPanel(
textInput("Name",label ='Name:'),
selectInput('selectOne',
label ='Select One:',
choices=head(fetchData()),
selected = "",
multiple = FALSE),
selectizeInput("tags", "Tags:", NULL, multiple = TRUE, options=list(create=TRUE)),
actionButton("submit", "Submit", class = "btn-primary")
),
mainPanel(
tabsetPanel(
tabPanel("Table",
uiOutput("adminPanelContainer")
)
)
)
)
)
),
server = function(input, output, session) {
formData <- reactive({
fieldsAll
data <- sapply(fieldsAll, function(x) input[[x]])
data <- t(data)
data
})
observeEvent(input$submit, {
saveData(formData())
},
)
# render the admin panel
output$adminPanelContainer <- renderUI({
DT::dataTableOutput("responsesTable")
})
# Update the responses table whenever a new submission is made
responses_data <- reactive({
input$submit
data <- loadData()
data
})
# Show the responses in the admin table
output$responsesTable <- DT::renderDataTable({
DT::datatable(
responses_data(),
rownames = FALSE,
options = list(searching = TRUE, lengthChange = FALSE)
)
})
}
)

Answer 1

adding a column to the df with selected value worked:
formData <- reactive({
fieldsAll
data <- sapply(fieldsAll, function(x) input[[x]])
data <- c(data,selectOne= input$selectOne) #added line
data <- t(data)
data
})