Graph is not appearing - r

Question

I am trying to create a graph where I am can view total flights by year, filtered by origin and its destination.
Picture1: What I envision VS Picture2: The result.
Problem 1: Graph unable to appear on shinyApp.
Problem 2: When the graph appears, the graph does not change even when I select a different Origin from the dropdown box
I am quite new to shiny, any help would be greatly appreciated! The data I am using is from Harvard database- data expo 2009, Airline on time data.
library(DBI)
library(ggplot2)
library(dplyr)
library(RSQLite)
#q3 data from sql
q3m <- dbGetQuery(conn, "
SELECT Year, Origin, Dest, COUNT(FlightNum) AS Total
FROM ontime
WHERE Cancelled = 0 AND Diverted = 0
GROUP BY Origin,Dest,Year
")
q3m
#ggplot
q3plot <- ggplot(q3m) +
geom_col(aes(x= Year, y = Total))+
scale_x_discrete(limits = c(2000,2001)) +
facet_wrap(~Dest) +
labs(title = paste(q3m$Origin , "to" ) , x = "Year", y = "Total Flights") +
geom_text(aes(x = Year, y = Total, label = Total), vjust = 1.5, size = 3.5, color = "white")
q3plot
SHINY
library(shiny)
server <- function(input,output, session) {
#data
data <- reactive({
req(input$sel_q3)
q3m
})
#plot
output$plot <- renderPlot({
q3plot <- ggplot(data(),aes(x= Year, y = Total)) + scale_x_discrete(limits = c(2000,2001)) +
facet_wrap(~Dest) +
geom_col()
})
#update dynamically
observe({
updateSelectInput(session, "sel_q3", choices = q3m$Origin)
})
}
ui <- fluidPage(
h1("Comparison of total flights of airport"),
selectInput(inputId = "sel_q3",
label = "Select your airport",
"Names"),
plotOutput("plot")
)
shinyApp(ui=ui, server = server)
SHINY shows graph but the graph does not change
What i did was just put q3plot into output$plot instead of retyping ggplot
server <- function(input,output, session) {
#data
data <- reactive({
req(input$sel_q3)
q3m
})
#plot
output$plot <- renderPlot({
q3plot
})
#update dynamically
observe({
updateSelectInput(session, "sel_q3", choices = q3m$Origin)
})
}
ui <- fluidPage(
h1("Comparison of total flights of airport"),
selectInput(inputId = "sel_q3",
label = "Select your airport",
"Names"),
plotOutput("plot")
)
shinyApp(ui=ui, server = server)

Answer 1

Thanks to #MrFlick
The solution if anyone faces the same issue is basically adding the proper filtering
#data
data <- reactive({
req(input$sel_q3)
df <- q3m %>% filter(Origin %in% inputsel_q3) # <- this is the fix
})
#plot
output$plot <- renderPlot({
ggplot(data(),aes(x,y)) + geomcol()
})