Can't use forecast after reconcile

[ruqianchen]

The sample code here https://fabletools.tidyverts.org/reference/reconcile.html no longer works. When I ran it, I received the message " no applicable method for 'forecast'".

Details:

> library(fable)
> lung_deaths_agg <- as_tsibble(cbind(mdeaths, fdeaths)) %>%
+   aggregate_key(key, value = sum(value))
> 
> lung_deaths_agg %>%
+   model(lm = TSLM(value ~ trend() + season())) %>%
+   reconcile(lm = min_trace(lm)) %>% 
+   forecast()
Error in UseMethod("forecast") : 
  no applicable method for 'forecast' applied to an object of class "c('tbl_df', 'tbl', 'data.frame')"

Thanks!

[ruqianchen]

For reference, the intermediate step output is a tibble with no time column to use as index for the tsibble that forecast requires.

> lung_deaths_agg %>%
+   model(lm = TSLM(value ~ trend() + season())) %>%
+   reconcile(lm = min_trace(lm))
# A tibble: 3 × 2
  key          lm     
  <chr>        <model>
1 fdeaths      <TSLM> 
2 mdeaths      <TSLM> 
3 <aggregated> <TSLM> 

[mitchelloharawild]

I am unable to reproduce this issue, could you please check that your packages are up to date? If they are, please provide your session info with a reprex via reprex::reprex(si = TRUE).

library(fable)
#> Loading required package: fabletools
lung_deaths_agg <- as_tsibble(cbind(mdeaths, fdeaths)) %>%
   aggregate_key(key, value = sum(value))

lung_deaths_agg %>%
  model(lm = TSLM(value ~ trend() + season())) %>%
  reconcile(lm = min_trace(lm)) %>% 
  forecast()
#> Loading required namespace: crayon
#> # A fable: 72 x 5 [1M]
#> # Key:     key, .model [3]
#>    key     .model    index        value .mean
#>    <chr*>  <chr>     <mth>       <dist> <dbl>
#>  1 fdeaths lm     1980 Jan N(794, 5606)  794.
#>  2 fdeaths lm     1980 Feb N(778, 5606)  778.
#>  3 fdeaths lm     1980 Mar N(737, 5606)  737.
#>  4 fdeaths lm     1980 Apr N(577, 5606)  577.
#>  5 fdeaths lm     1980 May N(456, 5606)  456.
#>  6 fdeaths lm     1980 Jun N(386, 5606)  386.
#>  7 fdeaths lm     1980 Jul N(379, 5606)  379.
#>  8 fdeaths lm     1980 Aug N(335, 5606)  335.
#>  9 fdeaths lm     1980 Sep N(340, 5606)  340.
#> 10 fdeaths lm     1980 Oct N(413, 5606)  413.
#> # … with 62 more rows

^{Created on 2023-01-09 with reprex v2.0.2}

Session info

sessioninfo::session_info()
#> ─ Session info ───────────────────────────────────────────────────────────────
#>  setting  value
#>  version  R version 4.1.2 (2021-11-01)
#>  os       Ubuntu 20.04.4 LTS
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#>  ui       X11
#>  language en_AU:en
#>  collate  en_AU.UTF-8
#>  ctype    en_AU.UTF-8
#>  tz       Australia/Melbourne
#>  date     2023-01-09
#>  pandoc   2.19.2 @ /usr/lib/rstudio/bin/quarto/bin/tools/ (via rmarkdown)
#> 
#> ─ Packages ───────────────────────────────────────────────────────────────────
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#> ──────────────────────────────────────────────────────────────────────────────