ETS from fable package in R (can I do it with out tsibble)

I am trying to use ETS function from fable package (following this tutorial link). Ideally I would like to do it without using tsibble functionality. In particular I am trying to generate forecast:

library(tsibble)
library(fable)
library(tidyverse)

fit <- ETS(1:63)

forecast(fit, h =2)

returns error:

Error in UseMethod("forecast") : 
  no applicable method for 'forecast' applied to an object of class "c('mdl_defn', 'R6')"

another try

summary(fit)

also returns error

Error in object[[i]] : wrong arguments for subsetting an environment

So can I used it without full tsibble functionality? It was so simple with ARIMA from forecast package. If it is not possible without tsibble what would be the quickest way to cast it as tsibble data?

Solution

You need to use tsibbles, but it is very easy to do so.

library(tsibble)
library(fable)
library(tidyverse)

ts(1:63) %>%
  as_tsibble() %>%
  model(ETS(value)) %>%
  forecast(h=2)

#> # A fable: 2 x 4 [1]
#> # Key:     .model [1]
#>   .model     index value .distribution
#>   <chr>      <dbl> <dbl> <dist>       
#> 1 ETS(value)    64    64 N(64, 0)     
#> 2 ETS(value)    65    65 N(65, 0)

^{Created on 2020-02-19 by the reprex package (v0.3.0)}