`margins()` not running for model of class bigglm

[rosemm]

I saw that bigglm is supported in prediction (thank you!), but I'm not able to run margins() on a bigglm model. Not sure if this is a bug or if I'm just doing something wrong here, but wanted to draw your attention to it in case it's a bug.

Please specify whether your issue is about:

• [x] a possible bug
• [ ] a question about package functionality
• [ ] a suggested code or documentation change, improvement to the code, or feature request

If you are reporting (1) a bug or (2) a question about code, please supply:

• a fully reproducible example using a publicly available dataset (or provide your data)
• if an error is occurring, include the output of traceback() run immediately after the error occurs
• the output of sessionInfo()

Put your code here:

## load package
library("margins")
library("biglm")

# model run with glm
a <- glm(am ~ hp, data = mtcars, family = binomial)
# same model run with bigglm
b <- bigglm(am ~ hp, data = mtcars, family = binomial(), chunksize=10, sandwich=TRUE)
margins(a) # works
margins(b) # stops on error (error text and traceback below)

Error in x$terms %||% attr(x, "terms") %||% stop("no terms component nor attribute") : 
  no terms component nor attribute
> traceback()
8: stop("no terms component nor attribute")
7: x$terms %||% attr(x, "terms") %||% stop("no terms component nor attribute")
6: terms.default(find_data(model))
5: terms(find_data(model))
4: find_terms_in_model.default(model, variables = variables)
3: find_terms_in_model(model, variables = variables)
2: margins.default(b)
1: margins(b)


b$terms # note that there is a terms component

## session info for your system
> sessionInfo()
R version 4.1.0 (2021-05-18)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Big Sur 11.6.5

Matrix products: default
LAPACK: /Library/Frameworks/R.framework/Versions/4.1/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] margins_0.3.26 biglm_0.9-2.1  DBI_1.1.1     

loaded via a namespace (and not attached):
 [1] Rcpp_1.0.7        pillar_1.6.2      compiler_4.1.0    tools_4.1.0      
 [5] digest_0.6.27     lubridate_1.7.10  evaluate_0.14     lifecycle_1.0.0  
 [9] tibble_3.1.4      gtable_0.3.0      pkgconfig_2.0.3   rlang_0.4.11     
[13] cli_3.0.1         rstudioapi_0.13   yaml_2.2.1        xfun_0.31        
[17] fastmap_1.1.0     dplyr_1.0.7       knitr_1.33        generics_0.1.0   
[21] vctrs_0.3.8       grid_4.1.0        tidyselect_1.1.1  data.table_1.14.0
[25] glue_1.4.2        R6_2.5.1          fansi_0.5.0       prediction_0.3.14
[29] rmarkdown_2.14    ggplot2_3.3.5     purrr_0.3.4       magrittr_2.0.1   
[33] MASS_7.3-54       scales_1.1.1      ellipsis_0.3.2    htmltools_0.5.2  
[37] assertthat_0.2.1  colorspace_2.0-2  utf8_1.2.2        munsell_0.5.0    
[41] crayon_1.4.1