Plot doesn't render if stringsAsFactors = FALSE

[lazappi]

Hi

I had a user report this issue lazappi/clustree#36. After looking into it a bit a think it might be a problem with ggraph.

Here is a reprex with an example from one of the vignettes.

library(ggraph)
#> Loading required package: ggplot2
library(tidygraph)
#> 
#> Attaching package: 'tidygraph'
#> The following object is masked from 'package:stats':
#> 
#>     filter

set_graph_style(plot_margin = margin(1,1,1,1))
graph <- as_tbl_graph(highschool)

# Not specifying the layout - defaults to "auto"
plot <- ggraph(graph) + 
    geom_edge_link(aes(colour = factor(year))) + 
    geom_node_point()
#> Using `nicely` as default layout
plot

That works fine but if we set options(stringsAsFactors = FALSE) first there is an error when rendering the plot.

options(stringsAsFactors = FALSE)
plot
#> Error in pathAttr(data, length(unique(data$group))): Not compatible with requested type: [type=character; target=integer].

I'm guessing somewhere something that should be a factor isn't (probably related to the edge colour) but I'm not sure where.

sessioninfo::session_info()
#> ─ Session info ──────────────────────────────────────────────────────────
#>  setting  value                       
#>  version  R version 3.6.0 (2019-04-26)
#>  os       macOS Sierra 10.12.6        
#>  system   x86_64, darwin15.6.0        
#>  ui       X11                         
#>  language (EN)                        
#>  collate  en_AU.UTF-8                 
#>  ctype    en_AU.UTF-8                 
#>  tz       Australia/Melbourne         
#>  date     2019-08-15                  
#> 
#> ─ Packages ──────────────────────────────────────────────────────────────
#>  package     * version    date       lib source                      
#>  assertthat    0.2.1      2019-03-21 [2] CRAN (R 3.6.0)              
#>  cli           1.1.0      2019-03-19 [2] CRAN (R 3.6.0)              
#>  colorspace    1.4-1      2019-03-18 [2] CRAN (R 3.6.0)              
#>  crayon        1.3.4      2017-09-16 [2] CRAN (R 3.6.0)              
#>  digest        0.6.20     2019-07-04 [2] CRAN (R 3.6.0)              
#>  dplyr         0.8.3      2019-07-04 [2] CRAN (R 3.6.0)              
#>  evaluate      0.14       2019-05-28 [2] CRAN (R 3.6.0)              
#>  farver        1.1.0      2018-11-20 [2] CRAN (R 3.6.0)              
#>  ggforce       0.3.0      2019-08-09 [2] CRAN (R 3.6.0)              
#>  ggplot2     * 3.2.1      2019-08-10 [2] CRAN (R 3.6.0)              
#>  ggraph      * 1.0.2      2018-07-07 [2] CRAN (R 3.6.0)              
#>  ggrepel       0.8.1      2019-05-07 [2] CRAN (R 3.6.0)              
#>  glue          1.3.1      2019-03-12 [2] CRAN (R 3.6.0)              
#>  gridExtra     2.3        2017-09-09 [2] CRAN (R 3.6.0)              
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#>  pkgconfig     2.0.2      2018-08-16 [2] CRAN (R 3.6.0)              
#>  plyr          1.8.4      2016-06-08 [2] CRAN (R 3.6.0)              
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#>  R6            2.4.0      2019-02-14 [2] CRAN (R 3.6.0)              
#>  Rcpp          1.0.2      2019-07-25 [2] CRAN (R 3.6.0)              
#>  rlang         0.4.0.9000 2019-07-09 [1] Github (r-lib/rlang@c375d5b)
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#>  sessioninfo   1.1.1      2018-11-05 [2] CRAN (R 3.6.0)              
#>  stringi       1.4.3      2019-03-12 [2] CRAN (R 3.6.0)              
#>  stringr       1.4.0      2019-02-10 [2] CRAN (R 3.6.0)              
#>  tibble        2.1.3      2019-06-06 [1] CRAN (R 3.6.0)              
#>  tidygraph   * 1.1.2      2019-02-18 [2] CRAN (R 3.6.0)              
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#>  viridis       0.5.1      2018-03-29 [2] CRAN (R 3.6.0)              
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#>  xfun          0.8        2019-06-25 [2] CRAN (R 3.6.0)              
#>  yaml          2.2.0      2018-07-25 [2] CRAN (R 3.6.0)              
#> 
#> [1] /Users/luke.zappia/Library/R/3.6-devel/library
#> [2] /Library/Frameworks/R.framework/Versions/3.6/Resources/library

^{Created on 2019-08-15 by the reprex package (v0.3.0)}