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Compatibility with dplyr

Source: vignettes/compat-dplyr.Rmd
compat-dplyr.Rmd

safeframe philosophy is to prevent you from accidentally losing valuable data, but to otherwise be totally transparent and not to interfere with your workflow.

One popular ecosystem for data science workflow is the tidyverse. We try to ensure decent safeframe compatibility with the tidyverse. All dplyr verbs are tested in the tests/test-compat-dplyr.R file.

library(safeframe)
library(dplyr)
#> 
#> Attaching package: 'dplyr'
#> The following objects are masked from 'package:stats':
#> 
#>     filter, lag
#> The following objects are masked from 'package:base':
#> 
#>     intersect, setdiff, setequal, union

x <- make_safeframe(
  cars,
  speed = "Miles per hour",
  dist = "Distance in miles"
)

head(x)
#> 
#> // safeframe object
#>   speed dist
#> 1     4    2
#> 2     4   10
#> 3     7    4
#> 4     7   22
#> 5     8   16
#> 6     9   10
#> 
#> tagged variables:
#>  speed - Miles per hour
#>  dist - Distance in miles

Verbs operating on rows

safeframe does not modify anything regarding the behaviour for row-operations. As such, it is fully compatible with dplyr verbs operating on rows out-of-the-box. You can see in the following examples that safeframe does not produce any errors, warnings or messspeeds and its tags are conserved through dplyr operations on rows.

dplyr::arrange() ✅ 

x %>%
  arrange(speed) %>%
  head()
#> 
#> // safeframe object
#>   speed dist
#> 1     4    2
#> 2     4   10
#> 3     7    4
#> 4     7   22
#> 5     8   16
#> 6     9   10
#> 
#> tagged variables:
#>  speed - Miles per hour
#>  dist - Distance in miles

dplyr:distinct() ✅ 

x %>%
  distinct() %>%
  head()
#> 
#> // safeframe object
#>   speed dist
#> 1     4    2
#> 2     4   10
#> 3     7    4
#> 4     7   22
#> 5     8   16
#> 6     9   10
#> 
#> tagged variables:
#>  speed - Miles per hour
#>  dist - Distance in miles

dplyr::filter() ✅ 

x %>%
  filter(speed >= 50) %>%
  head()
#> 
#> // safeframe object
#> [1] speed dist 
#> <0 rows> (or 0-length row.names)
#> 
#> tagged variables:
#>  speed - Miles per hour
#>  dist - Distance in miles

dplyr::slice() ✅ 

x %>%
  slice(5:10)
#> 
#> // safeframe object
#>   speed dist
#> 1     8   16
#> 2     9   10
#> 3    10   18
#> 4    10   26
#> 5    10   34
#> 6    11   17
#> 
#> tagged variables:
#>  speed - Miles per hour
#>  dist - Distance in miles

x %>%
  slice_head(n = 5)
#> 
#> // safeframe object
#>   speed dist
#> 1     4    2
#> 2     4   10
#> 3     7    4
#> 4     7   22
#> 5     8   16
#> 
#> tagged variables:
#>  speed - Miles per hour
#>  dist - Distance in miles

x %>%
  slice_tail(n = 5)
#> 
#> // safeframe object
#>   speed dist
#> 1    24   70
#> 2    24   92
#> 3    24   93
#> 4    24  120
#> 5    25   85
#> 
#> tagged variables:
#>  speed - Miles per hour
#>  dist - Distance in miles

x %>%
  slice_min(speed, n = 3)
#> 
#> // safeframe object
#>   speed dist
#> 1     4    2
#> 2     4   10
#> 3     7    4
#> 4     7   22
#> 
#> tagged variables:
#>  speed - Miles per hour
#>  dist - Distance in miles

x %>%
  slice_max(speed, n = 3)
#> 
#> // safeframe object
#>   speed dist
#> 1    25   85
#> 2    24   70
#> 3    24   92
#> 4    24   93
#> 5    24  120
#> 
#> tagged variables:
#>  speed - Miles per hour
#>  dist - Distance in miles

x %>%
  slice_sample(n = 5)
#> 
#> // safeframe object
#>   speed dist
#> 1    23   54
#> 2    14   80
#> 3    12   14
#> 4    19   46
#> 5    19   68
#> 
#> tagged variables:
#>  speed - Miles per hour
#>  dist - Distance in miles

Verbs operating on columns

During operations on columns, safeframe will:

  • stay invisible and conserve tags if no tagged column is affected by the operation
  • trigger lost_tags_action() if tagged columns are affected by the operation

dplyr::mutate() ✓ (partial)

There is an incomplete compatibility with dplyr::mutate() in that simple renames without any actual modification of the column don’t update the tags. In this scenario, users should rather use dplyr::rename()

Although dplyr::mutate() is not able to leverspeed to full power of safeframe tags, safeframe objects behave as expected the same way a data.frame would:

# In place modification doesn't lose tags
x %>%
  mutate(speed = speed + 10) %>%
  head()
#> 
#> // safeframe object
#>   speed dist
#> 1    14    2
#> 2    14   10
#> 3    17    4
#> 4    17   22
#> 5    18   16
#> 6    19   10
#> 
#> tagged variables:
#>  speed - Miles per hour
#>  dist - Distance in miles

# New columns don't affect existing tags
x %>%
  mutate(ticket = speed >= 50) %>%
  head()
#> 
#> // safeframe object
#>   speed dist ticket
#> 1     4    2  FALSE
#> 2     4   10  FALSE
#> 3     7    4  FALSE
#> 4     7   22  FALSE
#> 5     8   16  FALSE
#> 6     9   10  FALSE
#> 
#> tagged variables:
#>  speed - Miles per hour
#>  dist - Distance in miles

# .keep = "unused" generate expected tag loss conditions
x %>%
  mutate(edad = speed, .keep = "unused") %>%
  head()
#> Warning: The following tagged variables are lost:
#>  speed - Miles per hour
#> 
#> // safeframe object
#>   dist edad
#> 1    2    4
#> 2   10    4
#> 3    4    7
#> 4   22    7
#> 5   16    8
#> 6   10    9
#> 
#> tagged variables:
#>  dist - Distance in miles
#>  edad - Miles per hour

dplyr::pull() ✅

dplyr::pull() returns a vector, which results, as expected, in the loss of the safeframe class and tags:

x %>%
  pull(speed)
#>  [1]  4  4  7  7  8  9 10 10 10 11 11 12 12 12 12 13 13 13 13 14 14 14 14 15 15
#> [26] 15 16 16 17 17 17 18 18 18 18 19 19 19 20 20 20 20 20 22 23 24 24 24 24 25
#> attr(,"label")
#> [1] "Miles per hour"

dplyr::relocate() ✅ 

x %>%
  relocate(speed, .before = 1) %>%
  head()
#> 
#> // safeframe object
#>   speed dist
#> 1     4    2
#> 2     4   10
#> 3     7    4
#> 4     7   22
#> 5     8   16
#> 6     9   10
#> 
#> tagged variables:
#>  speed - Miles per hour
#>  dist - Distance in miles

dplyr::rename() & dplyr::rename_with() ✅

dplyr::rename() is fully compatible out-of-the-box with safeframe, meaning that tags will be updated at the same time that columns are renamed. This is possibly because it uses names<-() under the hood, which safeframe provides a custom names<-.safeframe() method for:

x %>%
  rename(edad = speed) %>%
  head()
#> 
#> // safeframe object
#>   edad dist
#> 1    4    2
#> 2    4   10
#> 3    7    4
#> 4    7   22
#> 5    8   16
#> 6    9   10
#> 
#> tagged variables:
#>  edad - Miles per hour
#>  dist - Distance in miles

x %>%
  rename_with(toupper) %>%
  head()
#> 
#> // safeframe object
#>   SPEED DIST
#> 1     4    2
#> 2     4   10
#> 3     7    4
#> 4     7   22
#> 5     8   16
#> 6     9   10
#> 
#> tagged variables:
#>  SPEED - Miles per hour
#>  DIST - Distance in miles

dplyr::select() ✅

dplyr::select() is fully compatible with safeframe, including when columns are renamed in a select():

# Works fine
x %>%
  select(speed, dist) %>%
  head()
#> 
#> // safeframe object
#>   speed dist
#> 1     4    2
#> 2     4   10
#> 3     7    4
#> 4     7   22
#> 5     8   16
#> 6     9   10
#> 
#> tagged variables:
#>  speed - Miles per hour
#>  dist - Distance in miles

# tags are updated!
x %>%
  select(dist, edad = speed) %>%
  head()
#> 
#> // safeframe object
#>   dist edad
#> 1    2    4
#> 2   10    4
#> 3    4    7
#> 4   22    7
#> 5   16    8
#> 6   10    9
#> 
#> tagged variables:
#>  dist - Distance in miles
#>  edad - Miles per hour

Verbs operating on groups ✘

Groups are not yet supported. Applying any verb operating on group to a safeframe will silently convert it back to a data.frame or tibble.

Verbs operating on data.frames

dplyr::bind_rows() ✅ 

dim(x)
#> [1] 50  2

dim(bind_rows(x, x))
#> [1] 100   2

dplyr::bind_cols() ✘

bind_cols() is currently incompatible with safeframe:

  • tags from the second element are lost
  • Warnings are produced about lost tags, even for tags that are not actually lost
bind_cols(
  suppressWarnings(select(x, speed)),
  suppressWarnings(select(x, dist))
) %>%
  head()
#> Warning: The following tagged variables are lost:
#>  speed - Miles per hour
#> Warning: The following tagged variables are lost:
#>  dist - Distance in miles
#> 
#> // safeframe object
#>   speed dist
#> 1     4    2
#> 2     4   10
#> 3     7    4
#> 4     7   22
#> 5     8   16
#> 6     9   10
#> 
#> tagged variables:
#>  speed - Miles per hour
#>  dist - Distance in miles

Joins ✘

Joins are currently not compatible with safeframe as tags from the second element are silently dropped.

full_join(
  suppressWarnings(select(x, speed, dist)),
  suppressWarnings(select(x, dist, speed))
) %>%
  head()
#> Joining with `by = join_by(speed, dist)`
#> Warning in full_join(suppressWarnings(select(x, speed, dist)), suppressWarnings(select(x, : Detected an unexpected many-to-many relationship between `x` and `y`.
#> ℹ Row 17 of `x` matches multiple rows in `y`.
#> ℹ Row 17 of `y` matches multiple rows in `x`.
#> ℹ If a many-to-many relationship is expected, set `relationship =
#>   "many-to-many"` to silence this warning.
#> 
#> // safeframe object
#>   speed dist
#> 1     4    2
#> 2     4   10
#> 3     7    4
#> 4     7   22
#> 5     8   16
#> 6     9   10
#> 
#> tagged variables:
#>  speed - Miles per hour
#>  dist - Distance in miles

Verbs operating on multiple columns

dplyr::pick() ✘

pick() makes tidyselect functions work in usually tidyselect-incompatible functions, such as:

x %>%
  dplyr::arrange(dplyr::pick(ends_with("loc"))) %>%
  head()
#> 
#> // safeframe object
#>   speed dist
#> 1     4    2
#> 2     4   10
#> 3     7    4
#> 4     7   22
#> 5     8   16
#> 6     9   10
#> 
#> tagged variables:
#>  speed - Miles per hour
#>  dist - Distance in miles

As such, we could expect it to work with safeframe custom tidyselect-like function: has_tag() but it’s not the case since pick() currently strips out all attributes, including the safeframe class and all tags. This unclassing is documented in ?pick:

pick() returns a data frame containing the selected columns for the current group.