Once you have all your primary keys set and all foreign key relations defined, a graphical representation of your data model offers a condensed view of the tables and the relationships between the tables. The following functions can be used to visualize the `dm`

object:^{1}

We use the prepared example `dm`

object `dm_nycflights13(cycle = TRUE)`

:

```
library(dm)
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
flights_dm_w_many_keys <- dm_nycflights13(color = FALSE)
flights_dm_w_many_keys
```

```
#> ── Metadata ───────────────────────────────────────────────────────────────
#> Tables: `airlines`, `airports`, `flights`, `planes`, `weather`
#> Columns: 53
#> Primary keys: 3
#> Foreign keys: 3
```

The schema is drawn with `dm_draw()`

.

`dm_draw(flights_dm_w_many_keys)`

You can use colors to visually group your tables into families to reflect their logical grouping. The available colors are either hexcoded colors or the standard R color names. The function `dm_get_available_colors()`

forwards to `grDevices::colors()`

:

```
dm_get_available_colors()
#> [1] "default" "white" "aliceblue"
#> [4] "antiquewhite" "antiquewhite1" "antiquewhite2"
#> [7] "antiquewhite3" "antiquewhite4" "aquamarine"
#> [10] "aquamarine1" "aquamarine2" "aquamarine3"
#> [13] "aquamarine4" "azure" "azure1"
#> [16] "azure2" "azure3" "azure4"
#> [19] "beige" "bisque" "bisque1"
#> [22] "bisque2" "bisque3" "bisque4"
#> [25] "black" "blanchedalmond" "blue"
#> [28] "blue1" "blue2" "blue3"
#> [31] "blue4" "blueviolet" "brown"
#> [34] "brown1" "brown2" "brown3"
#> [37] "brown4" "burlywood" "burlywood1"
#> [40] "burlywood2" "burlywood3" "burlywood4"
#> [43] "cadetblue" "cadetblue1" "cadetblue2"
#> [46] "cadetblue3" "cadetblue4" "chartreuse"
#> [49] "chartreuse1" "chartreuse2" "chartreuse3"
#> [52] "chartreuse4" "chocolate" "chocolate1"
#> [55] "chocolate2" "chocolate3" "chocolate4"
#> [58] "coral" "coral1" "coral2"
#> [61] "coral3" "coral4" "cornflowerblue"
#> [64] "cornsilk" "cornsilk1" "cornsilk2"
#> [67] "cornsilk3" "cornsilk4" "cyan"
#> [70] "cyan1" "cyan2" "cyan3"
#> [73] "cyan4" "darkblue" "darkcyan"
#> [76] "darkgoldenrod" "darkgoldenrod1" "darkgoldenrod2"
#> [79] "darkgoldenrod3" "darkgoldenrod4" "darkgray"
#> [82] "darkgreen" "darkgrey" "darkkhaki"
#> [85] "darkmagenta" "darkolivegreen" "darkolivegreen1"
#> [88] "darkolivegreen2" "darkolivegreen3" "darkolivegreen4"
#> [91] "darkorange" "darkorange1" "darkorange2"
#> [94] "darkorange3" "darkorange4" "darkorchid"
#> [97] "darkorchid1" "darkorchid2" "darkorchid3"
#> [100] "darkorchid4" "darkred" "darksalmon"
#> [103] "darkseagreen" "darkseagreen1" "darkseagreen2"
#> [106] "darkseagreen3" "darkseagreen4" "darkslateblue"
#> [109] "darkslategray" "darkslategray1" "darkslategray2"
#> [112] "darkslategray3" "darkslategray4" "darkslategrey"
#> [115] "darkturquoise" "darkviolet" "deeppink"
#> [118] "deeppink1" "deeppink2" "deeppink3"
#> [121] "deeppink4" "deepskyblue" "deepskyblue1"
#> [124] "deepskyblue2" "deepskyblue3" "deepskyblue4"
#> [127] "dimgray" "dimgrey" "dodgerblue"
#> [130] "dodgerblue1" "dodgerblue2" "dodgerblue3"
#> [133] "dodgerblue4" "firebrick" "firebrick1"
#> [136] "firebrick2" "firebrick3" "firebrick4"
#> [139] "floralwhite" "forestgreen" "gainsboro"
#> [142] "ghostwhite" "gold" "gold1"
#> [145] "gold2" "gold3" "gold4"
#> [148] "goldenrod" "goldenrod1" "goldenrod2"
#> [151] "goldenrod3" "goldenrod4" "gray"
#> [154] "gray0" "gray1" "gray2"
#> [157] "gray3" "gray4" "gray5"
#> [160] "gray6" "gray7" "gray8"
#> [163] "gray9" "gray10" "gray11"
#> [166] "gray12" "gray13" "gray14"
#> [169] "gray15" "gray16" "gray17"
#> [172] "gray18" "gray19" "gray20"
#> [175] "gray21" "gray22" "gray23"
#> [178] "gray24" "gray25" "gray26"
#> [181] "gray27" "gray28" "gray29"
#> [184] "gray30" "gray31" "gray32"
#> [187] "gray33" "gray34" "gray35"
#> [190] "gray36" "gray37" "gray38"
#> [193] "gray39" "gray40" "gray41"
#> [196] "gray42" "gray43" "gray44"
#> [199] "gray45" "gray46" "gray47"
#> [202] "gray48" "gray49" "gray50"
#> [205] "gray51" "gray52" "gray53"
#> [208] "gray54" "gray55" "gray56"
#> [211] "gray57" "gray58" "gray59"
#> [214] "gray60" "gray61" "gray62"
#> [217] "gray63" "gray64" "gray65"
#> [220] "gray66" "gray67" "gray68"
#> [223] "gray69" "gray70" "gray71"
#> [226] "gray72" "gray73" "gray74"
#> [229] "gray75" "gray76" "gray77"
#> [232] "gray78" "gray79" "gray80"
#> [235] "gray81" "gray82" "gray83"
#> [238] "gray84" "gray85" "gray86"
#> [241] "gray87" "gray88" "gray89"
#> [244] "gray90" "gray91" "gray92"
#> [247] "gray93" "gray94" "gray95"
#> [250] "gray96" "gray97" "gray98"
#> [253] "gray99" "gray100" "green"
#> [256] "green1" "green2" "green3"
#> [259] "green4" "greenyellow" "grey"
#> [262] "grey0" "grey1" "grey2"
#> [265] "grey3" "grey4" "grey5"
#> [268] "grey6" "grey7" "grey8"
#> [271] "grey9" "grey10" "grey11"
#> [274] "grey12" "grey13" "grey14"
#> [277] "grey15" "grey16" "grey17"
#> [280] "grey18" "grey19" "grey20"
#> [283] "grey21" "grey22" "grey23"
#> [286] "grey24" "grey25" "grey26"
#> [289] "grey27" "grey28" "grey29"
#> [292] "grey30" "grey31" "grey32"
#> [295] "grey33" "grey34" "grey35"
#> [298] "grey36" "grey37" "grey38"
#> [301] "grey39" "grey40" "grey41"
#> [304] "grey42" "grey43" "grey44"
#> [307] "grey45" "grey46" "grey47"
#> [310] "grey48" "grey49" "grey50"
#> [313] "grey51" "grey52" "grey53"
#> [316] "grey54" "grey55" "grey56"
#> [319] "grey57" "grey58" "grey59"
#> [322] "grey60" "grey61" "grey62"
#> [325] "grey63" "grey64" "grey65"
#> [328] "grey66" "grey67" "grey68"
#> [331] "grey69" "grey70" "grey71"
#> [334] "grey72" "grey73" "grey74"
#> [337] "grey75" "grey76" "grey77"
#> [340] "grey78" "grey79" "grey80"
#> [343] "grey81" "grey82" "grey83"
#> [346] "grey84" "grey85" "grey86"
#> [349] "grey87" "grey88" "grey89"
#> [352] "grey90" "grey91" "grey92"
#> [355] "grey93" "grey94" "grey95"
#> [358] "grey96" "grey97" "grey98"
#> [361] "grey99" "grey100" "honeydew"
#> [364] "honeydew1" "honeydew2" "honeydew3"
#> [367] "honeydew4" "hotpink" "hotpink1"
#> [370] "hotpink2" "hotpink3" "hotpink4"
#> [373] "indianred" "indianred1" "indianred2"
#> [376] "indianred3" "indianred4" "ivory"
#> [379] "ivory1" "ivory2" "ivory3"
#> [382] "ivory4" "khaki" "khaki1"
#> [385] "khaki2" "khaki3" "khaki4"
#> [388] "lavender" "lavenderblush" "lavenderblush1"
#> [391] "lavenderblush2" "lavenderblush3" "lavenderblush4"
#> [394] "lawngreen" "lemonchiffon" "lemonchiffon1"
#> [397] "lemonchiffon2" "lemonchiffon3" "lemonchiffon4"
#> [400] "lightblue" "lightblue1" "lightblue2"
#> [403] "lightblue3" "lightblue4" "lightcoral"
#> [406] "lightcyan" "lightcyan1" "lightcyan2"
#> [409] "lightcyan3" "lightcyan4" "lightgoldenrod"
#> [412] "lightgoldenrod1" "lightgoldenrod2" "lightgoldenrod3"
#> [415] "lightgoldenrod4" "lightgoldenrodyellow" "lightgray"
#> [418] "lightgreen" "lightgrey" "lightpink"
#> [421] "lightpink1" "lightpink2" "lightpink3"
#> [424] "lightpink4" "lightsalmon" "lightsalmon1"
#> [427] "lightsalmon2" "lightsalmon3" "lightsalmon4"
#> [430] "lightseagreen" "lightskyblue" "lightskyblue1"
#> [433] "lightskyblue2" "lightskyblue3" "lightskyblue4"
#> [436] "lightslateblue" "lightslategray" "lightslategrey"
#> [439] "lightsteelblue" "lightsteelblue1" "lightsteelblue2"
#> [442] "lightsteelblue3" "lightsteelblue4" "lightyellow"
#> [445] "lightyellow1" "lightyellow2" "lightyellow3"
#> [448] "lightyellow4" "limegreen" "linen"
#> [451] "magenta" "magenta1" "magenta2"
#> [454] "magenta3" "magenta4" "maroon"
#> [457] "maroon1" "maroon2" "maroon3"
#> [460] "maroon4" "mediumaquamarine" "mediumblue"
#> [463] "mediumorchid" "mediumorchid1" "mediumorchid2"
#> [466] "mediumorchid3" "mediumorchid4" "mediumpurple"
#> [469] "mediumpurple1" "mediumpurple2" "mediumpurple3"
#> [472] "mediumpurple4" "mediumseagreen" "mediumslateblue"
#> [475] "mediumspringgreen" "mediumturquoise" "mediumvioletred"
#> [478] "midnightblue" "mintcream" "mistyrose"
#> [481] "mistyrose1" "mistyrose2" "mistyrose3"
#> [484] "mistyrose4" "moccasin" "navajowhite"
#> [487] "navajowhite1" "navajowhite2" "navajowhite3"
#> [490] "navajowhite4" "navy" "navyblue"
#> [493] "oldlace" "olivedrab" "olivedrab1"
#> [496] "olivedrab2" "olivedrab3" "olivedrab4"
#> [499] "orange" "orange1" "orange2"
#> [502] "orange3" "orange4" "orangered"
#> [505] "orangered1" "orangered2" "orangered3"
#> [508] "orangered4" "orchid" "orchid1"
#> [511] "orchid2" "orchid3" "orchid4"
#> [514] "palegoldenrod" "palegreen" "palegreen1"
#> [517] "palegreen2" "palegreen3" "palegreen4"
#> [520] "paleturquoise" "paleturquoise1" "paleturquoise2"
#> [523] "paleturquoise3" "paleturquoise4" "palevioletred"
#> [526] "palevioletred1" "palevioletred2" "palevioletred3"
#> [529] "palevioletred4" "papayawhip" "peachpuff"
#> [532] "peachpuff1" "peachpuff2" "peachpuff3"
#> [535] "peachpuff4" "peru" "pink"
#> [538] "pink1" "pink2" "pink3"
#> [541] "pink4" "plum" "plum1"
#> [544] "plum2" "plum3" "plum4"
#> [547] "powderblue" "purple" "purple1"
#> [550] "purple2" "purple3" "purple4"
#> [553] "red" "red1" "red2"
#> [556] "red3" "red4" "rosybrown"
#> [559] "rosybrown1" "rosybrown2" "rosybrown3"
#> [562] "rosybrown4" "royalblue" "royalblue1"
#> [565] "royalblue2" "royalblue3" "royalblue4"
#> [568] "saddlebrown" "salmon" "salmon1"
#> [571] "salmon2" "salmon3" "salmon4"
#> [574] "sandybrown" "seagreen" "seagreen1"
#> [577] "seagreen2" "seagreen3" "seagreen4"
#> [580] "seashell" "seashell1" "seashell2"
#> [583] "seashell3" "seashell4" "sienna"
#> [586] "sienna1" "sienna2" "sienna3"
#> [589] "sienna4" "skyblue" "skyblue1"
#> [592] "skyblue2" "skyblue3" "skyblue4"
#> [595] "slateblue" "slateblue1" "slateblue2"
#> [598] "slateblue3" "slateblue4" "slategray"
#> [601] "slategray1" "slategray2" "slategray3"
#> [604] "slategray4" "slategrey" "snow"
#> [607] "snow1" "snow2" "snow3"
#> [610] "snow4" "springgreen" "springgreen1"
#> [613] "springgreen2" "springgreen3" "springgreen4"
#> [616] "steelblue" "steelblue1" "steelblue2"
#> [619] "steelblue3" "steelblue4" "tan"
#> [622] "tan1" "tan2" "tan3"
#> [625] "tan4" "thistle" "thistle1"
#> [628] "thistle2" "thistle3" "thistle4"
#> [631] "tomato" "tomato1" "tomato2"
#> [634] "tomato3" "tomato4" "turquoise"
#> [637] "turquoise1" "turquoise2" "turquoise3"
#> [640] "turquoise4" "violet" "violetred"
#> [643] "violetred1" "violetred2" "violetred3"
#> [646] "violetred4" "wheat" "wheat1"
#> [649] "wheat2" "wheat3" "wheat4"
#> [652] "whitesmoke" "yellow" "yellow1"
#> [655] "yellow2" "yellow3" "yellow4"
#> [658] "yellowgreen"
```

Colors are assigned with `dm_set_colors()`

using syntax known in the {tidyverse} as {tidyselect}-syntax, here in the form: `color = table`

. `select_helper`

functions are supported. The result of `dm_set_colors()`

is a `dm`

object. The information about the color is stored together with the rest of the metadata.

```
flights_dm_w_many_keys_and_colors <-
flights_dm_w_many_keys %>%
dm_set_colors(
maroon4 = flights,
orange = starts_with("air"),
"#5986C4" = planes
)
```

Draw the schema with `dm_draw()`

.

`dm_draw(flights_dm_w_many_keys_and_colors)`

The colors can be queried with `dm_get_colors()`

.

```
dm_get_colors(flights_dm_w_many_keys_and_colors)
#> #FFA500FF #FFA500FF #8B1C62FF #5986C4FF default
#> "airlines" "airports" "flights" "planes" "weather"
```

See the documentation for `dm_draw()`

for further options. One important argument is `view_type`

. Besides the default `"keys_only"`

, it accepts `"all"`

to display all columns, and `"title_only"`

to show only the title of the table.

```
flights_dm_w_many_keys_and_colors %>%
dm_draw(view_type = "title_only")
```

If you would like to visualize only a some of the tables, use `dm_select_tbl()`

before drawing:

```
flights_dm_w_many_keys_and_colors %>%
dm_select_tbl(flights, airports, planes) %>%
dm_draw()
```

The code for the functions in this section is borrowed from the {datamodelr} package.↩︎