json_pack.md
In dm: Relational Data Models

`json_pack()` works

Code
  df <- tibble::tibble(x1 = 1:3, x2 = 4:6, x3 = 7:9, y = 1:3)
  packed <- json_pack(df, x = c(x1, x2, x3), y = y)
  packed
Output
  # A tibble: 3 x 2
    x                              y          
    <chr>                          <chr>      
  1 "{\"x1\":1,\"x2\":4,\"x3\":7}" "{\"y\":1}"
  2 "{\"x1\":2,\"x2\":5,\"x3\":8}" "{\"y\":2}"
  3 "{\"x1\":3,\"x2\":6,\"x3\":9}" "{\"y\":3}"