man_md/mandate.md

In mikejacktzen/datzen:

mandate: The mandate() function enforces a data.frame to follow a schema

Description

The mandate() function converts each column of the supplied data.frame to the type listed in the supplied schema. If the schema specs that data.frame column j should be numeric, then 'as.numeric(df[,j])' will be the result.

Usage

mandate(df, schema)

Arguments

Argument |Description ------------- |---------------- df | a data.frame whose column types and names will be mandated against a schema schema | a nested list containing schematics used to mandate the data.frame df argument

Details

the schema argument should be the output of scheme .

Value

an output data.frame similar to the input 'df' but the column types of 'df' may have been converted according to 'schema'

Seealso

scheme

Examples

```r iris2=cbind(iris,Species_chr=as.character(iris$Species)) save_df_schema(x=iris2,outdir='~/projects/datzen/tests/') schema_in = jsonlite::read_json('~/projects/datzen/tests/iris2_schema.json',simplifyVector = TRUE)

library(dplyr)

mandate(iris2,schema = schema_in) %>% str

iris3 = iris2 %>% mutate_all(.funs=funs(as.character)) iris3 %>% str

mandate(iris3,schema = schema_in) %>% str

```

mikejacktzen/datzen documentation built on June 14, 2019, 5:23 p.m.