Change Column Case

It lets the user change the case of the column names.

This transformation expects user to provide below inputs:

Input Arguments	Mandatory	Default Value	Description
target-case-type	Yes	-	Supported case types (lower,upper,snake,kebab,camel,pascal)
source-case-type	No	lower	Supported case types (snake,kebab,camel,pascal)

Below is a quick helper chart to understand commonly used case types and their general usage

Input Arguments	Example	Usage
Camel	myVariableName	Used for variables, methods, and parameter names
Pascal	MyClassName	Used for class names and type names
Snake	my_variable_name	Used for variable names in some scripting languages
Kebab	my-variable-name	Used for configurations, file names, URLs, and command-line arguments

For example, consider we have below restonomer response in json:

{
  "col_a": "1",
  "COL_B": "2"
}

Now, as we know all these columns are in snake-case, suppose the requirement is to transform case of all columns to camel case.

Then, user can configure the ChangeColumnCase transformation in the below manner:

{
  type = "ChangeColumnCase"
  target-case-type = "camel"
  source-case-type = "snake"
}

The transformed response will now have the columns with the desired case type:

{
  "colA": "1",
  "colB": "2"
}

Remember that, for converting the case to "lower" or "upper" user need not give source-case-type as it will not matter for the conversion. However, for any other target case type user needs to provide an appropriate source-case-type. Otherwise, Restonomer will error out.