Create Logic and Modify Mapping Data Using Liquid Markup Language

It is sometimes necessary to modify data before mapping the data. In EvOps, Liquid Markup Language is used for reformatting, reconstructing, and changing data based on logic before providing it as input.

There are three main features of the Liquid markup language; Objects, Tags, and Filters.

Objects

Objects are data variables that are populated by users' properties, prompts, and workflow activity output. These objects are wrapped in double curly brace delimiters {{ }}, and look like this:

{{userInput.promptResourceGroup.name}}

In the above example, userInput indicates that its prompt output data, promptResourceGroup, is the prompt id. These combined is the object, name is a property of that object. Each object has a list of associated properties.

Tags

Tags are used to create logic and control flow for mappings. The curly brace percentage delimiters {% %} and the text that they surround does not produce any visible output. This lets you assign variables and create conditions.

For example, you can map different data depending on prompt selections:

{% if {{userInput.purpose.value}} == 'Prd' %}
{{userInput.classification.value}}
{% else %}
None
{% endif %}

If the userInput.purpose.value is not equal to Prd, then the output will be:

None

The above example uses if and else tags, which are control flow tags.

Liquid tags are categorized into various types. Se links below for more examples:

• Control flow tags
• Iteration tags
• Theme tags
• Variable tags

Filters

Filters are used to modify the output of numbers, strings, objects, and variables. They are placed within an output tag {{ }}, and are denoted by a pipe character |.

An example is the capitalize string filter:

{{ userInput.firstname.value | capitalize}}

Above filter modifies the string object by changing the first character to uppercase.

Multiple filters can be used on one output, and they are applied from left to right:

{{ userInput.firstname.value | downcase | capitalize }}

Above filter modifies the entire string object to lowercase and after that changes first character to uppercase.

See this link for all String filters that can be used to manipulate outputs of string type:
String Filter Reference Link

TIP: You can also use verify your code in the online editor here.