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ayush_vipul's avatar
ayush_vipul
New Contributor III
7 years ago
Solved

Accessing one expression library functions from another expression lib

Hi I have a use case where I am looking forward to access methods of one library(expression file) from another library (expression file 2). Is their a way to achieve this?
expression_library
  • ayush_vipul's avatar
    ayush_vipul
    7 years ago

    Thanks @tstack

    This helped me a lot.
    😀

tstack's avatar
tstack
Former Employee
7 years ago

You should be able to reference the other library through the lib variable. Is that not working?

For example, if you this as the library helper.expr:

{
    chefify: x => x + ' bork! bork! bork!'
}

You should be able to reference it from another library, like so:

{
    msg: () => lib.helper.chefify('Hello, World!')
}

Note that if the references are not in functions, but directly in the top-level expression, you’ll need to ensure the libraries are listed in the right order in the pipeline properties.

ayush_vipul's avatar
ayush_vipul
New Contributor III
7 years ago

I have a use case where a child pipeline has multiple expr files.

I want to pass a value to the child pipeline using which my chiled pipeline would choose one of the expression library.
is there a way to do it ?

  • tstack's avatar
    tstack
    Former Employee
    7 years ago

    In the child pipeline properties, add a parameter that you’ll use to specify the library to load. Then, in the “Expression Libraries” section, add a path that uses the parameter you just created. You’ll probably also want to set the name of the imported library using the “As” column. In the screenshot below, the parameter is config and defaults to the library file dev.expr and the library can be referenced via lib.conf in expressions:

    In the parent pipeline, you’ll pass the config parameter with the library paths that you want. In the screenshot below, there are two documents entering the PipeExec with “dev.expr” and “prod.expr” as the paths. So, the child will execute first with the “dev” library and then with the “prod” library.