and_or.yml

# This example workflow demonstrates how to use the `and` and `or` keywords to
# emulate the "if-else" functionality in many programming languages.
#
# See the YAQL docs for more details on the `and` and `or` operators:
# https://yaql.readthedocs.io/en/latest/standard_library.html#boolean-logic-functions


version: '2.0'  # you always need this key to specify version 2 of the mistral DSL

boolean_and_or:  # the name of the workflow can be anything, but Platform ignores it
  tasks:
    make_outputs:
      action: civis.scripts.python3
      input:
        name: make outputs
        # The code here creates a Python dict with boolean values and attaches
        # it to the job as a run output.
        source: |
          import civis
          import os
          import json

          client = civis.APIClient()
          json_val = client.json_values.post(
              json.dumps({ 'should_be_true': True,
                           'should_be_false': False }),
              name='result'
              )
          client.scripts.post_python3_runs_outputs(
              os.environ['CIVIS_JOB_ID'],
              os.environ['CIVIS_RUN_ID'],
              'JSONValue',
              json_val.id
              )
      publish:
        # The expression in `<%...%>` is YAQL with some Mistral extensions.
        #
        # The syntax `task().result` gets the results of the current task.
        #
        # The Civis mistral client attaches run outputs to the `outputs`
        # attribute of the result.
        #
        make_outputs_result: <% task().result.outputs[0].value %>
      on-success:
        - query_outputs

    query_outputs:
      action: civis.scripts.python3
      input:
        name: query_outputs
        # Now we are using the published task output and YAQL to conditionally
        # set some variables in Python.
        #
        # We use YAQL to query the run outputs. In YAQL, the `$` sign refers to
        # the specific "row" in the query. `.` is used to access attributes of
        # the row. YAQL is made to query nested data structures like the JSON
        # that we attached.
        #
        # The output of this job should be:
        #   should_be_true was set correctly
        #   should_be_false was set correctly
        #
        source: |
          sbt_msg = '<% $.make_outputs_result.should_be_true and 'set correctly' or 'False!' %>'
          sbf_msg = '<% $.make_outputs_result.should_be_false and 'True!' or 'set correctly' %>'

          print(f'should_be_true was {sbt_msg}')
          print(f'should_be_false was {sbf_msg}')