This workbook is designed to accompany section 209 - Child Flows.


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Exercise 209-1 - A Basic Child Flow

Let’s do an easy example of a Function or Subroutine (a Helper Flow, in other words) …

Perhaps we are doing a Marketing campaign and want to reach only our Twitter followers in a particular location or area and are active.

NOTE: This Flow won’t be fully complete … we’re just demonstrating how to call a Child Flow.

To create this Child Flow:

  • Create a New Flow
  • Name the Flow: “209- 1 - Twitter - Location Match Child Flow”
  • Select “Child Flow” as your Event
  • Add “Username” and “Location” as the input fields
  • Select the Twitter >> Get User Profile Card
  • Add an If/Else card
    • Conditions: Location = Location
    • If true, return location_match = True (True/False)
    • If false, return location_match = False (True/False)
  • Save the Card

Create a new Flow which calls the Child Flow:

  • Create a New Flow
  • Name the Flow: “209- 1 - Twitter Location Check”
  • Add an Assign Card
    • Field: Location
    • Value = “Seattle, WA”
    • Field: Username
    • Value = “azuqua”
  • Add a “Call Flow” card
  • Select the Flow: “209- 1 - Twitter - Location Match Child Flow”
  • Drag the Username and Location fields to the appropriate fields that appear

While this is a rather basic Child Flow, it shows how we can pass information back and forth easily!

Exercise 209-2 - Looping (the “For Each” Card)

Most Flowgrammers quickly learn the need for operations which “loop”. Let’s take an example of this …

Perhaps I have a list of contacts and I want to traverse this list and send an email to every person on that list. Within a Flow, this would be a “For Each” action.

Here, we’re going to do the following: Take a ;ist of contacts and traverse this list and send an email to people that match a criterial on this list.

  • Create new Flow
    • Narrative: First, let’s create a new (Parent) Flow
    • Use a “Construct” card to create a list of text (email addresses)
    • Add four fields for email addresses and add them
    • Add a “List >> For Each” card to call the Child Flow
    • Click the button to create a new Child Flow
    • Drag the “list” output from the List >> Construct card to your “List >> For Each” card
  • Create the new Child Flow
    • Now, let’s jump over to the Child Flow. The parent is not quite finished, but we need to configure and test our Child card
    • Set the inputs
    • In this case: Email address
      • This is an important key in working with Child Flows!
      • They come directly from the item that is being processed, so if the object you’re processing has field X and Y, you’ll need to add those here.
    • We want to send email to people on this list, so we’ll take each email - one at a time - and do something with them.
    • Step 1: Add a “Text >> Find” Card
      • Add the Text >> Find Card
      • Look In: email (Drag email over to this field)
      • Look for: “”
    • Step 2: Add a “Branching >> Continue If” card
      • Set “Value a” = “position”
      • Drag this from the output of the Text >> Find card
      • Set “Comparison” equal to -1 (value b)
      • NOTE This will filter out anyone with the “” domain
    • Step 3: Add a “Text >> Compose” Card
      • Craft a message that you’ll want someone to read
      • Drag the email field from the first card as the email
    • Step 4: Add an email card
      • NOTE This depends on your email client. If you have Gmail, use the “Gmail >> Send Email” card!
      • For Testing, we suggest using your email in the “To” line
      • Add a Subject of your choice
      • Drag the output from the “Text >> Compose card”
    • Save the child Flow and turn it on

Important: Note that this whole idea of child Flow is that you can do as many steps as you need on each item – one at a time.

Go back to the parent Flow and complete it … Note that the “email” field that we created in the Child Flow **now appears as an item in the “With the following values” section!

  • Make sure the Child Flow you created is selected
    • e.g. “209-2 - Looping - Child Flow”
    • Select the email drop-down and choose “item”
  • Save the Flow
  • Run the Flow

Your Flow should look as follows …

Now run the Flow and make sure you’re getting the correct output.