How to pass user input from RM Server Web App to a Process?

Christos_KarapapasChristos_Karapapas Member Posts: 25 Contributor II
edited November 2019 in Help
I am following the Titanic example from the documentation and so far I made the following steps but I have a couple of questions.
1. Created a realm.
2. Created a few domains.
3. Assigned the realm to my web app.
4. Checked the "Allow processes to set app variables via context macros" option in my web app.
5. Created a User Input component in the layout of my web app.
6. Created some variables based on my domains.
7. Assigned the variables to the User Input component and marked them as selected variables.
8. Submitted the component, saved the web app and restart the RM Server.
9. Checked the view Context panel on RM Studio.
10. Created some macros with names identical to the names of my variables and default value 0.
11. Inserted the "Recall from App" operator to my process.
--- So far so good.
Now I suppose I have to select something in the Recall operator.
However, all I see as options is a name "meta_something" that I am using as name in another process' "Publish to App" operator.
What exactly I am supposed to see as options, is it the macros that I just created in the context?
Also after I complete some task with the user input, I need to send the results back to the web app, so I will also use the Publish operator to my process, is it this name that I am supposed to find under the Recall operator?
What am I missing here? Thank you in advance.

Best Answer


  • Edin_KlapicEdin_Klapic Moderator, Employee, RMResearcher, Member Posts: 299 RM Data Scientist
    Hi @chris_skg ,
    Welcome in the RapidMiner community!
    As a first remark let me tell you that restarting the Server is not necessary when working with Web Apps.

    Based on your explanation I would like to point you to some resources where the general approach of creating a Web App are explained in more detail:
    1. Our documentation on Web Apps which can be found on
    2. A Youtube video posted by a user which can be found on
    Let me know if you still have questions.

    Happy Mining,
  • Christos_KarapapasChristos_Karapapas Member Posts: 25 Contributor II
    I am sorry but neither the RM documentation or this youtube video explain how to setup and configure a user input component.
    I believe my question is very specific, if not please let me try to narrow it down even more.
    Btw, please correct me if I am wrong.

    When I insert to my process a Recall operator, there are no options to set in the name parameter.
    Now if I understand this correctly, on this parameter I should choose the name of the User Input Component that contain the Web App Variables I want to receive. After of course I set up the equivalent Macros on RM Studio, making sure that the Variables and Macros share the same name, and also making sure of all the other prerequisites I mention in this question.

    The problem now is that on the Recall operator I do NOT see any of View names of my Web App.
  • Christos_KarapapasChristos_Karapapas Member Posts: 25 Contributor II
    Edin_Klapic Thank you for the answer! It seems that I had it all wrong.

    Could you please elaborate to explain just a bit further the step3? What exactly does the following mean "attach the execution of the Process where the Macro/Variable is used to the User Input Component" in terms of configuration?

    What I understand is to go in the RM Server at the Web App, at the Input component and select as "Process to run" the process which has the macros and also the publish to App Object selected at the "Subscribe" option at the result component. Is this right?
  • Edin_KlapicEdin_Klapic Moderator, Employee, RMResearcher, Member Posts: 299 RM Data Scientist
    That is exactly what I meant with "attach".  - Great that you got it working :)
    Happy Mining,
  • Christos_KarapapasChristos_Karapapas Member Posts: 25 Contributor II
    Edin_Klapic I tried it but it work. I guess that either I am still missing a step of the process or perhaps there is something wrong with the configuration of either my RM Server or Studio. I keep trying though. Too bad there isn't a part in the documentation to describe this process step by step.
  • Christos_KarapapasChristos_Karapapas Member Posts: 25 Contributor II
    Edin_Klapic Yes! I finally understood how it works and fixed it! Thank you so much for your answer!!
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