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  • 07_Modified Variables Propagation in GET Request Nested Loop
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Modified Variables Propagation in GET Request Nested Loop

Flow variable Nested loop Modified variables propagation Get request
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This workflow demostrates the use of the option "Propagate modified loop variables" available in Loop End nodes. Given a list of search terms, the workflow iterates over each search item to avoid overloading (outer loop) and then it sends GET request to the Google Books API for each search term to get the relevant book authors and titles. The maximum results in Google Books API is 40, therefore, for each search term, the workflow repeats sending GET requests untill the starting index of an item (a book) is larger than the total number of available items for this search term (inner loop). The workflow demonstrates the difference for external, injected, and internal variables as well as the difference between the propagation option on (in the inner loop) and off (in the outer loop).

Used extensions & nodes

Created with KNIME Analytics Platform version 4.4.0
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    KNIME Base nodes Trusted extension

    KNIME AG, Zurich, Switzerland

    Version 4.4.0

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    knime
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    KNIME Javasnippet Trusted extension

    KNIME AG, Zurich, Switzerland

    Version 4.4.0

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    knime
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    KNIME JSON-Processing Trusted extension

    KNIME AG, Zurich, Switzerland

    Version 4.4.0

    KNIME profile image
    knime
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    KNIME Math Expression (JEP) Trusted extension

    KNIME AG, Zurich, Switzerland

    Version 4.4.0

    KNIME profile image
    knime
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    KNIME REST Client Extension Trusted extension

    KNIME AG, Zurich, Switzerland

    Version 4.4.0

    KNIME profile image
    knime
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