yogthos/Selmer

Iterating over double nested structures

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#121 opened on Apr 19, 2016

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 (3 comments) (0 reactions) (0 assignees)Clojure (670 stars) (86 forks)batch import
bughelp wanted

Description

Hi

I have the following structure, passed to Selmer as variable 'res':

[ { :a "A1"
    :b "B1"
     :c [{ :aa "AA1"
            :bb "BB1"
            :cc "CC1"}
          { :aa "AA2"
            :bb "BB2"
            :cc "CC2"}
          { :aa "AA3"
            :bb "BB3"
             :cc "CC3"}]}
    {:a "A2"
     :b "B2"
      :c [{ :aa "AA11"
             :bb "BB11"
             :cc "CC11"}
           { :aa "AA21"
             :bb "BB21"
             :cc "CC21"}
          { :aa "AA31"
            :bb "BB31"
             :cc "CC31"}]}]

I want to iterate over the items in the first vector and print them out, and when getting to the ':c' fields I want to then start an inner iteration to print out the contents.

At the moment it is possible to get to every element in the structure with dotted notation. However, when I introduce an iterator using {% for n in res %} I then can not repeat this for the inner vector. Is this a lacking feature or am I not seeing the bigger picture? Thanks

Contributor guide

Tech stack
None
Domain
backend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Clojure basicsSelmer template syntaxUnderstanding of for loop contextRecursion patterns
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Investigate the current implementation of the {% for %} tag in Selmer, likely in the template parsing files such as src/selmer/parser.clj. Look at how the for loop context is created and how nested loops are handled. Check if there is any recursion support or if the context is flattened. Consider adding support for nested loops by properly managing the loop variables and scopes. Review any existing tests for for loops to understand expected behavior.