[Florian BURELLI (florian-burelli)]

Fixes #176

Problem

Activity._evaluate_expressions skips nested activity lists by checking "activities" in key (and the same on attribute names). The check is case-sensitive, so activities (ForEach, Switch cases) is skipped but ifTrueActivities, ifFalseActivities and defaultActivities are not. The raw JSON of those lists is still in type_properties (with its expression dicts already replaced by DataFactoryElements), so the expressions of both IfCondition branches, and of the Switch default branch, are evaluated eagerly in the scope of the container before the branch is chosen. An expression that is only valid on one branch fails the whole evaluation, e.g. @formatDateTime(pipeline().parameters.date, ...) on the false branch of @empty(pipeline().parameters.date).

Change

• _activity.py: the attribute and key checks go through one _is_nested_activities_name, which lowercases the name. Every nested activity list is now left to the control activity, which already evaluates the branch it takes in its own scope.

Tests

• tests/functional/branch_not_taken/: an IfCondition pipeline and a Switch pipeline whose untaken branch holds an expression that only works when that branch is taken (the repro of IfCondition evaluates the expressions of the branch not taken (case-sensitive "activities" check) #176). 4 cases, 3 of them fail on main.
• tests/unit/models/activities/base/test_activity.py: Activity.evaluate leaves expressions under activities, ifTrueActivities, ifFalseActivities and defaultActivities unevaluated. The two camel-cased IfCondition keys and defaultActivities fail on main.

Full suite: 229 passed. Ruff check and format clean.

🤖 Generated with Claude Code

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