feat(template): make join template function more flexible#5233
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📝 WalkthroughWalkthroughThe ChangesJoin Function Reflection Support
Sequence Diagram(s)sequenceDiagram
participant TemplateCaller
participant JoinFunc as join(sep, v)
participant Reflect as reflect
participant StringsJoin as strings.Join
participant FmtSprint as fmt.Sprint
TemplateCaller->>JoinFunc: invoke with sep + v
JoinFunc->>Reflect: inspect v (isValid, kind)
alt v is invalid
JoinFunc-->>TemplateCaller: return ("", nil)
else v is []string
JoinFunc->>StringsJoin: strings.Join(v, sep)
StringsJoin-->>JoinFunc: concatenated string
JoinFunc-->>TemplateCaller: return (result, nil)
else v is slice/array
JoinFunc->>Reflect: iterate elements
Reflect->>FmtSprint: convert each element
FmtSprint-->>JoinFunc: element strings
JoinFunc->>JoinFunc: join elements with sep
JoinFunc-->>TemplateCaller: return (result, nil)
else
JoinFunc-->>TemplateCaller: return ("", error)
end
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Actionable comments posted: 3
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Inline comments:
In `@docs/notifications.md`:
- Line 92: Update the docs for the join filter to explicitly state coercion
behavior: clarify that join (described as "join") accepts elements of type any
and will convert non-string elements to their string representation (e.g. via
standard stringification like fmt.Sprint) before concatenation, and that it does
not return an error on conversion (unless the implementation documents
otherwise); reference the existing strings.Join mention for string-only behavior
and note the argument order inversion for templates.
In `@template/template_test.go`:
- Around line 355-359: Add a test case in template_test.go that exercises join
with non-string elements to ensure elements are stringified: add a case similar
to the existing "Template using join with list" entry but with in set to `{{
list 1 true "x" | join "," }}` and exp set to `1,true,x`; place it alongside the
other cases in the same test table so the join behavior for mixed-type lists is
enforced when the test runner iterates over the cases.
In `@template/template.go`:
- Around line 201-204: The join implementation currently enforces elements be
strings by asserting elem.(string) and returning an error; change it to accept
any element type by removing the string type assertion and instead convert each
elem to a string (e.g. via fmt.Sprint or fmt.Sprintf("%v", elem)) before
concatenation so join accepts slices/arrays of any element type; update the code
in the join function where the variable elem is handled to perform this
conversion and remove the error path that checks for non-string types.
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docs/notifications.mdtemplate/template.gotemplate/template_test.go
Allow `join` template function to accept a slice of any type, not just strings. The function will convert non-string elements to their string representation before joining them. This provides more flexibility in templating, e.g. creating slices with `list` and then joining them. Signed-off-by: Christoph Maser <christoph.maser+github@gmail.com>
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