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"A valid class name starts with a letter or underscore, followed by any number of letters, numbers, or underscores. As a regular expression, it would be expressed thus: ^[a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*$. "

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so it's looking for the class Membership-Model-Hap%C5%AB

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ah yep, modeladmin's concept of sanitising class names for url strings is limited to replacing \\ with -

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leaning more to it being a bug in modeladmin

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ok, well the /dev/build worked fine and obviously parsed the class with no issues

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eg so that I don't have to remember to change hapu to hapū at every client-side display

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mm. wondering if it's maybe PHP which doesn't like the macrons in the class names

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hmm, ModelAdmin doesn't appear to like php class names with macrons in them