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nah, "Foo" relates to the related object, not the relationship

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I've got the additional fields created, but the data isn't loading

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I've found this https://docs.silverstripe.org/en/4/developer_guides/forms/field_types/gridfield/#many-many-extrafields but it doesn't seem to work (the form is loaded, but the additional fields of the relationship object aren't populated)

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docs.silverstripe.org  
GridField

Developer and user documentation for the Silverstripe CMS and framework.

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are there any guides on managing many_many_through relationships in ModelAdmin? How do I expose/edit the additional data?

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I've got a check for $this->isChanged('MyRelationshipID') in validate() and it's triggering every time even when it's not changed

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is it expected that saving an item with modeladmin marks things as changed when they're still set the same?

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is there an established pattern for providing a file (eg a CSV) to a dev task?

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how do I programmatically manage many_many_through relationships?