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I have a content type with a Node Reference field, so the user can select from a list of node titles. I need to filter out some nodes from the list (those that have a date field older than the current date).

I know that hook_form_alter() can be used to modify the display and validation of form fields, but probably not change the query that the field uses. So I think I need to write some kind of preprocess function for this field, that does a second filter on the contents?

Any pointers on how to do this would be great - thanks.

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Have a look at Restricting node reference values to owner

As described there, you can select a view as the source for the node reference selection. In that view, you can apply whatever conditions you want to that list.

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