We've been looking for a Wordpress plugin or system that lets you scope admin/contributor "roles" down to the field level. We have an immediate need for something like that, but totally coming up empty on options. There's a ton of options that let us scope down to a custom post type, but not necessarily the fields within that custom post type.
So far, the only solutions I've found let you customize admin user access to a custom post type, page or post, like add/edit/delete on the custom post type itself; but I haven't been able to find a solution that says "John Smith only gets to edit XYZ custom fields, and read-only access to the rest of the data for an entry".
We might have a custom post type called "Inventory", and it may have title, description, stock number, features, price, status. We'll have sales people able to edit "description" and "features, but they are not allowed to edit any of the other information. Those are created when the listing is added by a manager or website admin.
I'm at my wit's end with this, and not sure what the appropriate path to take might be. I may be stuck creating the CMS from scratch as we used to do in the old days. Which would be okay...if not for the timeframe deliverable given to me.
That said, if I were not able to find this all wrapped up in a nice plugin (paid or otherwise), is there a way for me to build out the custom post types and fields ahead of time, then apply some type of "functions.php" logic that adds the limitations I'm attempting to impose?