Is it possible to change an existing text field (that already has data in it) from a long text field to a long text field with summary? If so, how would I go about it?
Is there a way to do it within the CMS, or would I have to do a similar thing to what's described here: https://forum.backdropcms.org/forum/how-programmatically-change-type-sav...?
Thanks.
There isn't a way to change the type of a field within the CMS. "Long text" and "Long text with summary" are different field types and have different columns in their tables, not to mention widgets and formatters.
So, AFAIK, currently the only way is to add another field to the content type, and then programmatically, loop through the nodes, get the values and formats of for the long text with summary field, and assign it to the long text field and save the node. Then delete the long text with summary field.