You should not use the delete method on the Paragraphobject, but instead use the delete method of paragraphs relation, like this:
post.paragraphs.delete(Paragraph.find(paragraph_id))
You should not use the delete method on the Paragraphobject, but instead use the delete method of paragraphs relation, like this:
post.paragraphs.delete(Paragraph.find(paragraph_id))
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