Ruby-on-rails 从 has_many 中删除对象但不删除 Rails 中的原始记录？
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Remove object from has_many but don't delete the original record in Rails?
提问by valk
I have this:
我有这个：
Post.paragraphs << new_paragraph
And I need to remove paragraph by id = 3, so the following deletes the record completely:
我需要按 id = 3 删除段落，因此以下内容将完全删除记录：
Post.paragraphs.find(paragraph_id).destroy
# or
Post.paragraphs.find(paragraph_id).delete
I just need to remove a paragraph from has_many association. I tried to use deleteand destroy. Both methods completely delete records from the associated tables. How can I just remove them from the "container"?
我只需要从 has_many 关联中删除一个段落。我尝试使用delete和destroy。这两种方法都从关联的表中完全删除记录。我怎样才能从“容器”中删除它们？
回答by Baldrick
You should not use the deletemethod on the Paragraphobject, but instead use the delete method of paragraphsrelation, like this:
您不应该delete在Paragraph对象上使用该方法，而应使用paragraphs关系的删除方法，如下所示：
post.paragraphs.delete(Paragraph.find(paragraph_id))
