Yeng Tsan

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If someone is using Rails 5, notice that "the relational model MUST need the foreign key to create the instance", because the forum_thread has not created yet, the foreign key in forum_post is missing.

In Rails 5, need to add ', optional: true' to forum_post.rb

'belongs_to :forum_thread' >>> 'belongs_to :forum_thread, optional: true'

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