AC-web#9 final exam help-exercise-ac pull request#48

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noraliucode wants to merge 9 commits intoihower:masterfrom

noraliucode:master

Commits on Jul 22, 2016

Ajax delete comment
TzuYuan
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fix N + 1 queries
TzuYuan
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refactoring scope
TzuYuan
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add posts_count
TzuYuan
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add words_count unit test
TzuYuan
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Commits on Jul 23, 2016

Add messages api
TzuYuan
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Q7-1 add like and subscription model, and add foreign keys
TzuYuan
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Q7-2 add fake data: each message randomly be liked, subscript by two users
TzuYuan
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Q7-3 display message is liked, subscript by user in show
TzuYuan
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