Tips feature

[Br3nda]

A bit like tips on foursquare, a crop can have growing tips. E.g. "cut scapes off garlic to make the bulbs grow bigger".

It should probably be restricted only to users who have grown that crop.

As a user, I'd like a way to enter short (280char) tips on how to grow a crop that I myself have grown, so I can share that knowledge with other users.

Acceptance criteria:
Can add a tip to crop from crop page
Is restricted to 280 char
Can add tip from planting page
Cannot add tip if not ever had a planting of that crop
Can edit tip.
Can delete tip
Can see tips on crop page.
Can see who wrote the tip.
Can see authors expertise, e.g. Expert in pumpkins, 14 plantings over 5 years.

Optional if time:
Can up/down vote tip
Tip with most votes first.
Users marking a tip as spam.
Admin can see list of spam marked tips, and delete tip or ban member who created it
Banned members tips get deleted.
Paginate tips list on crops page.

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[Br3nda]

For discussion, maybe a tip has a date aspect, Eg. "10 days after planting" or "in autumn". If we make it data, we can later hook the tips into the timelines on users' plantings, so they get advice at the right time for their own plantings.

[Br3nda]

For reference, this is what tips look like on foursquare

[Br3nda]

this could be useful for the upvoting:
https://github.com/ryanto/acts_as_votable

[CloCkWeRX]

I was going to have a quick go at this, but I got distracted with acts-as-commentable maintenance, which seems like a good way to generally add "tip"/comments to ... everything.