Hi All,
First of all, let me quickly clarify the meaning of ranking here.
All I'm doing is move an article up or down in the display on the index
file.
Quick example. Below is a sample of the Articles table:
ID title ranking
5 Rails is cool 1
6 Programming is fun 2
7 How to install Rails 3
8 Macbook Pro features 4
If a user click on article ID 7 to move it up, this is what the system
should do:
Change the ranking for article ID 7 to 2
Change the ranking for article ID 6 to 3
Basically, swap them around.
So as you can see, when a user click on an article, the system needs to
modify 2 records in the db.
Now, if I want to move the self.save to the controller, the best way I can
think of the implement this is as follows:
IMPORTANT: I have renamed the column rank to ranking below
In my model, I have 3 methods:
def self.find_by_rank(id, rank)
@this_article = find(id)
if (rank == "up")
@next_article = find_by(ranking: @this_article.ranking.to_i-1)
else
@next_article = find_by(ranking: @this_article.ranking.to_i+1)
end
end
def rankup
self.ranking = self.ranking - 1
end
def rankdown
self.ranking = self.ranking + 1
end
And in my controller, I have this:
def rank
@this_article = Article.find(params[:id])
@affected_article = Article.find_by_rank(params[:id], params[:rank])
if (params[:rank] == 'up')
@this_article.rankup
@affected_article.rankdown
else
@this_article.rankdown
@affected_article.rankup
end
@this_article.save
@affected_article.save
redirect_to articles_path()
end
This is the best way I can think of the move the self.save to the
controller while keeping the majority of the logic in the model.
Please let me know if there is a better way.
Thank you.
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