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Question

In my controller i fetch 9 row's for object organizations.

  @organizations = Organization.where(parent_id: 1).order(city_id: :asc, is_vip: :desc, title: :asc).limit(25).sample(9)

and then in view i must separate this 9 value's to 3 view loops, like first .each do if for row's 1-3, second for 4-6, third 6-9

and i try so:

- @organizations[0..2].each do |org|
...
- @organizations[3..5].each do |org|
...
- @organizations[6..8].each do |org|
...

but it seems that i do something wrong, but what exactly? and how to do it right?

Answer 1

Not sure why your data is duplicated. But you can use the following method for splitting the array into slices

you can use each_slice

@organization.each_slice(3) do |sliced_orgs|
end

Some documentation here

Answer 2

First I don't really get why you use .limit(25).sample(9) , you could limit your results to 9 already. But maybe you have some use of the random factor introduced by sample? Strange.

Other than that,

@organizations[0..2].each do |org|
    puts org
end
...

should work perfectly fine. If the data is repeated it is because you have multiple times the same entry in your model. sample(9) is taking random unique entries and @organizations[0..2] is a fixed range returning an array or nil. (Rubydoc : ary[range] → new_ary or nil )

In short, nothing wrong with the code but probably somewhere in your data/logic.