rails each loop with from to

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?

Why do you say you're doing something wrong? What is the problem you're seeing? — Ismail Badawi
– Ismail Badawi, Commented Apr 15, 2014 at 20:40
Are you sure there isn't duplicate data in the actual result set? — Chuck
– Chuck, Commented Apr 15, 2014 at 20:44

usha · Accepted Answer · 2014-04-15 20:45:05Z

5

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

answered Apr 15, 2014 at 20:45

usha

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1 Comment

byCoder Over a year ago

is it right syntax to view?

%ul           - @organizations[0..2].each do |org1|             %li               =link_to org1.title, organization_path(org1)               %p                 =raw "<strong>#{org1.city.name}</strong>, <br> #{org1.address}"       .introtext-separator       .introtext         %ul           - @organizations[3..5].each do |org2|             %li               =link_to org2.title, organization_path(org2)               %p                 =raw "<strong>#{org2.city.name}</strong>, <br> #{org2.address}"

LukeS · Accepted Answer · 2014-04-15 22:42:00Z

0

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.

answered Apr 15, 2014 at 22:42

LukeS

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2 Comments

Chuck Over a year ago

I think OP wants to get nine random entries, not nine deterministic entries.

byCoder Over a year ago

is it right syntax to view?

%ul           - @organizations[0..2].each do |org1|             %li               =link_to org1.title, organization_path(org1)               %p                 =raw "<strong>#{org1.city.name}</strong>, <br> #{org1.address}"       .introtext-separator       .introtext         %ul           - @organizations[3..5].each do |org2|             %li               =link_to org2.title, organization_path(org2)               %p                 =raw "<strong>#{org2.city.name}</strong>, <br> #{org2.address}"

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