Adding row for each three elements

Phoenix Forum Questions / Help
1

I want to add row for each three elements. I was using that code with ruby.

@books.each_slice(3) do |three_books| %>
div class= "row ">
<% three_books.each do |book| %>

How can achieve that with phoenix

2

Maybe one of those Enum functions

chunk_by/2 chunk_every/2 chunk_every/3 chunk_every/4
chunk_while/4

Probably Enum.chunk_every/2 fits your request

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3

Yes it looks like enum.chunks_every works but i couldnt handle that. It can divide list to 3 elements . I dont know how to handle for each array adding row. Sorry i am really noob. I dont know how ruby magic work behind it

4

In eex, that would be (not tested)

<%= books |> Enum.chunk_every(3) |> Enum.map(fn(three_books) -> %>
  # Do what You want with three books
  <%= three_books |> Enum.map(fn(book) -> %>
    # Do what You want with one book
  <% end) %>
<% end) %>
2 Likes
5

Thanks it works.But i didnt understand one point. In first line after chunk_every(3). How Enum.map behaves?
[1,2,3,5,6] and [[1,2,3],[4,5,6]] For Enum.map these lists are diffrent?

6

Yes, they are different…

[1,2,3,5,6] is a list with six elements

[[1,2,3],[4,5,6]] is a list with two lists of 3 elements

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