how do I loop through a list of folders and grab a picture file in ruby

Question

I need ruby code where i can loop throught a list of folders and then loop through each image individually in that folder

by grabing the pictures file and its name,

I know Dir.foreach is great to get the folder names but how do I get the pictures

ok : Dir.foreach("lfw/") do |item| Dir.glob("lfw/") do |filename| Dir.glob("lfw/#{filename}/") do |file| — BobTheCat, Mar 14 '18 at 14:59
Something like this? https://stackoverflow.com/questions/13629634/find-a-file-in-a-nested-directory-structure/ — lhdv, Mar 14 '18 at 15:26
upvoted for getting a gold medal before breaking 20 reputation — omikes, Mar 14 '18 at 21:34

score 1 · Answer 1 · answered Mar 14 '18 at 14:59

1

If I understand you correctly, you want a list of each file if it's an image?

If your images are all the same format, IE .jpg, you could use:

folder_results = Dir.foreach("your_folder_name") {|x| File.extname(x) }

for file in folder_results
    if (file === '.jpg')
    # do something
    end
end

answered Mar 14 '18 at 14:59

James Stewart

869
12
33

I put the folder name and I get this error: `open': No such file or directory @ dir_initialize - lfw/ (Errno::ENOENT) – BobTheCat Mar 14 '18 at 15:17
if I set it outside the main folder(the picture ive shown you I get this error: `block in
': undefined method `each' for nil:NilClass (NoMethodError)
– BobTheCat Mar 14 '18 at 15:25
its talking about the foreach loop – BobTheCat Mar 14 '18 at 15:26

score 1 · Answer 2 · answered Mar 14 '18 at 16:34

1

If you run following code from the base directory of your file structure, then it will list all files ending in ".jpg" or ".png".

Dir.glob("./**/*.{jpg,png}").each do |file|
  puts file
end

answered Mar 14 '18 at 16:34

Pascal

8,464
1
20
31

how do I loop through a list of folders and grab a picture file in ruby

2 Answers2