I'm trying to write into a CSV some Hash elements. @boo_hoo
is my hash for each of its keys, if they have a single value, I don't want them in the CSV. There must be something wrong with my syntax. Could someone please explain a bit how to access the key+values of a hash in this case? Thanks!
CSV.open("final_data.csv", "wb") {|csv|
@boo_hoo.to_a.each.count {|k, v|
count.v > 1 csv << |k, v|
}
}
Welcome to Stack Overflow. When you next write a post, you can use the code formatting tools to make it a bit easier to read.
I can see a few errors here.
count.v
should be v.count
. unexpected tIDENTIFIER, expecting end-of-input
. You want to chain them together so that if your condition is met, then the args are added to the csv. |k, v|
are used to denote block arguments in ruby, but you're repeating them when you probably want an array. .to_a.each.count
is doing for you, except possibly causing more syntax errors. To write this in one line:
CSV.open("final_data.csv", "wb") {|csv| @boo_hoo.each {|k, v| csv << [k, v] if v.count > 1 } }
That might be a bit long, so I'd be tempted to break out the block into a multiline block:
CSV.open("final_data.csv", "wb") do |csv|
@boo_hoo.each {|k, v| csv << [k, v] if v.count > 1 }
end
EDIT: You've edited your post as I wrote this. In ruby, it's an idiom to use single braces {}
for a block consisting of a single line of code, but do ... end
for a block that stretches over multiple lines.
Also, in response to Mudasobwa's comment, you probably want to add a splat operator [k,*v]
. My code is valid ruby, but the output probably isn't what you want. Let's say @boo_hoo = {:a=>[1, 2, 3], :b=>[1], :c=>[1, 2]}
. The code above produces the output
a,"[1, 2, 3]"
c,"[1, 2]"
If you change the block to
@boo_hoo.each {|k, v| csv << [k, *v] if v.count > 1 }
you get the output
a,1,2,3
c,1,2
which is almost certainly what you actually want in a CSV.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.