ruby on rails - Transform hash result of multiple group result set -

-

this output of product.group([:name, :category]).order([:name, :category]).count:

{   ["product a", "category 2"]=>42,   ["product a", "category 3"]=>83,   ["product a", "category 4"]=>47,   ["product b", "category 2"]=>1,   ["product b", "category 3"]=>4,   ["product b", "category 4"]=>10,   ["product c", "category 3"]=>2,   ["product c", "category 4"]=>4,   ["product d", "category 1"]=>6,   ["product d", "category 2"]=>13,   ["product d", "category 3"]=>57,   ["product d", "category 4"]=>27 }

each product can of categories 1-4. need have count of 0's final transformation.

desired transformation array columns: product name, count of category 1, count of category 2, count of category 3 , count of category 4:

[   ["product a",  0, 42, 83, 47],   ["product b",  0,  1,  4, 10],   ["product c",  0,  0,  2,  4],   ["product d",  6, 13, 57, 27] ] 

groups.group_by { |(p,_),_| p }.map |product, prod_groups|    [product, *(1..4).map |category|      (prod_groups.find {|(_, c), v| c == "category #{category}" }||[0]).last   end] end # => [["product a", 0, 42, 83, 47], ["product b", 0, 1, 4, 10], ["product c", 0, 0, 2, 4], ["product d", 6, 13, 57, 27]]

another option arbitrary category names:

category_names = ["category 1", "category 2", "category 3", "category 4"]  groups.group_by { |(p,_),_| p }.map |product, prod_groups|    sub_groups = hash[prod_groups.map { |(p, c), v| [c, v] }]   sub_groups.default = 0   [product, *category_names.map { |c| sub_groups[c] }] end # => [["product a", 0, 42, 83, 47], ["product b", 0, 1, 4, 10], ["product c", 0, 0, 2, 4], ["product d", 6, 13, 57, 27]]

Comments

Post a Comment

Popular posts from this blog

C# random value from dictionary and tuple -

-
i have following code, , need random item contains string "region_1" dictionary. public static dictionary<int, tuple<string, int, currencytype>> itemarray = new dictionary<int, tuple<string, int, currencytype>>() { { 0xb3e, new tuple<string, int, currencytype>("region_1", 1500, currencytype.fame) } }; public static int generateitemid(string shopid) { var generateditem = itemarray.elementat(new random().next(0, itemarray.count)).key; } how select this? it's not possible efficiently... first create static random @ class level... prevent non-random behaviour if run query on short period of time... (it's seeded discrete clock) static random rnd = new random(); then: var item = itemarray.values .where(t => t.item1 == shopid) .orderby(_ => rnd.next()) .firstordefault()
Read more

cgi - How do I interpret URLs without extension as files rather than missing directories in nginx? -

-
so i'm trying install zoneminder , have run under nginx, has few compiled files need run using fast-cgi. these files lack extension. if file has extension, there no issue , nginx interprets file , return 404 if can't find it. if has no extension, assume it's directory , return 404 when can't find sort of index page. here have now: # security camera domain. server { listen 888; server_name mydomain.com; root /srv/http/zm; # enable php support. include php.conf; location / { index index.html index.htm index.php; } # enable cgi support. location ~ ^/cgi-bin/(.+)$ { alias /srv/cgi-bin/zm/; fastcgi_pass unix:/run/fcgiwrap.sock; fastcgi_param script_filename $document_root/$1; include fastcgi.conf; } } the idea is, under cgi-bin directory goes through fastcgi pipe. any idea on howi can fix this? upon closer inspection, realized zoneminder has 2 cgi sc...
Read more

.htaccess - htaccess convert request to clean url and add slash at the end of the url -

-
ok , searched more 4 days , more 20 posts here in stach or in websites without kind of success first here htaccess file rewriteengine on rewriterule ^([a-za-z0-9_]+)/?$ index.php?page=$1 [nc] rewriterule ^([a-za-z0-9_]+)\/([a-za-z0-9_]+)\/?$ index.php?page=$1&action=$2 [nc] i tried many codes 1 worked me can call request , works me www.example.com/pagename => www.example.com/index.php?page=pagename here questions , please provide me information "in detail" understand code well 1- how convert request automatically www.example.com/index.php?page=pagename www.example.com/pagename 2- if tried add slash @ end shows me page without images or styling mean www.example.com/pagename => works www.example.com/pagename/ => doesn't work that's :) for first part need 301 rule this: rewritecond %{the_request} /index\.php\?page=([^\s&]+) [nc] rewriterule ^ /%1? [r=301,l] for second part use absolute path in css, js, images files r...
Read more