ruby - Sorting elements in DataMapper -


i have database, , need sort whole table length, i've got stack on it.

require 'dm-core' require 'dm-migrations' require 'sinatra/reloader'  datamapper.setup(:default, "sqlite3://#{dir.pwd}/development.db")  class item   include datamapper::resource    property :id, serial   property :length, integer end  ...  datamapper.finalize  post '/items/sort/?' 5.times     val = rand(100)     item.create(length: val)   end    item.update(item.sort_by { |_key, value| value })   redirect to('/items') end

how can perform correctly, database update sorted length elements? thank you.

item.sort_by(&:length)

above code achieve desired result. 

2.3.1 :001 > require './app.rb'  => true  2.3.1 :002 > item.all  => [#<item @id=1 @length=21>, #<item @id=2 @length=85>, #<item @id=3 @length=41>, #<item @id=4 @length=71>, #<item @id=5 @length=71>]  2.3.1 :003 > item.sort_by(&:length)  => [#<item @id=1 @length=21>, #<item @id=3 @length=41>, #<item @id=4 @length=71>, #<item @id=5 @length=71>, #<item @id=2 @length=85>]  2.3.1 :004 >

Comments

Post a Comment

Popular posts from this blog

commonjs - How to write a typescript definition file for a node module that exports a function? -

consider, toml node module can use: // toml.d.ts declare module toml { export function parse(value:string):any; } declare module "toml" { export = toml; } then: /// <reference path="../../../../../defs/toml/toml.d.ts"/> import toml = require('toml'); toml.parse(...); however, node module export single function, such 'glob' ( https://github.com/isaacs/node-glob ). the node usage of module be: var glob = require("glob") glob("*.js", {}, callback(err, files) { ... }); you'd naively expect this: // glob.d.ts declare function globs(paths:string, options:any, callback:{(err:any, files:string[]):void; ...but because typescripts 'import' semantics bit strange, seems can use 'import .. = require()' statement alias modules . trying call: /// <reference path="../../../../../defs/glob/glob.d.ts"/> import blog = require('glob'); results in: error ts2072: mod
Read more

openid - Okta: Failed to get authorization code through API call -

i'm integrating okta own idp server using okta's api. i'm implementing authorization code flow following steps below: in own server, use /api/v1/authn endpoint sessiontoken. use sessiontoken obtain authorization calling endpoint: /oauth2/v1/authorize?client_id=" + clientid + "&sessiontoken=" + sessiontoken + "&response_type=code&response_mode=query&scope=openid&redirect_uri=" + redirecturl + "&state=evanyang&nonce=" it's supposed return response status code 302 , location header containing redirect url code value. however, keep getting response status code 200 , without location header, html body saying "you using unsupported browser." , "javascript disabled on browser." according api documentation: http://developer.okta.com/docs/api/resources/oidc.html#authentication-request , sessiontoken parameter sufficient this: an okta one-time sessiontoken. allows api-based
Read more

thorough guide for profiling racket code -

did googling ("racket profiling", "racket measure performance"), didn't find , there no examples in docs. did google "profile" search on htdp - no luck. (profile (f ...)) output isn't obvious other small snippets. ideally want python's python -m cprofile usage examples. when search "python profiling", both duckduckgo , google give top result: 26.4. python profilers . (although scanned quickly, seems more of reference "thorough usage guide" examples. if had else in mind, perhaps please link that?) the equivalent racket documentation be: profile: statistical profiler . a usage example: #lang racket (require profile) (profile-thunk (thunk (function-to-profile arg0 arg1) )) here (thunk e) convenience (lambda () e) . bigger example: #lang racket (module mod racket (provide f) (define (f) (for/list ([i 10000]) i))) (require (prefix-in mod: 'mod)) (define (f) (for ([i 10000
Read more