Rails Object to hash

Question

I have the following object that has been created   post   Post create  name   gt   test    post number   gt  20   active   gt  true    Once this is saved  I want to be able to get the object back to a hash  e g  by doing somthing like    object to hash   How is this possible from within rails

User · Accepted Answer

If you are looking for only attributes  then you can get them by   post attributes  Note that this calls ActiveModel  AttributeSet to hash every time you invoke it  so if you need to access the hash multiple times you should cache it in a local variable  attribs    post attributes

User · Answer

There are some great suggestions here   I think it s worth noting that you can treat an ActiveRecord model as a hash like so    customer   Customer new  name   John Jacob     customer name        gt   John Jacob   customer  name       gt   John Jacob   customer  name       gt   John Jacob    Therefore  instead of generating a hash of the attributes  you can use the object itself as a hash

User · Answer

In most recent version of Rails  can t tell which one exactly though   you could use the as json method     post   Post first hash    post as json puts hash pretty inspect   Will output          name   gt   test      post number   gt  20     active   gt  true     To go a bit further  you could override that method in order to customize the way your attributes appear  by doing something like this    class Post  lt  ActiveRecord  Base   def as json  args               name   gt   My name is    self name            post number   gt   Post    self post number            end end   Then  with the same instance as above  will output           name   gt   My name is  test       post number   gt   Post  20      This of course means you have to explicitly specify which attributes must appear   Hope this helps   EDIT     Also you can check the Hashifiable gem

User · Answer

My solution   Hash  post attributes map   a   a  post a

User · Answer

not sure if that s what you need but try this in ruby console   h   Hash new h  name      test  h  post number     20 h  active     true h   obviously it will return you a hash in console  if you want to return a hash from within a method - instead of just  h  try using  return h inspect   something similar to   def wordcount str    h   Hash new     str split each do  key      if h key     nil       h key    1     else       h key    h key    1     end   end   return h inspect end

User · Answer

You could definitely use the attributes to return all attributes but you could add an instance method to Post  call it  to hash  and have it return the data you would like in a hash  Something like   def to hash    name  self name  active  true   end

User · Answer

Swanand s answer is great    if you are using FactoryGirl  you can use its build method to generate the attribute hash without the key id  e g   build  post  attributes

User · Answer

object as json   as json has very flexible way to configure complex object according to model relations   EXAMPLE  Model campaign belongs to shop and has one list  Model list has many list tasks and each of list tasks has many comments  We can get one json which combines all those data easily    campaign as json                except    created at   updated at           include                shop                    except    created at   updated at   customer id                   include   customer   except    created at   updated at                  list                    except    created at   updated at   observation id                   include                        list tasks                            except    created at   updated at                           include   comments   except    created at   updated at                                                                              methods   tags          Notice methods   tags can help you attach any additional object which doesn t have relations with others  You just need to define a method with name tags in model campaign  This method should return whatever you need  e g  Tags all   Official documentation for as json

User · Answer

Old question  but heavily referenced     I think most people use other methods  but there is infact a to hash method  it has to be setup right   Generally  pluck is a better answer after rails 4     answering this mainly because I had to search a bunch to find this thread or anything useful  amp  assuming others are hitting the same problem     Note  not recommending this for everyone  but edge cases     From the ruby on rails api     http   api rubyonrails org classes ActiveRecord Result html      This class encapsulates a result returned from calling  exec query on any database connection adapter  For example   result   ActiveRecord  Base connection exec query  SELECT id  title  body FROM posts   result     gt    lt ActiveRecord  Result 0xdeadbeef gt          Get an array of hashes representing the result  column   gt  value   result to hash     gt     id    gt  1   title    gt   title 1    body    gt   body 1            id    gt  2   title    gt   title 2    body    gt   body 2

User · Answer

You can get the attributes of a model object returned as a hash using either   post attributes   or   post as json   as json allows you to include associations and their attributes as well as specify which attributes to include exclude  see documentation   However  if you only need the attributes of the base object  benchmarking in my app with ruby 2 2 3 and rails 4 2 2 demonstrates that attributes requires less than half as much time as as json    gt  gt  p   Problem last  Problem Load  0 5ms   SELECT   problems    FROM  problems   ORDER BY  problems   id  DESC LIMIT 1   gt    lt Problem id  137  enabled  true  created at   2016-02-19 11 20 28   updated at   2016-02-26 07 47 34  gt    gt  gt   gt  gt  p attributes   gt    id   gt 137   enabled   gt true   created at   gt Fri  19 Feb 2016 11 20 28 UTC  00 00   updated at   gt Fri  26 Feb 2016 07 47 34 UTC  00 00   gt  gt   gt  gt  p as json   gt    id   gt 137   enabled   gt true   created at   gt Fri  19 Feb 2016 11 20 28 UTC  00 00   updated at   gt Fri  26 Feb 2016 07 47 34 UTC  00 00   gt  gt   gt  gt  n   1000000  gt  gt  Benchmark bmbm do  x    gt    x report  attributes     n times   p attributes       gt    x report  as json        n times   p as json      gt  gt  end Rehearsal ---------------------------------------------- attributes   6 910000   0 020000   6 930000    7 078699  as json     14 810000   0 160000  14 970000   15 253316  ------------------------------------ total  21 900000sec               user     system      total        real attributes   6 820000   0 010000   6 830000    7 004783  as json     14 990000   0 050000  15 040000   15 352894

[ruby-on-rails] Rails Object to hash

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