Ruby on Rails

Jason Hsu, Android developer wrote in post #1103930:
> I'm learning how to work with Postgres databases.
>
> I've figured out how to get the script at
>
http://marcclifton.wordpress.com/2012/11/12/an-example-of-using-postgresql-with-ruby/
> to run properly. I learned from this script how to enter data into a
> database table (addUser function) and how to print data from a database
> table on the screen (queryUserTable function).
>
> What I'm trying to do now is store data from a database table in a
> variable
> (like an array of strings). For this particular example, how would you
> go
> about doing this?

p.queryUserTable {|row| printf("%d %s\n", row['id'], row['name'])}

This line has done exactly what you're asking. The "row" is a hash
variable that contains the data from the database. If you want to put
that data a variable of your own the just define a variable and put the
data in it:

# Add the name from each row in an array
my_arrary = []
p.queryUserTable do |row|
my_array << row['name']
end
puts my_array

In fact if you look at this line:

@conn.exec( "SELECT * FROM users" ) do |result|

All the data from the table is already given to you inside the "result"
hash, which is just a variable containing the data you selected from the
database. There's really no need to make yet another variable to put the
data into. Just use the one the PostgreSQL connection gives you back.

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I have also added pages on Ruby on Rails to my web site at http://www.jasonhsu.com/ror .  I'm not that much more experienced than you are, so I have to take good notes on the proper procedures.

My Ruby on Rails pages cover the material that most other Ruby on Rails web sites gloss over, such as how to install RVM in Debian Stable, how to install the JavaScript Runtime, and how to graduate beyond the training wheels phase.  (I consider SQLite and free Heroku accounts to be Ruby on Rails on training wheels.  They're essential for newbie learning exercises, but they don't cut it for serious apps.)

I previously made an unsuccessful attempt to learn Ruby on Rails.  Some essential prerequisites:
1.  Experience with object-oriented programming (which I gained from Python)
2.  Experience with an easier web framework (which I gained from Drupal)
3.  Familiarize yourself with Ruby first.  A good project that makes use of Ruby will motivate you to really learn it. 
4.  Have a good project in mind that requires Ruby on Rails.  Learning for the sake of learning doesn't work for me, as I don't get fully engaged.

Some tips:
1.  Don't try to learn too many things all at once.  You'll get confused.  Just focus on one thing at a time (like deployment, Postgres, etc.).
2.  Don't spend too much time initially on the big tutorial at railstutorial.org.  I think I spent too much time on this initially.  I plan to revisit it multiple times.


On Friday, March 29, 2013 5:45:46 AM UTC-5, Anwaar Ansari wrote:

Hello..

Can anyone help me in make a KIckstarter-like site with Ruby on Rails?

IF anyone helps me.. I would be really happy..

Anwaar

I'm learning how to work with Postgres databases.

I've figured out how to get the script at http://marcclifton.wordpress.com/2012/11/12/an-example-of-using-postgresql-with-ruby/ to run properly.  I learned from this script how to enter data into a database table (addUser function) and how to print data from a database table on the screen (queryUserTable function).

What I'm trying to do now is store data from a database table in a variable (like an array of strings).  For this particular example, how would you go about doing this?

Hey folks:

In a rails app I'm building, the home page will have two forms:  one to sign-up for an account, another one to sign-in to an existing account.

Now, if I were to use object form helpers to build these forms, the controller for the homepage would need to create instances of the relevant models each time someone visits the homepage.

This concerns me a bit, because a visitor to the home page may or may not end up using either the sign-up or sign-in forms.  For instance, they may instead click a link that gives a "tour" of the app.  If they do so, will the instance variables created by the controller in anticipation of the POTENTIAL use of the forms be garbage-collected?

I'm just thinking about efficiency here -- don't want to have a bunch of extra instance variables taking up space in the runtime memory just for the sake of the (slight) convenience of using model object forms helpers rather than plain-vanilla form handlers.

Thanks!

yea) I just do not notice. Thanks for your help!

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i add curl --silent http://localhost:3000/products/3/who_bought -H
"Accept: application/xml"

show error: <h1>
NoMethodError
in ProductsController#who_bought
</h1>
<pre>undefined method `order&#x27; for #&lt;Product:0xb6196084&gt;</pre>


<p><code>Rails.root: /home/dima/RubyOnRails/Projects/depot</code></p>

its my product.rb:

class Product < ActiveRecord::Base
has_many :line_items, dependent: :destroy
has_many :orders, through: :line_items

before_destroy :ensure_not_referenced_by_any_line_item

attr_accessible :title, :description, :image_url, :price

validates :title, :description, :image_url, :price, :presence => true
validates :price, numericality: {greater_than_or_equal_to: 0.01}
validates :title, uniqueness: true
# validates :image_url, allow_blank: true, format: {
# with: %r{ \.(gif|jpg|png)$}i,
# message: 'gif, jpg png. '
#}
#validates :image_url, :uniqueness => false

def ensure_not_referenced_by_any_line_item
if line_items.empty?
return true
else
errors.add(:base, " have products line")
return false
end
end

end

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For example i can see in command line: curl --silent
http://localhost:3000/products/3/who_bought.atom.builder.

And how me call in command line format.xml?

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Hey, Guys!

I have next action in controller products:

def who_bought
@product = Product.find(params[:id] )
respond_to do |format|
format.html
format.xml { render :xml => @product.to_xml( :include => :order )
}
format.json {render :json => @product.to_json(:include => :order )
}
end
end

routes.rb
.......................
resources :products do
get :who_bought member: :on
end
..........................

I want check, how work in xml format. How me call in command line my
format xml? (format.xml { render :xml => @product.to_xml( :include =>
:order ) })

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From my point of view (as a professional Rails dev), this makes much better and more complete sense. Devs are *always* confused about this, and have lots of trouble around it. 

Here's a post by Jose Valim on the reasoning behind the change:

There is a ready to use repository on http://www.opensourcerails.com/selfstarter/ which is really similar to kickstarter.

On 29 March 2013 10:45, Anwaar Ansari <anwaaransari09@gmail.com> wrote:
> Hello..
>
> Can anyone help me in make a KIckstarter-like site with Ruby on Rails?
> IF anyone helps me.. I would be really happy..

I presume that you are a beginner with rails. First work right
through a good tutorial such as railstutorial.org, which is free to
use online. That will show you the basics of rails. Also look a the
Rails Guides.

Colin

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Hello Everyone,

If you are using Rails, put your Capybara specs in spec/features.

If you are not using Rails, tag all the example groups in which you want to use Capybara with :type => :feature.

On 29/03/2013, at 9:45 PM, Anwaar Ansari <anwaaransari09@gmail.com> wrote:

> Hello..
>
> Can anyone help me in make a KIckstarter-like site with Ruby on Rails?
> IF anyone helps me.. I would be really happy..
>
> Anwaar


You will be helped to the degree you put effort in.

Start in small steps. The first step is to learn how to make a "hello world" type app. Go do that.

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On 30 March 2013 20:59, Jay notReq <lists@ruby-forum.com> wrote:
> On the left hand side of my page there is a list of documents that the
> user has already created. And a form to create/edit documents.
>
> | list of documents| Edit/Create documents|
> | | |
> | | |
> I am trying to do the following
>
> 1) Show form for creating a new document when the page first loads.And
> on button click reload the page with the updated list and the document
> newly created.
>
> 2) When user clicks on one of the existing documents I want to update
> the form to display the details of the document.
>
> I was thinking that partials would be the way to do this.
>
> I have part of (1) done. Now I 'm trying to load the details of the
> existing documents.
>
> Any suggestions on how to fix the following error and secondly reload
> page when a new document is created.

I would ask one question at a time, otherwise the thread will get side
tracked. First fix the error.

>
> undefined local variable or method `document' for
> #<#<Class:0x007fb10b926c60>:0x007fb109fad478>
> Extracted source (around line #1):
>
> 1: <%= form_for document do |f| %>
> 2: <div class="field">
> 3: <%= f.label :name %><br />
> 4: <%= f.text_field :name %>
> Index.html.erb
> ...
> <%= link_to 'New Document', new_document_path %>
> </div>
> <div id="docEdit">
> <%= render :partial => "form", :locals => { :document =>
> Document.new } %>

Are you sure you have not got another call to the form partial
somewhere else, and have forgotten the locals specification there?

If not then have a look at the Rails Guide on debugging which will
show you techniques that you can use to debug the code.

Colin

> ...
> _form.html.erb
>
> <%= form_for document do |f| %>

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On the left hand side of my page there is a list of documents that the
user has already created. And a form to create/edit documents.

| list of documents| Edit/Create documents|
| | |
| | |
I am trying to do the following

1) Show form for creating a new document when the page first loads.And
on button click reload the page with the updated list and the document
newly created.

2) When user clicks on one of the existing documents I want to update
the form to display the details of the document.

I was thinking that partials would be the way to do this.

I have part of (1) done. Now I 'm trying to load the details of the
existing documents.

Any suggestions on how to fix the following error and secondly reload
page when a new document is created.

undefined local variable or method `document' for
#<#<Class:0x007fb10b926c60>:0x007fb109fad478>
Extracted source (around line #1):

1: <%= form_for document do |f| %>
2: <div class="field">
3: <%= f.label :name %><br />
4: <%= f.text_field :name %>
Index.html.erb

<div id="docList">
<%= search_field(:user, :document) %>

<% @documents.each do |document| %>
<li><%= link_to document.name, edit_document_path(document.id)
%></li>
<% end %>
<br />

<%= link_to 'New Document', new_document_path %>
</div>
<div id="docEdit">
<%= render :partial => "form", :locals => { :document =>
Document.new } %>
</div>
_form.html.erb

<%= form_for document do |f| %>
<div class="field">
<%= f.label :name %><br />
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :notes %><br />
<%= f.text_area :notes %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>

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I found the way to do that as follows:

The below query fails:

hi
i want to run my ruby application on aptana studio 3.0 : when i run the
railsserver i have this message :
C:/Ruby200/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:106:in
`require': cannot load such file -- initializer (LoadError)
from
C:/Ruby200/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:106:in
`require'
from C:/Dev/Aptana/bibliotheque/config/boot.rb:55:in
`load_initializer'
from C:/Dev/Aptana/bibliotheque/config/boot.rb:38:in `run'
from C:/Dev/Aptana/bibliotheque/config/boot.rb:11:in `boot!'
from C:/Dev/Aptana/bibliotheque/config/boot.rb:110:in `<top
(required)>'
from
C:/Ruby200/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in
`require'
from
C:/Ruby200/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in
`require'
from C:/Dev/Aptana/bibliotheque/script/server:2:in `<main>'

Have you an idea?
-----------
My config :
-----------
Windows 7
Aptana Studio 3
Ruby 2.0.0p0 (2013-02-24) [i386-mingw32]
Gem : gem list
actionmailer (3.2.13)
actionpack (3.2.13)
activemodel (3.2.13)
activerecord (3.2.13)
activeresource (3.2.13)
activesupport (3.2.13)
arel (3.0.2)
bigdecimal (1.2.0)
builder (3.0.4)
bundler (1.3.4)
cgi_multipart_eof_fix (2.5.0)
coffee-rails (3.2.2)
coffee-script (2.2.0)
coffee-script-source (1.6.2)
erubis (2.7.0)
execjs (1.4.0)
fastthread (1.0.1 i386-mswin32)
gem_plugin (0.2.3)
hike (1.2.1)
i18n (0.6.1)
io-console (0.4.2)
journey (1.0.4)
jquery-rails (2.2.1)
json (1.7.7)
linecache (0.43 mswin32)
mail (2.5.3)
mime-types (1.21)
minitest (4.3.2)
mongrel (1.1.5 x86-mswin32-60)
multi_json (1.7.2)
mysql (2.7.3 mswin32)
polyglot (0.3.3)
psych (2.0.0)
rack (1.4.5)
rack-cache (1.2)
rack-ssl (1.3.3)
rack-test (0.6.2)
rails (3.2.13)
railties (3.2.13)
rake (10.0.4, 0.9.6)
rdoc (4.0.0, 3.12.2)
ruby-debug-base (0.10.3 mswin32)
ruby-debug-ide (0.4.5)
rubygems-update (2.0.3)
sass (3.2.7)
sass-rails (3.2.6)
sprockets (2.2.2)
sqlite3 (1.3.7 x86-mingw32)
sqlite3-ruby (1.2.1 mswin32)
test-unit (2.0.0.0)
thor (0.18.0)
tilt (1.3.6)
treetop (1.4.12)
tzinfo (0.3.37)
uglifier (1.3.0)

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  We probably need to have a sinatra web server where different clients through different sessions each have different databases but with the same tables.
If I have an active record class such as MyFoo, it would be ideal for it to be for table foo on either db1, db2, etc. If I have MyFoo1 and MyFoo2, I can set
MyFoo as a constant to each of those ie MyFoo = MyFoo2 (MyFoo on database 2), but every time I am in a new session I have to delete the old constant
and set it to the new one. I am not sure that is the only way. I guess I could somehow write a class MyFoo that uses method_missing and then figures out the correct active record instance, but not sure if there was an easier way ?

my test program:

=====================

require  "rubygems"
require  "active_record"
require 'sqljdbc4.jar'


ActiveRecord::Base.configurations["mtmdb"]  = {:adapter         =>  "jdbc",
    :url=> 'jdbc:sqlserver://10.93.31.331;databaseName=mt',
        :username      =>  "",
        :password      =>  "",
    :driver => "com.microsoft.sqlserver.jdbc.SQLServerDriver",
        :autocommit  =>  true}

ActiveRecord::Base.configurations["test"]  = {
:adapter         =>  "jdbc",
    :url=> 'jdbc:sqlserver://10.94.11.11;databaseName=LJ',
        :username      =>  "",
        :password      =>  "",
    :driver => "com.microsoft.sqlserver.jdbc.SQLServerDriver",
        :autocommit  =>  true
}


class TestdbBase1 < ActiveRecord::Base
  self.abstract_class = true
  def self.connect2db
    establish_connection 'test'
  end
end   

class TestdbBase2 < ActiveRecord::Base
  self.abstract_class = true
  def self.connect2db
    establish_connection 'mtmdb'
  end
end   



class MyTestTable1 < TestdbBase1
  self.table_name = "my_test_table"
end   

class MyTestTable2 < TestdbBase2
  self.table_name = "my_test_table"
end   

TestdbBase1.connect2db
MyTestTable = MyTestTable1

rec = MyTestTable.first
p rec

Object.send(:remove_const, :MyTestTable)

TestdbBase2.connect2db
MyTestTable = MyTestTable2

rec = MyTestTable.first
p rec

This is because we have a whitelabel feature in our app, and therefore most columns and tables are labelled to. The label "app" simply means that it loads all the data from our main app.

W dniu piątek, 29 marca 2013 11:48:56 UTC+1 użytkownik Colin Law napisał:

On 29 March 2013 09:57,  <maciej...@timeself.pl> wrote:
> Hey, thanks for the answer.
>
> As for the Book.rb - yes, it's a typing error.
>
> When I run Book.first.length in the rails console, I get:
>
> 1.9.3-p327 :001 > Book.first.length
>   Book Load (0.2ms)  SELECT "books".* FROM "books" WHERE "books"."label" =
> 'app LIMIT 1

Why does that include a WHERE clause?  and why is it looking for label = 'app

Colin

On 29 March 2013 09:57, <maciej.mietek@timeself.pl> wrote:
> Hey, thanks for the answer.
>
> As for the Book.rb - yes, it's a typing error.
>
> When I run Book.first.length in the rails console, I get:
>
> 1.9.3-p327 :001 > Book.first.length
> Book Load (0.2ms) SELECT "books".* FROM "books" WHERE "books"."label" =
> 'app LIMIT 1

Why does that include a WHERE clause? and why is it looking for label = 'app

Colin

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Hello..

Hey, thanks for the answer.

As for the Book.rb - yes, it's a typing error.

When I run Book.first.length in the rails console, I get:

1.9.3-p327 :001 > Book.first.length
  Book Load (0.2ms)  SELECT "books".* FROM "books" WHERE "books"."label" = 'app LIMIT 1
 => nil

And yes, I did run the migration.

I think the problem can lie in Mongo collections. I've added the "length" collection by updating an already working Mongo Document. Maybe that's the problem?  I'll try to set up another mongo document with the length collection only.

class Guide::Document
  include MongoMapper::Document
 
  key :city, Integer
  key :trips, Array
  key :themes, Array
  key :places, Array
  key :pace, String
  key :date_from, Time
  key :date_to, Time
  key :host, String
  key :length, Integer
  timestamps!
end

W dniu czwartek, 28 marca 2013 16:52:13 UTC+1 użytkownik Colin Law napisał:

On 28 March 2013 13:07,  <maciej...@timeself.pl> wrote:
> Hey
>
> I have a problem with nomethoderror and have no idea how to solve it.
>
> In logs:
>
> NoMethodError (undefined method `length=' for #<Book:0x000000081583f0>):
> 2013-03-28T12:38:35+00:00 app[web.2]:   app/models/engine/book.rb:13:in
> `block in find_or_create_by_guide'
> 2013-03-28T12:38:35+00:00 app[web.2]:   app/models/engine/book.rb:9:in
> `find_or_create_by_guide'
> 2013-03-28T12:38:35+00:00 app[web.2]:
> app/controllers/guide_controller.rb:37:in
> `find_or_create_book_based_on_guide'
>
> cache: [GET /en/books/planner/preview] miss
> 2013-03-28T12:38:35+00:00 app[web.2]: Processing by BooksController#preview
> as */*
> 2013-03-28T12:38:35+00:00 app[web.2]:   Parameters: {"locale"=>"en",
> "id"=>"planner"}
> 2013-03-28T12:38:35+00:00 app[web.2]: Unknown label 'www'. Switching label
> to bookless
> 2013-03-28T12:38:35+00:00 app[web.2]: Finded book #515439c0e622d90002000019
> 2013-03-28T12:38:35+00:00 app[web.2]: Completed 500 Internal Server Error in
> 82ms
>
> Book.rb:
> module ClassMethods
>       def find_or_create_by_guide(guide)
>         book = ::Book.find_or_create_by_document(guide.id.to_s) do |t|
>           t.city_id = guide.city
>           t.host    = guide.host
>           t.pace    = guide.pace || :normal
>           t.length  = guide.length
>         end
> Later in Book.rb, I have:
>
> groups = sorted_points.in_groups_of(length, false)
>
>
> In Book.rb I have attr_accessible :length. I've also updated the table with
> length column:
> class AddLengthColumnToBooks < ActiveRecord::Migration
>   def change
>     add_column :books, :length, :integer
>   end
> end
>
> I have no idea what's going on. Can someone please help me with this?

The error refers to book.rb but you refer to Book.rb.  Is that just a
typing error?

What happens if, in the Rails Console you do
Book.first.length

I presume you have run the migration.  Have you checked using a
database tool that the column exists?

I wonder whether length is a reserved word.  If all else fails try a
different name.

Colin

Hi,

On Thursday, 28 March 2013 19:03:48 UTC, Bigos wrote:

I have problems with multiple file upload. I tried Paperclip with jQuery file uplad plugin and get the error mentioned in the title. Files get uploaded without problems, but I keep getting this embarrassing error...

  def create
    @photo = Photo.new(params[:photo])

    respond_to do |format|
      if @photo.save
        format.html { render :json => [@photo.to_jq_upload].to_json, 
          :content_type => 'text/html',
          :layout => false
        }
        format.json { render json: {files: [@photo.to_jq_upload] }}
      else
        format.html { render action: "new" }
        format.json { render json: @photo.errors, status: :unprocessable_entity }
      end
    end
  end

On Friday, March 29, 2013 7:32:36 AM UTC, Jussi Hirvi wrote:

On Thursday, March 28, 2013 4:06:09 PM UTC+2, Dihital wrote:

Redirect ends current request and starts a new one, so you are right that that's the case (another action isn't called nor its template rendered).

That left me pondering, why does it matter that a new request is started. Anyway, it seems that rspec tests can verify that a redirect to a given path occurs, but there is no way to evaluate the contents of the resulting page: 

http://stackoverflow.com/questions/2865378/rspec-rails-how-to-follow-a-redirect

Maybe someone can verify that this is the case, or tell me otherwise? 

 

On 28 Mar 2013, at 21:24, Colin Law <clanlaw@googlemail.com> wrote:

> On 28 March 2013 19:35, Serguei Cambour <s.cambour@gmail.com> wrote:
>> Recently I discovered one thing I didn't even think about, or I believed it
>> to work absolutely differently.
>> So, to explain it, given the following models:
>>
>> class Project < AR
>> has_many :participants
>> end
>>
>> class Participant < AR
>> belongs_to :project
>> end
>>
>> Here is what is going in the console:
>>
>> irb(main):003:0> p=Project.create(:name=>'java')
>> ←[1m←[36m (0.0ms)←[0m ←[1mSAVEPOINT active_record_1←[0m
>> ←[1m←[35mSQL (43.0ms)←[0m INSERT INTO "projects" ("created_at", "name",
>> "updated_at") VALUES (?, ?, ?) [["
>> created_at", Thu, 28 Mar 2013 19:27:06 UTC +00:00], ["name", "java"],
>> ["updated_at", Thu, 28 Mar 2013 19:27:06
>> UTC +00:00]]
>> ←[1m←[36m (0.0ms)←[0m ←[1mRELEASE SAVEPOINT active_record_1←[0m
>> => #<Project id: 1, name: "java", created_at: "2013-03-28 19:27:06",
>> updated_at: "2013-03-28 19:27:06">
>> irb(main):004:0> p.participants
>> ←[1m←[35mParticipant Load (0.0ms)←[0m SELECT "participants".* FROM
>> "participants" WHERE "participants"."pro
>> ject_id" = 1
>> => []
>> irb(main):005:0> part = p.participants.new(username:'toto')
>> => #<Participant id: nil, username: "toto", project_id: 1, created_at: nil,
>> updated_at: nil>
>> irb(main):006:0> p.participants
>> => [#<Participant id: nil, username: "toto", project_id: 1, created_at: nil,
>> updated_at: nil>]
>>
>> I always believed that the collection of participants should keep the same
>> size (zero in the above case) until I call save on the Project object. As
>> you see the collection has been changed by 1, despite the record has not
>> been yet save to the database; Is it a normal behaviour ?
>
> You have added one to the collection so it appears in the collection
> in memory. Note that there is no need to save the project object in
> order to add to its collection as nothing in the project object
> changes. It is the participant that must be saved at some point,
> otherwise it will be lost.

Thank you, Colin, for the answer, I believed that every time you call a collection method, for example:

project.participants

a DB query will be made to get it, but it is not the case.

Regards,


Serguei
>
> Colin
>
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On Thursday, March 28, 2013 4:06:09 PM UTC+2, Dihital wrote:

Redirect ends current request and starts a new one, so you are right that that's the case (another action isn't called nor its template rendered).

But shouldn't you also test that admin user is still there (wasn't deleted) after redirect happened? You could have very easily have him deleted in your actual code and still redirect to root_path, making this spec pass incorrectly.

I am try test how many requests can be available for one server in Ruby
On Rails but i don't know how to do?
I read some Page but i want ask some one can explaint more clearly this
problem.
If someone had done this problem can give me some advice?Thanks

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On Thu, Mar 28, 2013 at 9:06 PM, haxuan lac <lists@ruby-forum.com> wrote:
> I 'm setting RVM for programing Ruby On Rails.
> I tried some instruction and setup successfully.But ruby version is
> 1.8.7 and Rails 2.3.14.
> I tried update Ruby by :Uninstall RVM then install curl,setup ruby 1.9.3
> p125,gem install rails ....,and Ruby ,Rails version Update
> successfully.. But after close Terminal the version of Ruby,Rails...
> same as first (ruby 1.8.7 and rails 2.3.14...).
> Someone can explain this problem for me?Thanks

rvm use ruby-1.9.3-p125@gemset --default

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I 'm setting RVM for programing Ruby On Rails.
I tried some instruction and setup successfully.But ruby version is
1.8.7 and Rails 2.3.14.
I tried update Ruby by :Uninstall RVM then install curl,setup ruby 1.9.3
p125,gem install rails ....,and Ruby ,Rails version Update
successfully.. But after close Terminal the version of Ruby,Rails...
same as first (ruby 1.8.7 and rails 2.3.14...).
Someone can explain this problem for me?Thanks

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haxuan lac wrote in post #1103550:
> Thank Robert
> I read in http://guides.rubyonrails.org/performance_testing.html
> I found with Wall Time,Process Time,User Time,Objects...Can I use this
> value same as test response time for 1 request in ROR.Thanks....

If you have performance test cases then sure. I haven't tried these
myself, but I would imaging that this gathers the times that are shown
in the Rails log file and outputs them in a more presentable format.

I wasn't really considering test cases because your original question
sounded like you were looking for sort of 1-off benchmarks. I also
noticed from that guid the "rails benchmark" command for performing
1-off benchmarks. You might look into that.

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On 28 March 2013 19:35, Serguei Cambour <s.cambour@gmail.com> wrote:
> Recently I discovered one thing I didn't even think about, or I believed it
> to work absolutely differently.
> So, to explain it, given the following models:
>
> class Project < AR
> has_many :participants
> end
>
> class Participant < AR
> belongs_to :project
> end
>
> Here is what is going in the console:
>
> irb(main):003:0> p=Project.create(:name=>'java')
> ←[1m←[36m (0.0ms)←[0m ←[1mSAVEPOINT active_record_1←[0m
> ←[1m←[35mSQL (43.0ms)←[0m INSERT INTO "projects" ("created_at", "name",
> "updated_at") VALUES (?, ?, ?) [["
> created_at", Thu, 28 Mar 2013 19:27:06 UTC +00:00], ["name", "java"],
> ["updated_at", Thu, 28 Mar 2013 19:27:06
> UTC +00:00]]
> ←[1m←[36m (0.0ms)←[0m ←[1mRELEASE SAVEPOINT active_record_1←[0m
> => #<Project id: 1, name: "java", created_at: "2013-03-28 19:27:06",
> updated_at: "2013-03-28 19:27:06">
> irb(main):004:0> p.participants
> ←[1m←[35mParticipant Load (0.0ms)←[0m SELECT "participants".* FROM
> "participants" WHERE "participants"."pro
> ject_id" = 1
> => []
> irb(main):005:0> part = p.participants.new(username:'toto')
> => #<Participant id: nil, username: "toto", project_id: 1, created_at: nil,
> updated_at: nil>
> irb(main):006:0> p.participants
> => [#<Participant id: nil, username: "toto", project_id: 1, created_at: nil,
> updated_at: nil>]
>
> I always believed that the collection of participants should keep the same
> size (zero in the above case) until I call save on the Project object. As
> you see the collection has been changed by 1, despite the record has not
> been yet save to the database; Is it a normal behaviour ?

You have added one to the collection so it appears in the collection
in memory. Note that there is no need to save the project object in
order to add to its collection as nothing in the project object
changes. It is the participant that must be saved at some point,
otherwise it will be lost.

Colin

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Thank Robert
I read in http://guides.rubyonrails.org/performance_testing.html
I found with Wall Time,Process Time,User Time,Objects...Can I use this
value same as test response time for 1 request in ROR.Thanks....

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Recently I discovered one thing I didn't even think about, or I believed it to work absolutely differently.
So, to explain it, given the following models:

class Project < AR
  has_many :participants
end

class Participant < AR
  belongs_to :project
end

Here is what is going in the console:

irb(main):003:0> p=Project.create(:name=>'java')
  ←[1m←[36m (0.0ms)←[0m  ←[1mSAVEPOINT active_record_1←[0m
  ←[1m←[35mSQL (43.0ms)←[0m  INSERT INTO "projects" ("created_at", "name", "updated_at") VALUES (?, ?, ?)  [["
created_at", Thu, 28 Mar 2013 19:27:06 UTC +00:00], ["name", "java"], ["updated_at", Thu, 28 Mar 2013 19:27:06
 UTC +00:00]]
  ←[1m←[36m (0.0ms)←[0m  ←[1mRELEASE SAVEPOINT active_record_1←[0m
=> #<Project id: 1, name: "java", created_at: "2013-03-28 19:27:06", updated_at: "2013-03-28 19:27:06">
irb(main):004:0> p.participants
  ←[1m←[35mParticipant Load (0.0ms)←[0m  SELECT "participants".* FROM "participants" WHERE "participants"."pro
ject_id" = 1
=> []
irb(main):005:0> part = p.participants.new(username:'toto')
=> #<Participant id: nil, username: "toto", project_id: 1, created_at: nil, updated_at: nil>
irb(main):006:0> p.participants
=> [#<Participant id: nil, username: "toto", project_id: 1, created_at: nil, updated_at: nil>]

I always believed that the collection of participants should keep the same size (zero in the above case) until I call save on the Project object. As you see the collection has been changed by 1, despite the record has not been yet save to the database; Is it a normal behaviour ?

Thanks in advance for your help.