Rails Join 2 table

rubyonrails-talk
#1

Hi,
I’ve 2 tables

  1. Users
  2. StatusMessages
    @user = Users.find(1)
    @status = @user.status_messages
    with these lines I’m getting the record of users and status_messages table. here I can refer in @status with @user.id for status messages of each user. in this I want to check this for each user in my code.
    is there any way to get the data - username(from Users) and status_message(from StatusMessage) in a single variable.
    ie I want to access like:
    @userstatus.username
    @userstatus.status_message

I’m using rails 3.1

Thank you,
Sayuj

#2

If @status_message is a StatusMessage then you can say
@status_message.user.name
@status_message.message
or whatever the column names are. This assumes that StatusMessage
belongs_to :user

Does that solve the problem?

If you don't want to use @status_message.user.name but would rather
say @status_message.user_name then define an instance method of
StatusMessage that returns user.name. In either case don't forget to
check for @status_message.user nil if you can ever have a message
without a user.

Colin

#3

Hi Colin,

It results:

NoMethodError in

Status_message#index

Showing /home/sayuj/work/sayuj/microblog/app/views/status_message/index.html.erb where line #9 raised:

undefined method `unscoped' for Users:Module

What I need to do to fix this?
#4

Please don't top post, it makes it difficult to follow the thread.
Insert your reply at appropriate points in the previous message.
Thanks.
If you could manage to post in plain text rather than html it would
also make life more pleasant for some of us.

Hi Colin,

It results:

NoMethodError in Status_message#index

Showing
/home/sayuj/work/sayuj/microblog/app/views/status_message/index.html.erb
where line #9 raised:

undefined method `unscoped' for Users:Module

Perhaps if you showed us the line causing the problem (and a few lines
around it) it might be easier to suggest a solution.
Also show the model class definitions for user and statusmessage.
Copy and paste the code, do not retype it.

Also tell us anything unusual about your setup. Are you using an
authorisation gem for example?

Colin

#5

Please see my code. I am using devise as authentication controller.
MODELS:
class User < ActiveRecord::Base
#has_and_belongs_to_many :roles
has_many :status_messages

Include default devise modules. Others available are:

:token_authenticatable, :encryptable, :confirmable, :lockable, :timeoutable and :omniauthable

devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable

Setup accessible (or protected) attributes for your model

attr_accessible :email, :password, :password_confirmation, :remember_me

def role?(role)

return !!self.roles.find_by_name(role.to_s.camelize)

end

end
class StatusMessage < ActiveRecord::Base
belongs_to :users
#default_scope :order => “created_at DESC”
end
CONTROLLER:
class StatusMessageController < ApplicationController
def index
@status = StatusMessage.all
end
def create
@status = StatusMessage.new
@status.user_id = current_user.id
@status.status = params[:status]
@status.save
redirect_to :action => “index”
end
end
ERB:

Home

<%= form_tag do |f| %> <%= text_area_tag :status %> <%= submit_tag "Submit" %> <% end %>
**<% @status.each do |s| %> <%= s.users.email %> <%= s.status %>
<% end %>**

ERROR MSG:

NoMethodError in

Status_message#index
Showing /home/sayuj/work/sayuj/microblog/app/views/status_message/index.html.erb where line #9 raised:

undefined method `unscoped' for Users:Module

Extracted source (around line #9):

6: <% end %>
7: <br />
8: <% @status.each do |s| %>
9: <%= s.users.email %>
10: <%= s.status %> <br />
11: <% end %>
#6

[...]
Please see my code. I am using devise as authentication controller.

MODELS:

class User < ActiveRecord::Base
#has_and_belongs_to_many :roles
has_many :status_messages
# Include default devise modules. Others available are:
# :token_authenticatable, :encryptable, :confirmable, :lockable,
:timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable

# Setup accessible (or protected) attributes for your model
attr_accessible :email, :password, :password_confirmation, :remember_me

# def role?(role)
# return !!self.roles.find_by_name(role.to_s.camelize)
# end
end

class StatusMessage < ActiveRecord::Base
belongs_to :users

That should be :user, singular.

#default_scope :order => "created_at DESC"
end

CONTROLLER:

class StatusMessageController < ApplicationController
def index
@status = StatusMessage.all
end

def create
@status = StatusMessage.new
@status.user_id = current_user.id
@status.status = params[:status]
@status.save
redirect_to :action => "index"
end

end

ERB:

<h1>Home</h1>
<%= form_tag do |f| %>
<%= text_area_tag :status %>
<%= submit_tag "Submit" %>
<% end %>
<br />
<% @status.each do |s| %>
<%= s.users.email %>

That should be s.user.email. Each message has just one user.

Colin

#7

Colin,
When I use s.user.email, it shows:

NoMethodError in

Status_message#index
Showing /home/sayuj/work/sayuj/microblog/app/views/status_message/index.html.erb where line #9 raised:

undefined method `user' for #<StatusMessage:0xb126384>

Extracted source (around line #9):

6: <% end %>
7: <br />
8: <% @status.each do |s| %>
9: <%= s.user.email %>
10: <%= s.status %> <br />
11: <% end %>
#8

> [...]
> class StatusMessage < ActiveRecord::Base
> belongs_to :users

That should be :user, singular.

Did you make this correction as I suggested previously, so it should
be belongs_to :user (each message belongs to one user so singular)

Colin

#9

[…]

class StatusMessage < ActiveRecord::Base

belongs_to :users

That should be :user, singular.

Did you make this correction as I suggested previously, so it should

be belongs_to :user (each message belongs to one user so singular)

Colin

Yes I made the changes.
Error is “undefined method `user’ for #StatusMessage:0xb126384”

#10

Could you post the code for the StatusMessage class again please?

Colin

#11

[…]

class StatusMessage < ActiveRecord::Base

belongs_to :users

That should be :user, singular.

Did you make this correction as I suggested previously, so it should

be belongs_to :user (each message belongs to one user so singular)

Colin

Yes I made the changes.

Error is “undefined method `user’ for #StatusMessage:0xb126384”

Could you post the code for the StatusMessage class again please?

class StatusMessage < ActiveRecord::Base

belongs_to :users

default_scope :order => “created_at DESC”

end

#12

[…]

class StatusMessage < ActiveRecord::Base

belongs_to :users

That should be :user, singular.

Did you make this correction as I suggested previously, so it should

be belongs_to :user (each message belongs to one user so singular)

Colin

Yes I made the changes.

Error is “undefined method `user’ for #StatusMessage:0xb126384”

Could you post the code for the StatusMessage class again please?

class StatusMessage < ActiveRecord::Base

belongs_to :users

default_scope :order => “created_at DESC”

end

I should use belongs_to :user instead of belongs_to :users

Thank you Colin.

#13

In my initial post I pointed out two errors. That was one of them.
Then later I queried whether you had made that correction and you said
you had.

Colin