My model object's attributes are not being saved

Hello all,
I’m into my first week of rails coding and I’m really enjoying it so
far.
I’ve run into a bit of an problem. I have a user model which represents
the
currently logged in user. I’m also creating a gas_reading model which
will
be a child of the user model. When I attempt to create and save a new
gas_reading its saving successfully without any exceptions but its not
storing the attributes. I’m logging the values directly before the save
call in the create method of my controller and they’re set correctly but
I
can see from the mongrel output that the sql being used does not contain
any
values.

I’ve been searching for a similar problem on here and haven’t managed to
find anything and I’ve tried hacking around as much as possible but not
been
able to make progress.

Any help would be really appreciated.

Here’s my code:

user.rb:

class User < ActiveRecord::Base

has_many :gas_readings

… lots of stuff around passwords and encryption

end

gas_reading.rb:

class GasReading < ActiveRecord::Base
validates_presence_of :value, :start_date, :end_date

belongs_to :user
attr_accessor :value, :start_date, :end_date
end

gas_reading_controller.rb:

GET /gas_readings/new

GET /gas_readings/new.xml

def new
@user = User.find(Integer(session[:user_id]))
@gas_reading = @user.gas_readings.build
end

POST /gas_readings

POST /gas_readings.xml

def create

logger.error "this is gas reading before #{params[:gas_reading]}"

@user = User.find(Integer(session[:user_id]))
@gas_reading = @user.gas_readings.build(params[:gas_reading])

logger.error "this is gas reading after #{@gas_reading.value} ,

#{@gas_reading.start_date} , #{@gas_reading.end_date}"

respond_to do |format|
  if @gas_reading.save
    flash[:notice] = 'GasReading was successfully created.'
    format.html { redirect_to(@gas_reading) }
  else
    format.html { render :action => "new" }
  end
end

end

This is the mongrel output when I create a new gas_reading:
Rendering gas_readings/new
Completed in 39ms (View: 11, DB: 7) | 200 OK
[http://localhost/gas_readings/new]
SQL (0.1ms) SET NAMES ‘utf8’
SQL (0.1ms) SET SQL_AUTO_IS_NULL=0

Processing GasReadingsController#create (for 127.0.0.1 at 2010-03-29
16:41:41) [POST]
Parameters: {“commit”=>“Create”,
“authenticity_token”=>“RSLUS1/MA86MXtnm2RnBIh9ksD4FAzSX2NBnu80eh8s=”,
“gas_reading”=>{“end_date”=>“03/26/2010”, “start_date”=>“03/02/2010”,
“value”=>“23423”}}
User Columns (1.9ms) SHOW FIELDS FROM users
User Load (1.0ms) SELECT * FROM users WHERE (users.id = 4)
LIMIT 1
this is gas reading before
start_date03/02/2010end_date03/26/2010value23423
User Load (0.3ms) SELECT * FROM users WHERE (users.id = 4)
GasReading Columns (2.2ms) SHOW FIELDS FROM gas_readings
this is gas reading after 23423 , 03/02/2010 , 03/26/2010
SQL (0.7ms) BEGIN
GasReading Create (0.3ms) INSERT INTO gas_readings (start_date,
end_date, updated_at, user_id, created_at) VALUES(NULL, NULL,
‘2010-03-29 15:41:41’, 4, ‘2010-03-29 15:41:41’)
SQL (26.2ms) COMMIT
Redirected to http://localhost:3000/gas_readings/9
Completed in 62ms (DB: 33) | 302 Found [http://localhost/gas_readings]


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Ah thanks for your reply. I didn’t fully understand how active
records build attribute accessors based on table names for you. Also
turns out I had named one of my columns value and it wasn’t being
added by the migration.

On Mar 29, 10:53 am, BarryOg [email protected] wrote:

Hello all,
I’m into my first week of rails coding and I’m really enjoying it so far.

Welcome!

I’ve run into a bit of an problem. I have a user model which represents the
currently logged in user. I’m also creating a gas_reading model which will
be a child of the user model. When I attempt to create and save a new
gas_reading its saving successfully without any exceptions but its not
storing the attributes.

That’s because you’re not letting ActiveRecord see those attributes.
Take out this line:

attr_accessor :value, :start_date, :end_date

You should already have these columns in your table from your
migration. attr_accessor is when you want your object to temporarily
keep track of data that is not stored in your table.

Hope this helps,

Jeff

purpleworkshops.com

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