Programming Forums > Script Programming > Ruby

SirBob1701 · Jun 13th, 2006, 2:34 PM

I'm writing an app where the primary key is not automaticlly incremented. It will be a value (checked) taken from the user and put into the table. Right now i cannot do that without unsetting the primary key which will then invalidate my search options. So you can see here is the controller code

(Toggle Plain Text)

class Truck < ActiveRecord::Base
set_primary_key :vehicleID
  
  def before_create
    self.id = vehicleID
  end
  
  def before_update
    self.id = vehicleID
  end
	has_many :oils
  has_many :tows
  has_many :appearances
  has_many :brakes
  has_many :bridges
  has_many :inspections
  has_many :rdifferentials
  has_many :repairs
  has_many :treds
end

here is the view code pretty understandable

(Toggle Plain Text)

<form method="post" action="create">
<br>

<b>Vehicle Number:</b><br/>
<input id="truck_vehicleID" name="truck[vehicleID]" size="20" type="number" value=""/><br/>

<b>Vin:</b><br/>
<input id="truck_vin" name="truck[vin]" size="20" type="number" value=""/><br/>

<b>Current Mileage:</b><br/>
<input id="truck_curmileage" name="truck[curmileage]" size="20" type="number" value=""/><br/>

<b>Tag:</b><br/>
<input id="truck_plate" name="truck[plate]" size="20" type="text" value=""/><br/>

<b>Oil Change Interval:</b><br/>
<input id="truck_oilInt" name="truck[oilInt]" size="20" type="number" value=""/><br/>
</p>

<input type="submit" value="Create">

now it doesn't seem to be passing the vehicleID proplerly or something. I've tryed the controller many different ways and almost have it i think. here is it in its original that wasn't working but i think should definately worked

(Toggle Plain Text)

    def create
    @a_truck = Truck.new(@params['truck'])
    if @a_truck.save
        redirect_to :action => 'list'
        else
          render_action 'new'
        end

here is what i have now (after many changes and eventually working back to almost what i have above.

(Toggle Plain Text)

    def create
    @a_truck = Truck.new(Truck.vehicleID = :truck.vehicleID, @params['truck'])
    if @a_truck.save
        redirect_to :action => 'list'
        else
          render_action 'new'
        end

with the oringal i got the error message that in the table vehicleID is null and can't be with the new one i simple get that

undefined method `vehicleID' for :truck

ymbol

i really need hlep with this if you need more information you can ask here or check a previous thread i had with my db design and original implementations.

Arevos · Jun 13th, 2006, 3:27 PM

I don't think you need the before_create and after_create functions.

I'd advise trying to assign the primary key manually:

(Toggle Plain Text)

def create
    @a_truck = Truck.new(@params['truck'])
    @a_truck.vehicleID = @params['truck']['vehicleID']
    if @a_truck.save
        redirect_to :action => 'list'
    else
        render_action 'new'
    end
end

See if that works.

SirBob1701 · Jun 13th, 2006, 3:40 PM

nope that doesn't work.

(Toggle Plain Text)

undefined method `vehicleID=' for #<Truck:0x36425c0>
RAILS_ROOT: ./script/../config/..

Application Trace | Framework Trace | Full Trace 
c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:1789:in `method_missing'
#{RAILS_ROOT}/app/controllers/truck_controller.rb:64:in `create'

i tried something similar earlier but that didn't work either.

SirBob1701 · Jun 14th, 2006, 9:21 AM

Does anybody know how to do this? there HAS to be a way to do it its just freakin retarted if there isn't.

Arevos · Jun 14th, 2006, 10:33 AM

Have you tried asking on a RoR mailing list or forum?

SirBob1701 · Jun 14th, 2006, 10:38 AM

Ya i got nothing not a single reply.

Arevos · Jun 14th, 2006, 11:16 AM

I think the problem is that its difficult to diagnose a problem in isolation. The reason your program isn't working may possibly not be directly related to the primary key. Is it possible to provide the source and SQL schema for the system?

SirBob1701 · Jun 14th, 2006, 11:24 AM

Here are links for the shema download (mysql backup file) and the code ziped up
(note if your worried about viruses googlepages scans the files for them)
http://sirbob1701.googlepages.com/VehicleLog.zip
http://sirbob1701.googlepages.com/ba...0606141204.sql
I should also note in the schema that if you change the trucks tables primary key non of the finds work.

Arevos · Jun 14th, 2006, 11:27 AM

I'll take a look in around an hour or two when I get home.

Arevos · Jun 14th, 2006, 2:32 PM

I found a solution. It makes a strange sort of sense:

(Toggle Plain Text)

def create
    @a_truck = Truck.new(@params['truck'])
    @a_truck.id = @params['truck']['vehicleID']
    if @a_truck.save
        redirect_to :action => 'list'
    else
        render_action 'new'
    end
end

The "id" attribute doesn't appear to change if you alter the primary key, which I guess makes a bit of sense. As for setting it explicitly, I'd hazard a guess that's because the default activerecord constructor specifically avoids setting the primary key when given a hash. I guess that's to prevent accidental setting of the primary key when it's not intended. I can't say I approve...

As for your problem with linking the drivers table to the trucks table, you need a many-to-many relationship, which links two tables using an intermediate (ie. bridges). In Rails the function to do this is "has_and_belongs_to_many", which you should place in your truck.rb file:

(Toggle Plain Text)

has_and_belongs_to_many :drivers, :join_table => 'bridges', :foreign_key => 'driverssID', :association_foreign_key => 'vehicleID'

Edit: forgot the :drivers argument.

Jun 13th, 2006, 2:34 PM	#1
SirBob1701 Newbie Join Date: May 2006 Posts: 20 Rep Power: 0	Primary Key Writing I'm writing an app where the primary key is not automaticlly incremented. It will be a value (checked) taken from the user and put into the table. Right now i cannot do that without unsetting the primary key which will then invalidate my search options. So you can see here is the controller code (Toggle Plain Text) class Truck < ActiveRecord::Base set_primary_key :vehicleID def before_create self.id = vehicleID end def before_update self.id = vehicleID end has_many :oils has_many :tows has_many :appearances has_many :brakes has_many :bridges has_many :inspections has_many :rdifferentials has_many :repairs has_many :treds end class Truck < ActiveRecord::Base set_primary_key :vehicleID def before_create self.id = vehicleID end def before_update self.id = vehicleID end has_many :oils has_many :tows has_many :appearances has_many :brakes has_many :bridges has_many :inspections has_many :rdifferentials has_many :repairs has_many :treds end here is the view code pretty understandable (Toggle Plain Text) <form method="post" action="create"> <br> <b>Vehicle Number:</b><br/> <input id="truck_vehicleID" name="truck[vehicleID]" size="20" type="number" value=""/><br/> <b>Vin:</b><br/> <input id="truck_vin" name="truck[vin]" size="20" type="number" value=""/><br/> <b>Current Mileage:</b><br/> <input id="truck_curmileage" name="truck[curmileage]" size="20" type="number" value=""/><br/> <b>Tag:</b><br/> <input id="truck_plate" name="truck[plate]" size="20" type="text" value=""/><br/> <b>Oil Change Interval:</b><br/> <input id="truck_oilInt" name="truck[oilInt]" size="20" type="number" value=""/><br/> </p> <input type="submit" value="Create"> <form method="post" action="create"> <br> <b>Vehicle Number:</b><br/> <input id="truck_vehicleID" name="truck[vehicleID]" size="20" type="number" value=""/><br/> <b>Vin:</b><br/> <input id="truck_vin" name="truck[vin]" size="20" type="number" value=""/><br/> <b>Current Mileage:</b><br/> <input id="truck_curmileage" name="truck[curmileage]" size="20" type="number" value=""/><br/> <b>Tag:</b><br/> <input id="truck_plate" name="truck[plate]" size="20" type="text" value=""/><br/> <b>Oil Change Interval:</b><br/> <input id="truck_oilInt" name="truck[oilInt]" size="20" type="number" value=""/><br/> </p> <input type="submit" value="Create"> now it doesn't seem to be passing the vehicleID proplerly or something. I've tryed the controller many different ways and almost have it i think. here is it in its original that wasn't working but i think should definately worked (Toggle Plain Text) def create @a_truck = Truck.new(@params['truck']) if @a_truck.save redirect_to :action => 'list' else render_action 'new' end def create @a_truck = Truck.new(@params['truck']) if @a_truck.save redirect_to :action => 'list' else render_action 'new' end here is what i have now (after many changes and eventually working back to almost what i have above. (Toggle Plain Text) def create @a_truck = Truck.new(Truck.vehicleID = :truck.vehicleID, @params['truck']) if @a_truck.save redirect_to :action => 'list' else render_action 'new' end def create @a_truck = Truck.new(Truck.vehicleID = :truck.vehicleID, @params['truck']) if @a_truck.save redirect_to :action => 'list' else render_action 'new' end with the oringal i got the error message that in the table vehicleID is null and can't be with the new one i simple get that undefined method `vehicleID' for :truckymbol i really need hlep with this if you need more information you can ask here or check a previous thread i had with my db design and original implementations.

Jun 13th, 2006, 3:27 PM	#2
Arevos Programming Guru Join Date: Aug 2005 Location: England Posts: 1,499 Rep Power: 4	I don't think you need the before_create and after_create functions. I'd advise trying to assign the primary key manually: (Toggle Plain Text) def create @a_truck = Truck.new(@params['truck']) @a_truck.vehicleID = @params['truck']['vehicleID'] if @a_truck.save redirect_to :action => 'list' else render_action 'new' end end def create @a_truck = Truck.new(@params['truck']) @a_truck.vehicleID = @params['truck']['vehicleID'] if @a_truck.save redirect_to :action => 'list' else render_action 'new' end end See if that works.

Jun 13th, 2006, 3:40 PM	#3
SirBob1701 Newbie Join Date: May 2006 Posts: 20 Rep Power: 0	nope that doesn't work. (Toggle Plain Text) undefined method `vehicleID=' for #<Truck:0x36425c0> RAILS_ROOT: ./script/../config/.. Application Trace \| Framework Trace \| Full Trace c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:1789:in `method_missing' #{RAILS_ROOT}/app/controllers/truck_controller.rb:64:in `create' undefined method `vehicleID=' for #<Truck:0x36425c0> RAILS_ROOT: ./script/../config/.. Application Trace \| Framework Trace \| Full Trace c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:1789:in `method_missing' #{RAILS_ROOT}/app/controllers/truck_controller.rb:64:in `create' i tried something similar earlier but that didn't work either.

Jun 14th, 2006, 2:32 PM	#10
Arevos Programming Guru Join Date: Aug 2005 Location: England Posts: 1,499 Rep Power: 4	I found a solution. It makes a strange sort of sense: (Toggle Plain Text) def create @a_truck = Truck.new(@params['truck']) @a_truck.id = @params['truck']['vehicleID'] if @a_truck.save redirect_to :action => 'list' else render_action 'new' end end def create @a_truck = Truck.new(@params['truck']) @a_truck.id = @params['truck']['vehicleID'] if @a_truck.save redirect_to :action => 'list' else render_action 'new' end end The "id" attribute doesn't appear to change if you alter the primary key, which I guess makes a bit of sense. As for setting it explicitly, I'd hazard a guess that's because the default activerecord constructor specifically avoids setting the primary key when given a hash. I guess that's to prevent accidental setting of the primary key when it's not intended. I can't say I approve... As for your problem with linking the drivers table to the trucks table, you need a many-to-many relationship, which links two tables using an intermediate (ie. bridges). In Rails the function to do this is "has_and_belongs_to_many", which you should place in your truck.rb file: (Toggle Plain Text) has_and_belongs_to_many :drivers, :join_table => 'bridges', :foreign_key => 'driverssID', :association_foreign_key => 'vehicleID' has_and_belongs_to_many :drivers, :join_table => 'bridges', :foreign_key => 'driverssID', :association_foreign_key => 'vehicleID' Edit: forgot the :drivers argument.

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Jun 14th, 2006, 9:21 AM	#4
SirBob1701 Newbie Join Date: May 2006 Posts: 20 Rep Power: 0	Does anybody know how to do this? there HAS to be a way to do it its just freakin retarted if there isn't.

Jun 14th, 2006, 10:33 AM	#5
Arevos Programming Guru Join Date: Aug 2005 Location: England Posts: 1,499 Rep Power: 4	Have you tried asking on a RoR mailing list or forum?

Jun 14th, 2006, 10:38 AM	#6
SirBob1701 Newbie Join Date: May 2006 Posts: 20 Rep Power: 0	Ya i got nothing not a single reply.

Jun 14th, 2006, 11:16 AM	#7
Arevos Programming Guru Join Date: Aug 2005 Location: England Posts: 1,499 Rep Power: 4	I think the problem is that its difficult to diagnose a problem in isolation. The reason your program isn't working may possibly not be directly related to the primary key. Is it possible to provide the source and SQL schema for the system?

Jun 14th, 2006, 11:24 AM	#8
SirBob1701 Newbie Join Date: May 2006 Posts: 20 Rep Power: 0	Here are links for the shema download (mysql backup file) and the code ziped up (note if your worried about viruses googlepages scans the files for them) http://sirbob1701.googlepages.com/VehicleLog.zip http://sirbob1701.googlepages.com/ba...0606141204.sql I should also note in the schema that if you change the trucks tables primary key non of the finds work.

Jun 14th, 2006, 11:27 AM	#9
Arevos Programming Guru Join Date: Aug 2005 Location: England Posts: 1,499 Rep Power: 4	I'll take a look in around an hour or two when I get home.

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Programming Forums > Script Programming > Ruby

Primary Key Writing