Hi,
I'm updating a small site to include ecommerce functionality for the
single product they sell, and this is my first experience with Ruby
(I'm more familiar with PHP, though I've come to much prefer Ruby).
The site was built with Sinatra and DataMapper (DM), and I'm trying to
figure out the best way to use DataMapper with ActiveMerchant (which
really seems like the most mature Ruby payment gateway solution).
Unfortunately, all the tutorials/literature about setting up
ActiveMerchant assume the developer is using Rails and ActiveRecord
(AR), and there are a few questions I haven't been able to find clear
answers to in either the DataMapper documentation or via Google.
E.g., I'm using a PeepCode tutorial which does a nice job of
explaining ActiveMerchant in a Rails context by creating a stripped
down sample app. Here's a relevant code portion from the tutorial,
I've indicated the points I need help on with <-[#] indicators.
# ActiveRecord code
class Order < ActiveRecord::Base
has_many :order_transactions,
:dependent => :destroy <-[1]
# some code...
def authorize_payment(credit_card, options = {})
# some code...
transaction do <-[2]
authorization = OrderTransaction.authorize(amount, credit_card,
options)
order_transactions.push(authorization) <-[3]
# some code...
end
end
end
1. I understand that I need to require 'dm-constraints' in order to
realize foreign key constraint functionality in DM, but I get an error
when I call DataMapper.auto_migrate! in my app file (below):
/Library/Ruby/Gems/1.8/gems/dm-core-0.10.1/lib/dm-core/adapters/
data_objects_adapter.rb:162:in `execute_non_query': Can't create table
'./store_db/#sql-8d7_119.frm' (errno: 150) (DataObjects::SQLError)
from /Library/Ruby/Gems/1.8/gems/dm-core-0.10.1/lib/dm-core/adapters/
data_objects_adapter.rb:162:in `execute'
from /Library/Ruby/Gems/1.8/gems/dm-core-0.10.1/lib/dm-core/adapters/
data_objects_adapter.rb:266:in `with_connection'
from /Library/Ruby/Gems/1.8/gems/dm-core-0.10.1/lib/dm-core/adapters/
data_objects_adapter.rb:160:in `execute'
from /Library/Ruby/Gems/1.8/gems/dm-constraints-0.10.1/lib/dm-
constraints/migrations.rb:86:in `create_relationship_constraint'
from /Library/Ruby/Gems/1.8/gems/dm-constraints-0.10.1/lib/dm-
constraints/migrations.rb:268:in `send'
from /Library/Ruby/Gems/1.8/gems/dm-constraints-0.10.1/lib/dm-
constraints/migrations.rb:268:in `execute_each_relationship'
from /Library/Ruby/Gems/1.8/gems/dm-constraints-0.10.1/lib/dm-
constraints/migrations.rb:267:in `each_value'
from /Library/Ruby/Gems/1.8/gems/dm-constraints-0.10.1/lib/dm-
constraints/migrations.rb:267:in `execute_each_relationship'
from /Library/Ruby/Gems/1.8/gems/dm-constraints-0.10.1/lib/dm-
constraints/migrations.rb:258:in `auto_migrate_up_with_constraints!'
from /Library/Ruby/Gems/1.8/gems/dm-core-0.10.1/lib/dm-core/
migrations.rb:49:in `send'
from /Library/Ruby/Gems/1.8/gems/dm-core-0.10.1/lib/dm-core/
migrations.rb:49:in `repository_execute'
from /Library/Ruby/Gems/1.8/gems/dm-core-0.10.1/lib/dm-core/model/
descendant_set.rb:33:in `each'
from /Library/Ruby/Gems/1.8/gems/dm-core-0.10.1/lib/dm-core/model/
descendant_set.rb:33:in `each'
from /Library/Ruby/Gems/1.8/gems/dm-core-0.10.1/lib/dm-core/
migrations.rb:48:in `repository_execute'
from /Library/Ruby/Gems/1.8/gems/dm-constraints-0.10.1/lib/dm-
constraints/migrations.rb:23:in `auto_migrate_up!'
from /Library/Ruby/Gems/1.8/gems/dm-core-0.10.1/lib/dm-core/
migrations.rb:22:in `auto_migrate!'
from store.rb:36
Is there some conflict with auto_migrate! and dm-constraints that I
need to work around?
2. How do I use transactions in DM? In AR, it appears to simply be:
transaction do
#some code...
end
In the DM api, I see there's a DataMapper::Transaction class. Would I
do something like the following:
transaction = DataMapper::Transaction.new(DataMapper.repository
(:default))
transaction.begin
transaction.commit do
#some code...
end
Is this even close to right?
3. In AR, the .push method appears to create new through associations,
e.g.:
class Order < ActiveRecord::Base
has_many :order_transactions
# some code...
order_transactions.push(some_object)
end
What would be the DM equivalent, e.g. for:
class Order
include DataMapper::Resource
# some properties...
has n, :order_transactions
???
end
Apologies in advance if this stuff seems basic, I'm just trying to get
more familiar with using DataMapper and Ruby. Any help is sincerely
appreciated!
Cheers,
Jeff
p.s., hope the code formatting doesn't end up too bad.
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