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end end end end
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If the bid is successfully created, the newly created bid is returned with an HTTP 201 status code and the Location header is set pointing to the location of the newly created bid With the Location header set, we can determine what the newly created bid s id is For example:
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>> bid = Bidcreate(:username => 'me', :auction_id => 3, :item_id => 6, :amount => 3450) >> bidid # => 12 >> bidnew # => false
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If we tried to create the preceding bid again but without a dollar amount, we could interrogate the errors
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>> >> >> >> >> >> >> >> >> bid = Bidcreate(:username => 'me', :auction_id => 3, :item_id => 6) bidvalid # => false bidid # => nil bidnew # => true biderrorsclass # => ActiveResource::Errors biderrorssize # => 1 biderrorson_base # => "Amount can't be blank" biderrorsfull_messages # => "Amount can't be blank" biderrors[:amount] # => nil
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In this case a new Bid object is returned from the create method, but it s not valid If we try to see what its id is we also get a nil We can see what caused the create to fail by calling the ActiveResource#errors method This method behaves just like ActiveRecord#errors with one important exception On ActiveRecord if we called Errors#on, we would get the error for that attribute In the preceding example, we got a nil instead The reason is that Active Resource, unlike Active Record, doesn t know what attributes there are Active Record does a SHOW FIELDS FROM <table> to get this, but Active Resource has no equivalent The only way Active Resource knows an attribute exists is if we tell it For example:
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>> bid = Bidcreate(:username => 'me', :auction_id => 3, :item_id => 6, :amount => nil) >> bidvalid # => false >> bidid # => nil >> bidnew # => true >> biderrorsclass # => ActiveResource::Errors >> biderrorssize # => 1 >> biderrorson_base # => "Amount can't be blank"
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15: XML and Active Resource
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>> biderrorsfull_messages # => "Amount can't be blank" >> biderrors[:amount] # => "can't be blank"
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In this case we told Active Resource that there is an amount attribute through the create method As a result we can now call Errors#on without a problem
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1544 Update
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Editing an Active Resource follows the same Active Record pattern
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>> >> >> >> >> bid = Bidfind(1) bidamount # => 1050 bidamount = 1500 bidsave # => true bidreload
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>> bidamount # => 1500
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If we set the amount to nil, ActiveResourcesave would return false In this case we could interrogate ActiveResource::Errors for the reason, just as we would with create An important difference between Active Resource and Active Record is the absence of the save! and update! methods
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1545 Delete
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Removing an Active Resource can happen in two ways The first is without instantiating the Active Resource
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>> Biddelete(1)
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The other way requires instantiating the Active Resource first:
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>> bid = Bidfind(1) >> biddestroy
1546 Headers
Active Resource allows for the setting of HTTP headers on each request too This can be done in two ways The first is to set it as a variable:
class Auctions < ActiveResource::Base selfsite = 'http://localhost:3000' @headers = { 'x-flavor' => 'orange' } end
This will cause every connection to the site to include the HTTP header: HTTP-XFLAVOR: orange In our controller, we could use the header value
154 Active Resource
class AuctionController < ApplicationController def show @auction = Auctionfind_by_id_and_flavor(params[:bid], requestheaders['HTTP_X_FLAVOR']) respond_to do |format| formathtml formatxml { render :xml => @auction } end end end
The second way to set the headers for an Active Resource is to override the headers method
class Auctions < ActiveResource::Base selfsite = 'http://localhost:3000' def selfheaders { 'x-flavor' => 'orange' } end end
1547 Customizing URLs
Active Resource assumes RESTful URLs, but that doesn t always happen Fortunately, you can customize the URL prefix and collection_name Suppose we assume the following Active Resource class:
class OldAuctionSystem < ActiveResource::Base selfsite = 'http://s60:3270' selfprefix = '/cics/' selfcollection_name = 'auction_pool' end
The following URLs will be used:
OldAuctionSystemall OldAuctionSystemfind(1) OldAuctionSystem find(1)save} OldAuctionSystemdelete(1)} DELETE http://s60:3270/cics/auction_pool/1xml OldAuctionSystem create()} POST http://s60:3270/cics/auction_poolxml GET http://s60:3270/cics/auction_poolxml GET http://s60:3270/cics/auction_pool/1xml PUT http://s60:3270/cics/auction_pool/1xml
We could also change the element name used to generate XML In the preceding Active Resource, a create of an OldAuctionSystem would look like the following