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<object>dog</object> <object type="symbol">ferret</object> </objects>
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To construct a more semantic structure, the root option on to_xml triggers more expressive element names:
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>> print ['cat', 'dog', 'ferret']to_xml(:root => 'pets') < xml version="10" encoding="UTF-8" > <pets type="array"> <pet>cat</pet> <pet>dog</pet> <pet>ferret</pet> </pets>
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Ruby hashes are naturally representable in XML, with keys corresponding to element names, and their values corresponding to element contents Rails automatically calls to_s on the values to get string values for them:
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>> print({:owners => ['Chad', 'Trixie'], :pets => ['cat', 'dog', 'ferret'], :id => 123}to_xml(:root => 'registry')) < xml version="10" encoding="UTF-8" > <registry> <pets type="array"> <pet>cat</pet> <pet>dog</pet> <pet>ferret</pet> </pets> <owners type="array"> <owner>Chad</owner> <owner>Trixie</owner> </owners> <id type="integer">123</id> </registry>
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JoshG says
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This simplistic serialization may not be appropriate for certain interoperability contexts, especially if the output must pass XML Schema (XSD) validation when the order of elements is often important In Ruby 18x, the Hash class does not order keys for enumeration In Ruby 19x, the Hash class uses insertion order Neither of these may be adequate for producing output that matches an XSD The section The XML Builder will discuss Builder::XmlMarkup to address this situation
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The :include option of to_xml is not used on Array and Hash objects
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151 The to xml Method
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By default, Active Record s to_xml method only serializes persistent attributes into XML However, there are times when transient, derived, or calculated values need to be serialized out into XML form as well For example, our User model has a method that returns only draft timesheets:
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class User < ActiveRecord::Base def draft_timesheets timesheetsdraft end end
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To include the result of this method when we serialize the XML, we use the :methods parameter:
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>> print Userfind_by_login('obie')to_xml(:methods => :draft_timesheets) < xml version="10" encoding="UTF-8" > <user> <id type="integer">8</id> <draft-timesheets type="array"> <draft-timesheet> <created-at type="datetime">2010-05-18T19:31:40Z</created-at> <updated-at type="datetime">2010-05-18T19:31:40Z</updated-at> <lock-version type="integer">0</lock-version> <id type="integer">9</id> <user-id type="integer">8</user-id> <submitted type="boolean">false</submitted> <approver-id type="integer" nil="true"></approver-id> </draft-timesheet> <draft-timesheet> <created-at type="datetime">2010-05-11T19:31:40Z</created-at> <updated-at type="datetime">2010-05-18T19:31:40Z</updated-at> <lock-version type="integer">0</lock-version> <id type="integer">10</id> <user-id type="integer">8</user-id> <submitted type="boolean">false</submitted> <approver-id type="integer" nil="true"></approver-id> </draft-timesheet> </draft-timesheets> </user>
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We could also set the methods parameter to an array of method names to be called
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In cases where we want to include extra elements unrelated to the object being serialized, we can pass to_xml a block, or use the :procs option If we are using the same logic applied to different to_xml calls, we can construct lambdas ahead of time and use one or more of them in the :procs option They will be called with to_xml s option hash, through which we access the underlying XmlBuilder (XmlBuilder provides the principal means of XML generation in Rails
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>> current_user = Userfind_by_login('admin') >> generated_at = lambda { |opts| opts[:builder]tag!('generated-at', Timenowutciso8601) } >> generated_by = lambda { |opts| opts[:builder]tag!('generated-by', current_useremail) } >> print(Userfind_by_login('obie')to_xml(:procs => [generated_at, generated_by])) < xml version="10" encoding="UTF-8" > <user> <id type="integer">8</id> <client-id type="integer" nil="true"></client-id> <remember-token nil="true"></remember-token> <login>obie</login> <email>obie@tr3wcom</email> <timesheets-updated-at type="datetime" nil="true"></timesheets-updated-at> <generated-at>2010-05-18T19:33:49Z</generated-at> <generated-by>admin@tr3wcom</generated-by> </user> >> print Timesheetallto_xml(:procs => [generated_at, generated_by]) < xml version="10" encoding="UTF-8" > <timesheets type="array"> <timesheet> <id type="integer">8</id> <user-id type="integer">8</user-id> <submitted type="boolean">true</submitted> <approver-id type="integer">7</approver-id> <generated-at>2010-05-18T20:18:30Z</generated-at> <generated-by>admin@tr3wcom</generated-by> </timesheet> <timesheet> <id type="integer">9</id> <user-id type="integer">8</user-id> <submitted type="boolean">false</submitted>
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<approver-id type="integer" nil="true"></approver-id> <generated-at>2010-05-18T20:18:30Z</generated-at> <generated-by>admin@tr3wcom</generated-by> </timesheet> <timesheet> <id type="integer">10</id> <user-id type="integer">8</user-id> <submitted type="boolean">false</submitted> <approver-id type="integer" nil="true"></approver-id> <generated-at>2010-05-18T20:18:30Z</generated-at> <generated-by>admin@tr3wcom</generated-by> </timesheet> </timesheets>
Note that the :procs are applied to each top-level resource in the collection (or the single resource if the top level is not a collection) Use the sample application to compare the output with the output from the following:
>> print Userallto_xml(:include => :timesheets, :procs => [generated_at, generated_by])
To add custom elements only to the root node, to_xml will yield an XmlBuilder instance when given a block:
>> print(Userallto_xml { |xml| xmltag! 'generated-by', current_useremail }) < xml version="10" encoding="UTF-8" > <users type="array"> <user></user> <user></user> <generated-by>admin@tr3wcom</generated-by> </users>
Unfortunately, both :procs and the optional block are hobbled by a puzzling limitation: The record being serialized is not exposed to the procs being passed in as arguments, so only data external to the object may be added in this fashion To gain complete control over the XML serialization of Rails objects, you need to override the to_xml method and implement it yourself