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The long and the short of migrating to Drupal By Jeremy French

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Introduction• Part I – 10,000 ft view of migrations – Pretty pictures• Part II – Detail about migrate module – Code – No pretty pictures

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Typical Migration Progress

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by toastforbrekkieIll give you my proprietary CMS whenyou pry it from my cold, dead hands

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FeaturesTwo types of features:1. Pointless features that users insist upon2. Critical Features that users forget to mention.

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Migration Vs New buildPhoto by echiner1 Photo by Alex Pepperhill Replacing existing system is inherently more complicated than building new system

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Functionality, go with the grain Photo by Marc ArsenaultDon’t melt your Drupal

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Launch • Big bang is only an option • Can migrate pages and keep editing on old system • Can migrate traffic graduallyPhoto by Trey Ratcliff

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Shakedown• Define a time after launch to address critical bugs as they are discovered

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Part IIDetailed look at migration module, no morepictures, but some code.

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Part II Look at migration• Take Stack Exchange dump files and import into Drupal site.• Code available on githubhttps://github.com/jeremyfrench/se_migrate

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Migrate / Migrate Extras• Provide a framework for migrating content• Migrate contains the framework and migration code for core types• Migrate extras helps migrate data for popular modules – Flag – Voting API – Media …

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Migrate UI• Like views_ui it dosen’t add any functionality• Shows a list of active migrations and allows you to run them.• Also shows fields that are unmapped from source and destination

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Mapping??• Central concept is that of a mapping• A migration class will map some data to an entity/content type• In a simple case ‘fields’ will be mapped to fields in the content type

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Migrate Module Architecture

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MigrateSource• Source can be anything built in classes are – MigrateSourceCSV – MigrateSourceList – MigrateSourceMSSQL – MigrateSourceMultiItems – MigrateSourceOracle – MigrateSourceSQL – MigrateSourceXMLYou can roll your own (for example from acustom api).

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MigrateDestination• Entity types Users, Nodes, Terms.• Migrate Extras has things like files.

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MigrateMap• Contains a mapping from an id in the source system• Used for keeping track of migrations and for references.

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MigrateFieldMapping• In simple case it maps a field in the source to that in the destination.• Useful in cases where there is a 1-1 mapping.Often other tricks are needed…

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Lets look at some code.

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Summary• Migrate starts quickly but functionality is more difficult to migrate than content• Cultural Change takes time, hand holding helps.• Migrate module is awesome.

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Questions Now (or later)@JFrenchTweetjeremy@jeremyfrench.co.ukThanks to everyone for making DrupalCampLondon!