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This moves us away from the delayed drops pattern which was problematic on two counts. First, it uses a hardcoded "delay for" duration which may be too short for certain deployment strategies. Second, delayed drop doesn't ensure that it only runs after the latest application code has been deployed. If the migration runs and the application code fails to deploy, running the migration after "delay for" has been met will cause the application to blow up. The new strategy allows post deployment migrations to be skipped if the env `SKIP_POST_DEPLOYMENT_MIGRATIONS` is provided. ``` SKIP_POST_DEPLOYMENT_MIGRATIONS=1 rake db:migrate -> deploy app servers SKIP_POST_DEPLOYMENT_MIGRATIONS=0 rake db:migrate ``` To aid with the generation of a post deployment migration, a generator has been added. Simply run `rails generate post_migration`.
37 lines
1.2 KiB
Ruby
37 lines
1.2 KiB
Ruby
require_dependency 'migration/base_dropper'
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module Migration
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class ColumnDropper
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def self.mark_readonly(table_name, column_name)
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BaseDropper.create_readonly_function(table_name, column_name)
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DB.exec <<~SQL
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CREATE TRIGGER #{BaseDropper.readonly_trigger_name(table_name, column_name)}
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BEFORE INSERT OR UPDATE OF #{column_name}
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ON #{table_name}
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FOR EACH ROW
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WHEN (NEW.#{column_name} IS NOT NULL)
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EXECUTE PROCEDURE #{BaseDropper.readonly_function_name(table_name, column_name)};
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SQL
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end
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def self.execute_drop(table, columns)
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table = table.to_s
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columns.each do |column|
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column = column.to_s
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DB.exec <<~SQL
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DROP FUNCTION IF EXISTS #{BaseDropper.readonly_function_name(table, column)} CASCADE;
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-- Backward compatibility for old functions created in the public
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-- schema
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DROP FUNCTION IF EXISTS #{BaseDropper.old_readonly_function_name(table, column)} CASCADE;
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SQL
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# safe cause it is protected on method entry, can not be passed in params
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DB.exec("ALTER TABLE #{table} DROP COLUMN IF EXISTS #{column}")
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end
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end
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end
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end
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