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Guard creation/removal with existence checks.

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This commit is contained in:
Andreas Brandl 2018-03-21 13:36:28 +01:00
parent 5f8abe4783
commit 1059b3ab27
1 changed files with 16 additions and 6 deletions
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22
db/migrate/20180320182229_add_indexes_for_user_activity_queries.rb
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@ -6,25 +6,35 @@ class AddIndexesForUserActivityQueries < ActiveRecord::Migration
disable_ddl_transaction!
def up
add_concurrent_index :events, [:author_id, :project_id]
add_concurrent_index :user_interacted_projects, :user_id
add_concurrent_index :events, [:author_id, :project_id] unless index_exists?(:events, [:author_id, :project_id])
add_concurrent_index :user_interacted_projects, :user_id unless index_exists?(:user_interacted_projects, :user_id)
end
def down
remove_concurrent_index :events, [:author_id, :project_id]
remove_concurrent_index :events, [:author_id, :project_id] if index_exists?(:events, [:author_id, :project_id])
patch_foreign_keys do
remove_concurrent_index :user_interacted_projects, :user_id
remove_concurrent_index :user_interacted_projects, :user_id if index_exists?(:user_interacted_projects, :user_id)
end
end
private
def patch_foreign_keys
return yield if Gitlab::Database.postgresql?
# MySQL doesn't like to remove the index with a foreign key using it.
remove_foreign_key :user_interacted_projects, :users unless Gitlab::Database.postgresql?
remove_foreign_key :user_interacted_projects, :users if fk_exists?(:user_interacted_projects, :user_id)
yield
# Let's re-add the foreign key using the existing index on (user_id, project_id)
add_concurrent_foreign_key :user_interacted_projects, :users, column: :user_id unless Gitlab::Database.postgresql?
add_concurrent_foreign_key :user_interacted_projects, :users, column: :user_id unless fk_exists?(:user_interacted_projects, :user_id)
end
def fk_exists?(table, column)
foreign_keys(table).any? do |key|
key.options[:column] == column.to_s
end
end
end