discourse/lib/tasks/db.rake

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# we should set the locale before the migration
task 'set_locale' do
I18n.locale = (SiteSetting.default_locale || :en) rescue :en
end
task 'db:environment:set', [:multisite] => [:load_config] do |_, args|
if Rails.env.test? && !args[:multisite]
system("MULTISITE=multisite rails db:environment:set['true'] RAILS_ENV=test")
end
end
task 'db:create', [:multisite] => [:load_config] do |_, args|
if Rails.env.test? && !args[:multisite]
system("MULTISITE=multisite rails db:create['true']")
end
end
task 'db:drop', [:multisite] => [:load_config] do |_, args|
if Rails.env.test? && !args[:multisite]
system("MULTISITE=multisite rails db:drop['true']")
end
end
# we need to run seed_fu every time we run rails db:migrate
task 'db:migrate', [:multisite] => ['environment', 'set_locale'] do |_, args|
SeedFu.seed
Jobs::Onceoff.enqueue_all
if Rails.env.test? && !args[:multisite]
system("rails db:schema:dump")
system("MULTISITE=multisite rails db:schema:load")
system("RAILS_DB=discourse_test_multisite rails db:migrate['multisite']")
end
end
task 'test:prepare' => 'environment' do
I18n.locale = SiteSetting.default_locale rescue :en
SeedFu.seed
end
task 'db:api_test_seed' => 'environment' do
puts "Loading test data for discourse_api"
load Rails.root + 'db/api_test_seeds.rb'
end
def print_table(array)
width = array[0].keys.map { |k| k.to_s.length }
cols = array[0].keys.length
array.each do |row|
row.each_with_index do |(_, val), i|
width[i] = [width[i].to_i, val.to_s.length].max
end
end
array[0].keys.each_with_index do |col, i|
print col.to_s.ljust(width[i], ' ')
if i == cols - 1
puts
else
print ' | '
end
end
puts "-" * (width.sum + width.length)
array.each do |row|
row.each_with_index do |(_, val), i|
print val.to_s.ljust(width[i], ' ')
if i == cols - 1
puts
else
print ' | '
end
end
end
end
desc 'Statistics about database'
task 'db:stats' => 'environment' do
sql = <<~SQL
select table_name,
(
select reltuples::bigint
from pg_class
where oid = ('public.' || table_name)::regclass
) AS row_estimate,
pg_size_pretty(pg_relation_size(quote_ident(table_name))) size
from information_schema.tables
where table_schema = 'public'
order by pg_relation_size(quote_ident(table_name)) DESC
SQL
puts
print_table(Post.exec_sql(sql).to_a)
end
desc 'Rebuild indexes'
task 'db:rebuild_indexes' => 'environment' do
if Import::backup_tables_count > 0
raise "Backup from a previous import exists. Drop them before running this job with rake import:remove_backup, or move them to another schema."
end
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Discourse.enable_readonly_mode
backup_schema = Jobs::Importer::BACKUP_SCHEMA
table_names = User.exec_sql("select table_name from information_schema.tables where table_schema = 'public'").map do |row|
row['table_name']
end
begin
# Move all tables to the backup schema:
User.exec_sql("DROP SCHEMA IF EXISTS #{backup_schema} CASCADE")
User.exec_sql("CREATE SCHEMA #{backup_schema}")
table_names.each do |table_name|
User.exec_sql("ALTER TABLE public.#{table_name} SET SCHEMA #{backup_schema}")
end
# Create a new empty db
Rake::Task["db:migrate"].invoke
# Fetch index definitions from the new db
index_definitions = {}
table_names.each do |table_name|
index_definitions[table_name] = User.exec_sql("SELECT indexdef FROM pg_indexes WHERE tablename = '#{table_name}' and schemaname = 'public';").map { |x| x['indexdef'] }
end
# Drop the new tables
table_names.each do |table_name|
User.exec_sql("DROP TABLE public.#{table_name}")
end
# Move the old tables back to the public schema
table_names.each do |table_name|
User.exec_sql("ALTER TABLE #{backup_schema}.#{table_name} SET SCHEMA public")
end
# Drop their indexes
index_names = User.exec_sql("SELECT indexname FROM pg_indexes WHERE schemaname = 'public' AND tablename IN ('#{table_names.join("', '")}')").map { |x| x['indexname'] }
index_names.each do |index_name|
begin
puts index_name
User.exec_sql("DROP INDEX public.#{index_name}")
rescue ActiveRecord::StatementInvalid
# It's this:
# PG::Error: ERROR: cannot drop index category_users_pkey because constraint category_users_pkey on table category_users requires it
# HINT: You can drop constraint category_users_pkey on table category_users instead.
end
end
# Create the indexes
table_names.each do |table_name|
index_definitions[table_name].each do |index_def|
begin
User.exec_sql(index_def)
rescue ActiveRecord::StatementInvalid
# Trying to recreate a primary key
end
end
end
rescue
# Can we roll this back?
raise
ensure
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Discourse.disable_readonly_mode
end
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end