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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::Database::MigrationHelpers::V2 do
include Database::TriggerHelpers
let(:migration) do
ActiveRecord::Migration.new.extend(described_class)
end
before do
allow(migration).to receive(:puts)
end
shared_examples_for 'Setting up to rename a column' do
let(:model) { Class.new(ActiveRecord::Base) }
before do
model.table_name = :test_table
end
context 'when called inside a transaction block' do
before do
allow(migration).to receive(:transaction_open?).and_return(true)
end
it 'raises an error' do
expect do
migration.public_send(operation, :test_table, :original, :renamed)
end.to raise_error("#{operation} can not be run inside a transaction")
end
end
context 'when the existing column has a default value' do
before do
migration.change_column_default :test_table, existing_column, 'default value'
end
it 'raises an error' do
expect do
migration.public_send(operation, :test_table, :original, :renamed)
end.to raise_error("#{operation} does not currently support columns with default values")
end
end
context 'when passing a batch column' do
context 'when the batch column does not exist' do
it 'raises an error' do
expect do
migration.public_send(operation, :test_table, :original, :renamed, batch_column_name: :missing)
end.to raise_error('Column missing does not exist on test_table')
end
end
context 'when the batch column does exist' do
it 'passes it when creating the column' do
expect(migration).to receive(:create_column_from)
.with(:test_table, existing_column, added_column, type: nil, batch_column_name: :status)
.and_call_original
migration.public_send(operation, :test_table, :original, :renamed, batch_column_name: :status)
end
end
end
it 'creates the renamed column, syncing existing data' do
existing_record_1 = model.create!(status: 0, existing_column => 'existing')
existing_record_2 = model.create!(status: 0, existing_column => nil)
migration.send(operation, :test_table, :original, :renamed)
model.reset_column_information
expect(migration.column_exists?(:test_table, added_column)).to eq(true)
expect(existing_record_1.reload).to have_attributes(status: 0, original: 'existing', renamed: 'existing')
expect(existing_record_2.reload).to have_attributes(status: 0, original: nil, renamed: nil)
end
it 'installs triggers to sync new data' do
migration.public_send(operation, :test_table, :original, :renamed)
model.reset_column_information
new_record_1 = model.create!(status: 1, original: 'first')
new_record_2 = model.create!(status: 1, renamed: 'second')
expect(new_record_1.reload).to have_attributes(status: 1, original: 'first', renamed: 'first')
expect(new_record_2.reload).to have_attributes(status: 1, original: 'second', renamed: 'second')
new_record_1.update!(original: 'updated')
new_record_2.update!(renamed: nil)
expect(new_record_1.reload).to have_attributes(status: 1, original: 'updated', renamed: 'updated')
expect(new_record_2.reload).to have_attributes(status: 1, original: nil, renamed: nil)
end
end
describe '#rename_column_concurrently' do
before do
allow(migration).to receive(:transaction_open?).and_return(false)
migration.create_table :test_table do |t|
t.integer :status, null: false
t.text :original
t.text :other_column
end
end
it_behaves_like 'Setting up to rename a column' do
let(:operation) { :rename_column_concurrently }
let(:existing_column) { :original }
let(:added_column) { :renamed }
end
context 'when the column to rename does not exist' do
it 'raises an error' do
expect do
migration.rename_column_concurrently :test_table, :missing_column, :renamed
end.to raise_error('Column missing_column does not exist on test_table')
end
end
end
describe '#undo_cleanup_concurrent_column_rename' do
before do
allow(migration).to receive(:transaction_open?).and_return(false)
migration.create_table :test_table do |t|
t.integer :status, null: false
t.text :other_column
t.text :renamed
end
end
it_behaves_like 'Setting up to rename a column' do
let(:operation) { :undo_cleanup_concurrent_column_rename }
let(:existing_column) { :renamed }
let(:added_column) { :original }
end
context 'when the renamed column does not exist' do
it 'raises an error' do
expect do
migration.undo_cleanup_concurrent_column_rename :test_table, :original, :missing_column
end.to raise_error('Column missing_column does not exist on test_table')
end
end
end
shared_examples_for 'Cleaning up from renaming a column' do
let(:connection) { migration.connection }
before do
allow(migration).to receive(:transaction_open?).and_return(false)
migration.create_table :test_table do |t|
t.integer :status, null: false
t.text :original
t.text :other_column
end
migration.rename_column_concurrently :test_table, :original, :renamed
end
context 'when the helper is called repeatedly' do
before do
migration.public_send(operation, :test_table, :original, :renamed)
end
it 'does not make repeated attempts to cleanup' do
expect(migration).not_to receive(:remove_column)
expect do
migration.public_send(operation, :test_table, :original, :renamed)
end.not_to raise_error
end
end
context 'when the renamed column exists' do
let(:triggers) do
[
['trigger_7cc71f92fd63', 'function_for_trigger_7cc71f92fd63', before: 'insert'],
['trigger_f1a1f619636a', 'function_for_trigger_f1a1f619636a', before: 'update'],
['trigger_769a49938884', 'function_for_trigger_769a49938884', before: 'update']
]
end
it 'removes the sync triggers and renamed columns' do
triggers.each do |(trigger_name, function_name, event)|
expect_function_to_exist(function_name)
expect_valid_function_trigger(:test_table, trigger_name, function_name, event)
end
expect(migration.column_exists?(:test_table, added_column)).to eq(true)
migration.public_send(operation, :test_table, :original, :renamed)
expect(migration.column_exists?(:test_table, added_column)).to eq(false)
triggers.each do |(trigger_name, function_name, _)|
expect_trigger_not_to_exist(:test_table, trigger_name)
expect_function_not_to_exist(function_name)
end
end
end
end
describe '#undo_rename_column_concurrently' do
it_behaves_like 'Cleaning up from renaming a column' do
let(:operation) { :undo_rename_column_concurrently }
let(:added_column) { :renamed }
end
end
describe '#cleanup_concurrent_column_rename' do
it_behaves_like 'Cleaning up from renaming a column' do
let(:operation) { :cleanup_concurrent_column_rename }
let(:added_column) { :original }
end
end
end
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