discourse/spec/components/column_dropper_spec.rb

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require 'rails_helper'
require 'column_dropper'
RSpec.describe ColumnDropper do
def has_column?(table, column)
Topic.exec_sql("SELECT 1 FROM INFORMATION_SCHEMA.COLUMNS
WHERE
table_schema = 'public' AND
table_name = :table AND
column_name = :column
",
table: table, column: column
).to_a.length == 1
end
it "can correctly drop columns after correct delay" do
Topic.exec_sql "ALTER TABLE topics ADD COLUMN junk int"
name = Topic
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.exec_sql("SELECT name FROM schema_migration_details LIMIT 1")
.getvalue(0, 0)
Topic.exec_sql("UPDATE schema_migration_details SET created_at = :created_at WHERE name = :name",
name: name, created_at: 15.minutes.ago)
dropped_proc_called = false
ColumnDropper.drop(
table: 'topics',
after_migration: name,
columns: ['junk'],
delay: 20.minutes,
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on_drop: ->() { dropped_proc_called = true }
)
expect(has_column?('topics', 'junk')).to eq(true)
expect(dropped_proc_called).to eq(false)
ColumnDropper.drop(
table: 'topics',
after_migration: name,
columns: ['junk'],
delay: 10.minutes,
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on_drop: ->() { dropped_proc_called = true }
)
expect(has_column?('topics', 'junk')).to eq(false)
expect(dropped_proc_called).to eq(true)
end
describe '.mark_readonly' do
let(:table_name) { "table_with_readonly_column" }
before do
ActiveRecord::Base.exec_sql <<~SQL
CREATE TABLE #{table_name} (topic_id INTEGER, email TEXT);
INSERT INTO #{table_name} (topic_id, email)
VALUES (1, 'something@email.com');
SQL
ColumnDropper.mark_readonly(table_name, 'email')
end
after do
ActiveRecord::Base.connection.reset!
ActiveRecord::Base.exec_sql <<~SQL
DROP TABLE IF EXISTS #{table_name};
DROP TRIGGER IF EXISTS #{table_name}_email_readonly ON #{table_name};
SQL
end
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it 'should be droppable' do
name = Topic
.exec_sql("SELECT name FROM schema_migration_details LIMIT 1")
.getvalue(0, 0)
dropped_proc_called = false
ColumnDropper.drop(
table: table_name,
after_migration: name,
columns: ['email'],
delay: 0.minutes,
on_drop: ->() { dropped_proc_called = true }
)
expect(dropped_proc_called).to eq(true)
end
it 'should prevent updates to the readonly column' do
expect do
ActiveRecord::Base.connection.raw_connection.exec <<~SQL
UPDATE #{table_name}
SET email = 'testing@email.com'
WHERE topic_id = 1;
SQL
end.to raise_error(
PG::RaiseException,
/Discourse: email in #{table_name} is readonly/
)
end
it 'should allow updates to the other columns' do
ActiveRecord::Base.exec_sql <<~SQL
UPDATE #{table_name}
SET topic_id = 2
WHERE topic_id = 1
SQL
expect(
ActiveRecord::Base.exec_sql("SELECT * FROM #{table_name};").values
).to include([2, "something@email.com"])
end
it 'should prevent insertions to the readonly column' do
expect do
ActiveRecord::Base.connection.raw_connection.exec <<~SQL
INSERT INTO #{table_name} (topic_id, email)
VALUES (2, 'something@email.com');
SQL
end.to raise_error(
PG::RaiseException,
/Discourse: email in table_with_readonly_column is readonly/
)
end
it 'should allow insertions to the other columns' do
ActiveRecord::Base.exec_sql <<~SQL
INSERT INTO #{table_name} (topic_id)
VALUES (2);
SQL
expect(
ActiveRecord::Base.exec_sql("SELECT * FROM #{table_name} WHERE topic_id = 2;").values
).to include([2, nil])
end
end
end