Javi Martín 6da53b5716 Add unique index to poll voters table
Note that Rails 7.1 changes `find_or_create_by!` so it calls
`create_or_find_by!` when no record is found, meaning we'll rarely get
`RecordNotUnique` exceptions when using this method during a race
condition.

Adding this index means we need to remove the uniqueness validation.
According to the `create_or_find_by` documentation [1]:

> Columns with unique database constraints should not have uniqueness
> validations defined, otherwise create will fail due to validation
> errors and find_by will never be called.

We're adding a test that checks what happens when using
`create_or_find_by!`.

Note that we're creating voters combining `create_with` with
`find_or_create_by!`. Using `find_or_create_by!(...)` with all
attributes (including non-key ones like `origin`) fails when a voter
already exists with different values, e.g. an existing `origin: "web"`
and an incoming `"booth"`. In this situation the existing record is not
matched and the unique index raises an exception.

`create_with(...).find_or_create_by!(user: ..., poll: ...)` searches by
the unique key only and applies the extra attributes only on creation.
Existing voters are returned unchanged, which is the intended behavior.

For the `take_votes_from` method, we're handling a (highly unlikely, but
theoretically possible) scenario where a user votes at the same time as
taking voters from another user. For that, we're doing something similar
to what `create_or_find_by!` does: we're updating the `user_id` column
inside a new transaction (using a new transactions avoids a
`PG::InFailedSqlTransaction` exception when there are duplicate
records), and deleting the existing voter when we get a
`RecordNotUnique` exception.

On `Poll::WebVote` we're simply raising an exception when there's
already a user who's voted via booth, because the `Poll::WebVote#update`
method should never be called in this case.

We still need to use `with_lock` in `Poll::WebVote`, but not due to
duplicate voters (`find_or_create_by!` method will now handle the unique
record scenario, even in the case of simultaneous transactions), but
because we use a uniqueness validation in `Poll::Answer`; this
validation would cause an error in simultaneous transactions.

[1] https://api.rubyonrails.org/v7.1/classes/ActiveRecord/Relation.html#method-i-create_or_find_by
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CONSUL DEMOCRACY logo

CONSUL DEMOCRACY

Citizen Participation and Open Government Application

License: AGPL v3 Accessibility conformance

Build status Code Climate Coverage Status Crowdin Knapsack Pro Parallel CI builds for RSpec tests

Help wanted

This is the opensource code repository of the eParticipation website CONSUL DEMOCRACY, originally developed for the Madrid City government eParticipation website, and currently maintained by the open source software community in collaboration with the CONSUL DEMOCRACY Foundation.

Documentation

Check the ongoing documentation to learn more about how to start your own CONSUL DEMOCRACY fork, install it, customize it and learn to use it as an administrator/maintainer.

CONSUL DEMOCRACY Foundation and project website

You can access the main website of the project at http://consuldemocracy.org where you can find information about the use of the platform, the CONSUL DEMOCRACY Foundation, the global community of users and local partners, news, and ways to get more support or get in touch.

Configuration for development and test environments

NOTE: The installation process will vary depending on your operating system. Please make sure to follow the Local Installation Guide appropriate for your OS.

Prerequisites: install git, Ruby 3.3.8, CMake, pkg-config, Node.js 20.19.2, ImageMagick and PostgreSQL (>=9.5).

Note: The bin/setup command below might fail if you've configured a username and password for PostgreSQL. If that's the case, edit the lines containing username: and password: (adding your credentials) in the config/database.yml file and run bin/setup again.

git clone https://github.com/consuldemocracy/consuldemocracy.git
cd consuldemocracy
bin/setup
bin/rake db:dev_seed

Run the app locally:

bin/rails s

You can run the tests with:

bin/rspec

Note: running the whole test suite on your machine might take more than an hour, so it's strongly recommended that you setup a Continuous Integration system in order to run them using parallel jobs every time you open or modify a pull request (if you use GitHub Actions or GitLab CI, this is already configured in .github/workflows/tests.yml and .gitlab-ci.yml) and only run tests related to your current task while developing on your machine. When you configure the application for the first time, it's recommended that you run at least one test in spec/models/ and one test in spec/system/ to check your machine is properly configured to run the tests.

You can use the default admin user from the seeds file:

user: admin@consul.dev pass: 12345678

But for some actions like voting, you will need a verified user, the seeds file also includes one:

user: verified@consul.dev pass: 12345678

Configuration for production environments

See installer

Current state

Development started on 2015 July 15th. Code was deployed to production on 2015 september 7th to decide.madrid.es. Since then new features are added often. You can take a look at the current features at the project's website and future features at the Roadmap and open issues list.

License

Code published under AFFERO GPL v3 (see LICENSE-AGPLv3.txt)

Contributions

See CONTRIBUTING.md

Description
This is the repository for a demo instance for Nairobi County
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