submit-social-housing-lettings-and-sales-data/README.md

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# Submit social housing lettings and sales data (CORE)

This is the codebase for the Ruby on Rails app that will handle the submission of lettings and sales of social housing data in England.

## API documentation

API documentation can be found here: https://communitiesuk.github.io/mhclg-data-collection-beta/. This is driven by [OpenAPI docs](docs/api/DLUHC-CORE-Data.v1.json)

## Required Setup

Pre-requisites:

- Ruby
- Rails
- Postgres

### Quick start

1. Copy the `.env.example` to `.env` and replace the database credentials with your local postgres user credentials.

2. Install the dependencies:\
  `bundle install`

3. Create the database:\
  `rake db:create`

4. Run the database migrations:\
  `rake db:migrate`

5. Install the frontend depenencies:\
  `yarn install`

6. Start the Rails server:\
  `bundle exec rails s`

The Rails server will start on <http://localhost:3000>.

### Using Docker

```sh
docker-compose build
docker-compose run --rm app rails db:create
docker-compose up
```

The Rails server will start on <http://localhost:8080>.

Note `docker-compose` runs the production docker image (`RAILS_ENV=production`) as the Dockerfile doesn’t include development gems to keep the image size down.

## Infrastructure

This application is running on [GOV.UK PaaS](https://www.cloud.service.gov.uk/). To deploy you need to:

1. Contact your organisation manager to get an account in `dluhc-core` organization and in the relevant spaces (sandbox/production).

2. [Install the Cloud Foundry CLI](https://docs.cloudfoundry.org/cf-cli/install-go-cli.html)

3. Login:\
`cf login -a api.london.cloud.service.gov.uk -u <your_username>`

4. Set your deployment target (sandbox/production):\
`cf target -o dluhc-core -s <deploy_environment>`

5. Deploy:\
`cf push dluhc-core --strategy rolling`. This will use the [manifest file](manifest.yml)

Once the app is deployed:

1. Get a Rails console:\
`cf ssh dluhc-core -t -c "/tmp/lifecycle/launcher /home/vcap/app 'rails console' ''"`

2. Check logs:\
`cf logs dluhc-core --recent`

#### Troubleshooting deployments

A failed Github deployment action will occasionally leave a Cloud Foundry deployment in a broken state. As a result all subsequent Github deployment actions will also fail with the message `Cannot update this process while a deployment is in flight`.

`
cf cancel-deployment dluhc-core
`

You'd then need to check the logs and fix the issue that caused the initial deployment to fail.

## CI/CD

When a commit is made to `main` the following GitHub action jobs are triggered:

1. **Test**: RSpec runs our test suite
2. **Deploy**: If the Test stage passes, this job will deploy the app to our GOV.UK PaaS account using the Cloud Foundry CLI

When a pull request is opened to `main` only the Test stage runs.

## Single log submission

The form for this is driven by a JSON file in `/config/forms/{start_year}_{end_year}.json`

The JSON should follow the structure:

```jsonc
{
  "form_type": "lettings" / "sales",
  "start_year": Integer, // i.e. 2020
  "end_year": Integer, // i.e. 2021
  "sections": {
    "[snake_case_section_name_string]": {
      "label": String,
      "subsections": {
        "[snake_case_subsection_name_string]": {
          "label": String,
          "pages": {
            "[snake_case_page_name_string]": {
              "header": String,
              "description": String,
              "questions": {
                "[snake_case_question_name_string]": {
                  "header": String,
                  "hint_text": String,
                  "check_answer_label": String,
                  "type": "text" / "numeric" / "radio" / "checkbox" / "date",
                  "min": Integer, // numeric only
                  "max": Integer, // numeric only
                  "step": Integer, // numeric only
                  "width": 2 / 3 / 4 / 5 / 10 / 20, // text and numeric only
                  "prefix": String, // numeric only
                  "suffix": String, //numeric only
                  "answer_options": { // checkbox and radio only
                    "0": String,
                    "1": String
                  },
                  "conditional_for": {
                    "[snake_case_question_to_enable_1_name_string]": ["condition-that-enables"],
                    "[snake_case_question_to_enable_2_name_string]": ["condition-that-enables"]
                  },
                  "inferred_answers": { "field_that_gets_inferred_from_current_field": { "is_that_field_inferred": true } },
                  "inferred_check_answers_value": {
                    "condition": { "field_name_for_inferred_check_answers_condition": "field_value_for_inferred_check_answers_condition" },
                    "value": "Inferred value that gets displayed if condition is met"
                  }
                }
              },
              "depends_on": [{ "question_key": "answer_value_required_for_this_page_to_be_shown" }]
            }
          }
        }
      }
    }
  }
}
```

Assumptions made by the format:

- All forms have at least 1 section
- All sections have at least 1 subsection
- All subsections have at least 1 page
- All pages have at least 1 question
- The ActiveRecord case log model has a field for each question name (must match). In the case of checkbox questions it must have one field for every answer option (again names must match).
- Text not required by a page/question such as a header or hint text should be passed as an empty string
- For conditionally shown questions conditions that have been implemented and can be used are:
  - Radio question answer option selected matches one of conditional e.g. ["answer-options-1-string", "answer-option-3-string"]
  - Numeric question value matches condition e.g. [">2"], ["<7"] or ["== 6"]

  Page routing:

  - Form navigation works by stepping sequentially through every page defined in the JSON form definition for the given subsection. For every page it checks if it has "depends_on" conditions. If it does, it evaluates them to determine whether that page should be show or not.

  - In this way we can build up whole branches by having:

  ```jsonc
  "page_1": { "questions": { "question_1: "answer_options": ["A", "B"] } },
  "page_2": { "questions": { "question_2: "answer_options": ["C", "D"] }, "depends_on": [{ "question_1": "A" }] },
  "page_3": { "questions": { "question_3: "answer_options": ["E", "F"] }, "depends_on": [{ "question_1": "A" }] },
  "page_4": { "questions": { "question_4: "answer_options": ["G", "H"] }, "depends_on": [{ "question_1": "B" }] },
  ```

## JSON Form Validation against Schema

To validate the form JSON against the schema you can run:
`rake form_definition:validate["config/forms/2021_2022.json"]`

n.b. You may have to escape square brackets in zsh
`rake form_definition:validate\["config/forms/2021_2022.json"\]`

This will validate the given form definition against the schema in `config/forms/schema/generic.json`.

You can also run:
`rake form_definition:validate_all`
This will validate all forms in directories = ["config/forms", "spec/fixtures/forms"]

## Useful documentation (external dependencies)

### GOV.UK Design System Form Builder for Rails

- [Examples](https://govuk-form-builder.netlify.app/)
- [Technical docs](https://www.rubydoc.info/gems/govuk_design_system_formbuilder/)
- [GitHub repository](https://github.com/DFE-Digital/govuk-formbuilder)

### GOV.UK Frontend for Rails

- [Github repository](https://github.com/DFE-Digital/govuk-components)

### GOV.UK Frontend

- [GitHub repository](https://github.com/alphagov/govuk-frontend)

### Hotwire (Turbo/Stimulus)

- [Docs](https://turbo.hotwired.dev/)