DuckRails – open source development tool for mocking dynamically API endpoints
GitHub - iridakos/duckrails: Development tool to mock API endpoints quickly and easily (docker image available)

DuckRails is a development tool.
Its main purpose is to allow developers to quickly mock API endpoints that for many possible reasons they can't reach at a specific time.

If it looks like a duck, walks like a duck and quacks like a duck, then it's a duck 🦆


How it works
The application allows creating new routes dynamically to which developers can assign static or dynamic responses:

body
headers
content type
status code

or even cause delays, timeouts etc.
Guides
The repository's wiki pages contain all you need to know.

What is DuckRails?
Setting up the application

natively
via docker


Using DuckRails

The mock form
The mock index page


Creating mocks

Route paths with variables
Static mock
Dynamic mock with embedded Ruby
Dynamic mock with JavaScript
Mock wrapping an existing API call
Advanced mock (WIP)



You can find the old DuckRails' guides at my blog.
Example
Mocks index page

Changing mocks order

Setting general mock properties

Defining the response body

Setting response headers

Setting some advanced configuration (delays, dynamic headers, content type & status)

Upon save the route becomes available to the application and you can use the endpoint:


Supported response functionality
You can define static or dynamic responses for a mock.
Currently supported dynamic types are:

Embedded Ruby
JavaScript

Embedded Ruby
When specifying dynamic content of embedded Ruby (more options to be added), you can read as local variables:

@parameters: The parameters of the request
@request: The request
@response: The response

JavaScript
When specifying dynamic content of JavaScript type, you can read as local variables:

parameters: The parameters of the request
headers: The request headers

The script should always return a string (for JSON use JSON.stringify(your_variable))
Route paths
You can specify routes and access their parts in the @parameters variable, for example:
/authors/:author_id/posts/:post_id
give you access to the parameters with:
@parameters[:author_id]
@parameters[:post_id]
Quick setup (development environment)

Clone the repository.
Copy the sample database configuration file (config/database.yml.sample) under config/database.yml and edit it to reflect your preferred db configuration (defaults to sqlite3). If you change the database adapter, make sure you include the appropriate gem in your Gemfile (ex. for mysql gem 'mysql2')
Execute bundle install to install the required gems.
Execute rake db:setup to setup the database.
Execute rails server to start the application on the default port.
Duckrails can be run concurrently and in parallelism, thus instead of the default rails server, you may start the puma server with something like: bundle exec puma -t 8:16 -w 3

Better setup (production environment)

Clone the repository.
Copy the sample database configuration file (config/database.yml.sample) under config/database.yml and edit it to reflect your preferred db configuration (defaults to sqlite3). If you change the database adapter, make sure you include the appropriate gem in your Gemfile (ex. for mysql gem 'mysql2')
Execute bundle install to install the required gems.
Export an env variable for your secret key base: export SECRET_KEY_BASE="your_secret_key_base_here"
Execute RAILS_ENV=production rake db:setup to setup the database.
Execute RAILS_ENV=production rake assets:precompile to generate the assets.
Execute bundle exec rails s -e production to start the application on the default port.
Duckrails can be run concurrently and in parallelism, thus instead of the default rails server, you may start the puma server with something like: RAILS_ENV=production bundle exec puma -t 8:16 -w 3

Database configuration
The application is by default configured to use sqlite3. If you want to use another configuration, update the config/database.yml accordingly to match your setup.
Docker
A docker image is available at docker hub under iridakos/duckrails.
To obtain the image use:
docker pull iridakos/duckrails
To start the application and bind it to a port (ex. 4000) use:
docker run -p 4000:80 iridakos/duckrails:latest
Contributing

Fork it ( https://github.com/iridakos/duckrails/fork )
Create your feature branch (git checkout -b my-new-feature)
Commit your changes (git commit -am 'Add some feature')
Push to the branch (git push origin my-new-feature)
Create a new Pull Request

License
This application is open source under the MIT License terms.
