instructions.md

Your community association has asked you to implement a simple registry application to manage the community garden registrations. The Plot struct has already been provided for you.

1. Open the garden

Implement the CommunityGarden.start/1 function, it should receive a optional keyword list of options to pass forward to the agent process. The garden's initial state should be initialized to represent an empty collection of plots. It should return an :ok tuple with the garden's pid.

{:ok, pid} = CommunityGarden.start()
# => {:ok, #PID<0.112.0>}

2. List the registrations

Implement the CommunityGarden.list_registrations/1 function. It should receive the pid for the community garden. It should return a list of the stored plots that are registered.

CommunityGarden.list_registrations(pid)
# => []

At this point, we haven't added the ability to register a plot, so this list should be empty

3. Register plots to a person

Implement the CommunityGarden.register/2 function. It should receive the pid for the community garden and a name to register the plot. It should return the Plot struct with the plot's id and person registered to when it is successful.

CommunityGarden.register(pid, "Emma Balan")
# => %Plot{plot_id: 1, registered_to: "Emma Balan"}
CommunityGarden.list_registrations(pid)
# => [%Plot{plot_id: 1, registered_to: "Emma Balan"}]

4. Release plots

Implement the CommunityGarden.release/2 function. It should receive the pid and id of the plot to be released. It should return :ok on success. When a plot is released, the id is not re-used, it is used as a unique identifier only.

CommunityGarden.release(pid, 1)
# => :ok
CommunityGarden.list_registrations(pid)
# => []

5. Get a registered plot

Implement the CommunityGarden.get_registration/2 function. It should receive the pid and id of the plot to be checked. It should return the plot if it is registered, and :not_found if it is unregistered.

CommunityGarden.get_registration(pid, 1)
# => %Plot{plot_id: 1, registered_to: "Emma Balan"}
CommunityGarden.get_registration(pid, 7)
# => {:not_found, "plot is unregistered"}