Exercise 12: Wildlife Conservation

Description

• The property "name" in the table "sighting_state" can have the values: "Pending", "Ongoing", "Confirmed", "Discarded".
• This app helps track wildlife sightings reported by rangers. Rangers log sightings of species, including details like date, location, and status.
• It links sightings to species and keeps track of their confirmation state (e.g., confirmed, discarding). It helps manage species data, sightings, and the rangers involved in reporting them.
• In entity "sighting_state", name represents the state that will be displayed on the screen, label represents the value that programmer will use to filter the states, and the uuid represents a value to distinguish the states.
• Note: The value of the field "uuid" is generated automatically.

Tasks

• species/ranger/sighting/sighting_state/species_sighting: Add, Edit, Delete.
  • When the sighting is created, it will automatically become "Pending".
  • The field "Sighting state" from entity "sighting" will be read-only in edit view.
• Create a catalog for entities: "sighting_state", "sighting", "species" and "ranger".
• Create event listeners for tables that needs validations (e.g., adding a species without a name, sighting without location, etc., should not be allowed).
• Check if the sighting is available by date. If it is not → validation message.
• Add a new entity action at the sighting level “Discard sighting”:
  • It will change the sighting state to "Discarded";
  • A sighting cannot be discarded if it is in the "Confirmed" or "Ongoing" state → validation message;
  • First check if the sighting has already been discarded (it has the status "Discarded"), if it has → validation message.
• Add a new entity action at the species level "Initiate sighting":
  • Ensure that each sighting is associated with at least one species, if it is not → validation message;
  • First check if the sighting is already in the "Ongoing" state (it was already initiated), if it is → validation message;
  • After the initiation of the sighting, the state will change from "Pending" → "Ongoing";
  • A sighting cannot be initiated if it is in the "Completed" or "Discarded" state, if it has → validation message.
• Add a new entity action at the sighting level "Confirm sighting":
  • It can't be confirmed if it is "Pending" → validation message;
  • It can't be confirmed if it is "Discarded" → validation message;
  • If it is already in "Confirmed" state → validation message.
• Sighting report: species situation at sighting level (total number of species observed).
• Species report: sighting situation at species level (total number of sightings, location details).
• Ranger report: sighting situation at ranger level (total number of sightings, location details).