# Store Field - Keep an Up-To-Date Game Deadline
In this section, you will:
- Implement a deadline.
- Work with dates.
- Extend your unit tests.
In the previous section you introduced a FIFO that keeps the oldest games at its head and the most recently updated games at its tail.
Just because a game has not been updated in a while does not mean that it has expired. To ascertain this you need to add a new field to a game,
deadline, and test against it.
# New information
To prepare the field, add in the
StoredGame's Protobuf definition:
To have Ignite CLI and Protobuf recompile this file, use:
On each update the deadline will always be now plus a fixed duration. In this context, now refers to the block's time. Declare this duration as a new constant, plus how the date is to be represented, i.e. encoded in the saved game as a string:
# Date manipulation
Helper functions can encode and decode the deadline in the storage.
Define a new error:
Add your date helpers. A reasonable location to pick is
sdkerrors.Wrapf(err, ...)conveniently returns
Add a function that encapsulates how the next deadline is calculated in the same file:
# Updated deadline
Next, you need to update this new field with its appropriate value:
At creation, in the message handler for game creation:
After a move, in the message handler:
Confirm that your project still compiles:
# Unit tests
After these changes, your previous unit tests fail. Fix them by adding
Deadline wherever it should be. Do not forget that the time is taken from the block's timestamp. In the case of tests, it is stored in the context's
ctx.BlockTime(). In effect, you need to add this single line:
# Interact via the CLI
There is not much to test here. Remember that you added a new field, but if your blockchain state already contains games then they are missing the new field:
This demonstrates some missing information:
In effect, your blockchain state is broken. Examine the section on migrations to see how to update your blockchain state to avoid such a breaking change. This broken state still lets you test the update of the deadline on play:
In the same vein, you can create a new game and confirm it contains the deadline.
# Next up
You have created and updated the deadline. The section two steps ahead describes how to use the deadline.
Before you can do that, there is one other field you need to add. Discover which in the next section.