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86/prepay credits #128

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Closes #86. This PR consists of only the last commit, "NERC Prepay Credits...".

Two functions have been added to the Prepayment Processor. One is to obtain the credits "snapshot". A test case has been written for this function.

the `DiscountInvoice` class is now removed. No invoice class will
now class `_prepare()` or `_process()`.

`BUSubsidyProcessor`, which handles processing for the BU subsidy,
sets `IS_DISCOUNT_BY_NERC` to `False` because the
subsidy is not provided by NERC. Because of this, `BU Balance` indicates
the money which BU (not the PI they are subsidizing) owes to the
MGHPCC.

The test cases for the BU Subsidy has been refactored to be
more robust and readable.
The `Project` field has been added to `invoice.py`
Prepayments have been implemented by a new processor, `PrepaymentProcessor`.
The full implementation for prepayments involved the following changes:
- Several new columns names have been added to `invoices/invoice.py`,
including column names for the prepay data files and for the exported
invoices
- Many invoices will now export with 4 new columns: `Prepaid Group Name`,
`Prepaid Group Institution`, `Prepaid Group Balance`, `Prepaid Group Used`
- 4 command line arguments have been added to `process_report.py`.
3 of them allows the user to pass in a local version of the prepay credits,
contacts, and projects file. The last one (`—prepay-debits`) allows passing
a local version of the prepay debits files, and defaults to fetching from s3 if not
provided
- A set of test cases have been added for `PrepaymentProcessor`

Since the implementation of this feature required a lot of logic decisions
(i.e What happens if a prepaid project is active, but has no
funds?), below is (hopefully) an exhaustive list of code logic decisions
that were made. These can also be inferred through the test cases.
- Prepay projects listed in `prepaid_projects.csv` are identified by their
project name, not project - allocation name
- Attempting to process past invoices (“backprocessing”) may result in
incorrect output due to the nature of the prepay debit ledger
- While backprocessing is not supported for past months, processing
the same invoice month twice will still return correct output. In this
case, the month’s debit entry may be will be overwritten
- Prepay balances can be used in the same month they are added.
- The time range in which prepay projects are considered “active” includes
their start and end date
- After processing of any given invoice month, debit entries for that
month will be added. I emphasize this for clarification. A debit entry
such as:

`2024-11,G1,1062.48`

Should be interpreted as:
In the period from 2024-11-01 to 2024-11-30, prepay group G1 spent $1062.48
As opposed to:
In the period from 2024-10-01 to 2024-10-31, …

- If prepay projects are “active” but their prepay group has $0 balance,
their prepay info (group name, contact email) is still included, but the
prepay balance will be displayed as $0 and the prepay used as an empty field
…r` to `util`

Since these functions are now used in more than one location (`add_insti_proc`
and `prepay_proc`), it makes sense for them to be relocated to `util`

The test case checking institution-processing has changed slightly
An optional argument, `export_NERC_credits` is added for testing
purposes, to prevent the credits files from being written
while running test cases
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Generate NERC Prepaid Group Credits CSV
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