Implement Exchange Out, Disposal, Gift, and Deaccession Virtual Calculated Fields

[acwhite211]

Fixes #2521

Implements the calculations done in Specify 6 into Specify 7 as virtual fields for the following:
Exchange Out:

• Total Preps (Sum of all associated exchange out preparations)
• Total Items (Sum of all associated collection object preparations)

Disposal:

• Total Preps (Sum of all associated disposal preparations)
• Total Items (Sum of all associated collection object preparations)

Gift:

• Total Preps (Sum of all associated gift preparations)
• Total Items (Sum of all associated collection object preparations)

Deaccession’s

• Total Preps (Sum of all associated disposal, gift, and exchange out preparations)
• Total Items (Sum of all associated collection object preparations)

Note: This PR is also taking the opportunity to take the existing hard-coded sql code in the calculated_fields.py file, and re-implementing it using the Django ORM.

Checklist

• Self-review the PR after opening it to make sure the changes look good
  and self-explanatory (or properly documented)
• Add relevant issue to release milestone

Testing instructions

• Go to the forms of ExchangeOut, Disposal, Gift, and Deaccession.
• Play around with adding and deleting preparations
• Ensure Total Preps and Total Items display accurate values

[acwhite211]

I found the file https://github.com/specify/specify7/blob/production/specifyweb/specify/calculated_fields.py where many of the already implemented virtual calculated fields are coded. I think it will be good to extend this file, instead of using business rules. Although this file uses manually created sql code, so it would be ideal to use the Django ORM in this file where possible.

[Areyes42]

Testing instructions

• Go to the forms of ExchangeOut, Disposal, Gift, and Deaccession.
• Play around with adding and deleting preparations
• Ensure Total Preps and Total Items display accurate values

Everything looks good! Total Preps and Total Items fields are properly calculated in each form.

[emenslin]

Testing instructions

• Go to the forms of ExchangeOut, Disposal, Gift, and Deaccession.
• Play around with adding and deleting preparations
• Ensure Total Preps and Total Items display accurate values

Looks good!

[lexiclevenger]

Testing instructions

• Go to the forms of ExchangeOut, Disposal, Gift, and Deaccession.
• Play around with adding and deleting preparations
• Ensure Total Preps and Total Items display accurate values

---

Looks good! The fields are now functioning for each interaction.

This branch seems to be causing some sort of issue in the Fitz_NHMD_Oct_2023 database, but that is the only database I've found to be affected. I will go ahead and approve it, but could someone take a look and verify whether it is an issue specific to the database or the PR? This error is thrown when opening disposal forms in this branch:

Specify 7 Crash Report - 2024-05-16T21_28_17.993Z.txt

https://fitznhmdoct2023-issue-2521-2.test.specifysystems.org/specify/view/disposal/2/

[melton-jason]

Looks good!

fixed by Alec