Allow forward references in instance_of queries.

[JohananOppongAmoateng]

Closes #505

[codecov]

Codecov Report

❌ Patch coverage is 72.41379% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.12%. Comparing base (e371c50) to head (a86ce68).

Files with missing lines	Patch %	Lines
src/polymorphic/query_translate.py	72.41%	4 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #788      +/-   ##
==========================================
- Coverage   83.32%   83.12%   -0.21%     
==========================================
  Files          26       26              
  Lines        1637     1659      +22     
  Branches      261      267       +6     
==========================================
+ Hits         1364     1379      +15     
- Misses        207      211       +4     
- Partials       66       69       +3     

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[bckohan]

@JohananOppongAmoateng can you think of any real use cases that a forward reference would enable? I think the OPs desire in #505 is to put a forward reference in the condition parameter of a Constraint. Unfortunately this solution won't work for them because no polymorphic manager is involved in that scenario.

[bckohan]

I'm bumping this to 4.10+ so we can have some time to conjur up a reasonable use case. It seemed simple enough to do but if theres no real need for it then it'd just be more code to maintain.

[JohananOppongAmoateng]

@JohananOppongAmoateng can you think of any real use cases that a forward reference would enable? I think the OPs desire in #505 is to put a forward reference in the condition parameter of a Constraint. Unfortunately this solution won't work for them because no polymorphic manager is involved in that scenario.

Cant think of anything