Feature Request: basic scalar operations on Forbidden Relation constraints

[bpkroth]

A thought I'd had related to Forbidden Relations and/or Conditional Relations (which I think don't quite exist yet?): right now there's only basic comparison support. What about adding basic scalar operations to those comparison as well? For instance:

# constraint: buffer_size_mb < vm_size_gb * 1024
ForbiddenLessThanRelation(target_relation="buffer_size_mb", constraint_expr="vm_ram_gb * 1024")

# constraint: buffer_size_1 + buffer_size_2 < vm_size
ForbiddenGreaterThanRelation(target_relation="vm_size", constraint_expr="buffer_size_1 + buffer_size_2")

Originally posted by @bpkroth in #352 (comment)

[bpkroth]

See Also: #352 (comment)