7384 mdm expansion search impacts the search operation with conditional references

[YalingPeiS]

Problem Statement

Search operation with chained referencing is not working after enabling MDM expansion search.

Description

When MDM expansion search is enabled, search operations with chained reference are failing.
Example: http://localhost:8000/AllergyIntolerance?patient.identifier=https://test.com/fhir/NamingSystem/hw-1222%7Cpaaaid1102101

This worked fine before enabling the MDM expansion search. but doesn't work after enabling it. Below is the error message

{
    "resourceType": "OperationOutcome",
    "issue": [
        {
            "severity": "error",
            "code": "processing",
            "diagnostics": "HAPI-2001: Resource NamingSystem/hw-1222|paaaid1102101 is not known"
        }
    ]
}

Cause

It is noticed that the existing MDM expansion on chained or conditional reference search behaved differently for the user with FHIR_AUTO_MDM permission and the user without this permission.

• When the user (e.g. admin) has FHIR_AUTO_MDM, conditional reference search failed with 404 resource not known error as described in the ticket due to search param parsing error.
• When the user does not have FHIR_AUTO_MDM, conditional reference search would succeed with 200 response. However, the search did not perform MDM-expansion at all.

Fix

A 400 bad request error will be thrown if MDM expansion is attempted on a chain.

Closes #7384

[robogary]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.78%. Comparing base (112cec3) to head (bc35e27).
⚠️ Report is 181 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7393      +/-   ##
============================================
+ Coverage     83.41%   83.78%   +0.37%     
- Complexity    29193    30180     +987     
============================================
  Files          1843     1833      -10     
  Lines        113422   116599    +3177     
  Branches      14251    14808     +557     
============================================
+ Hits          94608    97694    +3086     
+ Misses        12730    12609     -121     
- Partials       6084     6296     +212     

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