refactor(data-generators): centralize FHIR Coding creation into shared utilities and refactor generators to use it (refs #141)

Author: debangshu919

healthchain/data_generators/basegenerators.py

@@ -9,6 +9,7 @@
 
 from fhir.resources.codeableconcept import CodeableConcept
 from fhir.resources.coding import Coding
+from healthchain.data_generators.coding_utils import create_coding
 
 
 faker = Faker()
@@ -195,11 +196,10 @@ def generate_from_valueset(ValueSet):
 
         return CodeableConcept(
             coding=[
-                Coding(
+                create_coding(
                     system=value_set_instance.system,
                     code=code,
                     display=display,
-                    # extension=[Extension(value_set_instance.extension)],
                 )
             ]
         )

healthchain/data_generators/coding_utils.py

@@ -0,0 +1,30 @@
+from typing import Optional, Dict, Any
+
+# Common system URIs
+SNOMED_CT_URI = "http://snomed.info/sct"
+ICD10_URI = "http://hl7.org/fhir/sid/icd-10"
+LOINC_URI = "http://loinc.org"
+
+
+def create_coding(
+    code: str,
+    system: str,
+    display: Optional[str] = None,
+    version: Optional[str] = None,
+) -> Dict[str, Any]:
+    """Create a standardized FHIR Coding dict.
+
+    Mirrors the FHIR Coding structure and keeps optional fields omitted when None,
+    which matches how other helpers in the codebase behave.
+    """
+    coding: Dict[str, Any] = {
+        "system": system,
+        "code": code,
+    }
+    if display is not None:
+        coding["display"] = display
+    if version is not None:
+        coding["version"] = version
+    return coding
+
+

healthchain/data_generators/patientgenerators.py

@@ -15,6 +15,7 @@
 from fhir.resources.period import Period
 from fhir.resources.codeableconcept import CodeableConcept
 from fhir.resources.coding import Coding
+from healthchain.data_generators.coding_utils import create_coding
 from fhir.resources.patient import Patient
 
 
@@ -81,7 +82,7 @@ def generate():
         marital_code = faker.random_element(elements=(marital_status_dict.keys()))
         return CodeableConcept(
             coding=[
-                Coding(
+                create_coding(
                     system="http://terminology.hl7.org/CodeSystem/v3-MaritalStatus",
                     code=marital_code,
                     display=marital_status_dict.get(marital_code),

healthchain/data_generators/practitionergenerators.py

@@ -14,6 +14,7 @@
 )
 from fhir.resources.codeableconcept import CodeableConcept
 from fhir.resources.coding import Coding
+from healthchain.data_generators.coding_utils import create_coding
 
 
 faker = Faker()
@@ -37,7 +38,7 @@ def generate():
         )
         return CodeableConcept(
             coding=[
-                Coding(
+                create_coding(
                     system="http://example.org",
                     code=random_qual,
                     display=QualificationGenerator.qualification_dict.get(random_qual),
@@ -79,7 +80,7 @@ def generate():
         language = faker.random_element(elements=language_value_dict.keys())
         return CodeableConcept(
             coding=[
-                Coding(
+                create_coding(
                     system="http://terminology.hl7.org/CodeSystem/languages",
                     code=language,
                     display=language_value_dict.get(language),