some model name changing, and constains model improvement

app/main.py

@@ -36,4 +36,4 @@ async def solve(solver_run: SolverRun):
       items=[item.id for item in solver_run.items]
     )]
   )
-  return response
+  return solver_run

app/models/constraint.py

@@ -1,10 +1,9 @@
 from pydantic import BaseModel
 from typing import Optional
 
+from models.attribute import Attribute
+
 class Constraint(BaseModel):
-  key: str
-  value: str
-  field_id: Optional[int]
-  option_id: Optional[int]
+  reference_attribute: Attribute
   minimum: int
   maximum: int

app/models/item.py

@@ -1,8 +1,8 @@
 from pydantic import BaseModel
 from typing import List
 
-from models.metadata import MetaData
+from models.attribute import Attribute
 
 class Item(BaseModel):
   id: int
-  metadata: List[MetaData]
+  attribute: List[Attribute]

app/models/metadata.py

@@ -1,8 +0,0 @@
-from pydantic import BaseModel
-from typing import Optional
-
-class MetaData(BaseModel):
-  key: str
-  value: str
-  field_id: Optional[int]
-  option_id: Optional[int]

app/models/objective_function.py

@@ -9,4 +9,5 @@ class ObjectiveFunction(BaseModel):
   # likely with models representing each objective function type
   tif_targets: List[Target]
   tcc_targets: List[Target]
+  objective: "minimize"
   weight: Dict = {'tif': 1, 'tcc': 1}

app/models/solver_run.py

@@ -8,11 +8,10 @@ from models.objective_function import ObjectiveFunction
 from models.advanced_options import AdvancedOptions
 
 class SolverRun(BaseModel):
-  token: str
   items: List[Item]
   constraints: List[Constraint]
   irt_model: IRTModel
   objective_fuction: ObjectiveFunction
   total_form_items: int
-  advanced_options: Optional[List[AdvancedOptions]]
+  advanced_options: Optional[AdvancedOptions]
   engine: str