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from abc import ABC
from typing import Any, Dict, Mapping, Union
from beanie.odm.operators.find import BaseFindOperator
class BaseFindLogicalOperator(BaseFindOperator, ABC): ...
class LogicalOperatorForListOfExpressions(BaseFindLogicalOperator):
# todo: handle query return typing
operator: str = ""
def __init__(
self,
*expressions: Union[
BaseFindOperator, Dict[str, Any], Mapping[str, Any], bool
],
):
self.expressions = list(expressions)
@property
def query(self):
if not self.expressions:
raise AttributeError("At least one expression must be provided")
if len(self.expressions) == 1:
return self.expressions[0]
return {self.operator: self.expressions}
class Or(LogicalOperatorForListOfExpressions):
"""
`$or` query operator
Example:
```python
class Product(Document):
price: float
category: str
Or(Product.price<10, Product.category=="Sweets")
```
Will return query object like
```python
{"$or": [{"price": {"$lt": 10}}, {"category": "Sweets"}]}
```
MongoDB doc:
<https://docs.mongodb.com/manual/reference/operator/query/or/>
"""
operator = "$or"
class And(LogicalOperatorForListOfExpressions):
"""
`$and` query operator
Example:
```python
class Product(Document):
price: float
category: str
And(Product.price<10, Product.category=="Sweets")
```
Will return query object like
```python
{"$and": [{"price": {"$lt": 10}}, {"category": "Sweets"}]}
```
MongoDB doc:
<https://docs.mongodb.com/manual/reference/operator/query/and/>
"""
operator = "$and"
class Nor(BaseFindLogicalOperator):
"""
`$nor` query operator
Example:
```python
class Product(Document):
price: float
category: str
Nor(Product.price<10, Product.category=="Sweets")
```
Will return query object like
```python
{"$nor": [{"price": {"$lt": 10}}, {"category": "Sweets"}]}
```
MongoDB doc:
<https://docs.mongodb.com/manual/reference/operator/query/nor/>
"""
def __init__(
self,
*expressions: Union[
BaseFindOperator, Dict[str, Any], Mapping[str, Any], bool
],
):
self.expressions = list(expressions)
@property
def query(self):
return {"$nor": self.expressions}
class Not(BaseFindLogicalOperator):
"""
`$not` query operator
Example:
```python
class Product(Document):
price: float
category: str
Not(Product.price<10)
```
Will return query object like
```python
{"$not": {"price": {"$lt": 10}}}
```
MongoDB doc:
<https://docs.mongodb.com/manual/reference/operator/query/not/>
"""
def __init__(self, expression: Mapping[str, Any]):
self.expression = expression
@property
def query(self):
if len(self.expression) == 1:
expression_key = list(self.expression.keys())[0]
if expression_key.startswith("$"):
raise AttributeError(
"Not operator can not be used with operators"
)
value = self.expression[expression_key]
if isinstance(value, dict):
internal_key = list(value.keys())[0]
if internal_key.startswith("$"):
return {expression_key: {"$not": value}}
return {expression_key: {"$not": {"$eq": value}}}
raise AttributeError(
"Not operator can only be used with one expression"
)
|
