fix(mongodb): support numeric contains filters

apps/desktop/src/lib/__tests__/app/documentStoreProvider.filter.spec.ts

@@ -33,6 +33,46 @@ describe("document store structured filters", () => {
     expect(() => buildDocumentFilterCondition({ ...baseRule, rawValue: "not-a-number", valueType: "number" }, { kind: "mongodb" })).toThrow("Invalid MongoDB number filter value");
   });
 
+  it("matches numeric MongoDB fields by their string representation", () => {
+    expect(buildDocumentFilterCondition({ id: "contains", fieldName: "age", mode: "like", rawValue: "2", conjunction: "AND" }, { kind: "mongodb", sampleValue: 28 })).toEqual({
+      $expr: {
+        $regexMatch: {
+          input: { $convert: { input: "$age", to: "string", onError: "", onNull: "" } },
+          regex: "2",
+          options: "i",
+        },
+      },
+    });
+    expect(buildDocumentFilterCondition({ id: "contains", fieldName: "age", mode: "like", rawValue: "2", valueType: "number", conjunction: "AND" }, { kind: "mongodb" })).toEqual({
+      $expr: {
+        $regexMatch: {
+          input: { $convert: { input: "$age", to: "string", onError: "", onNull: "" } },
+          regex: "2",
+          options: "i",
+        },
+      },
+    });
+    expect(buildDocumentFilterCondition({ id: "not-contains", fieldName: "age", mode: "not-like", rawValue: "2", valueType: "number", conjunction: "AND" }, { kind: "mongodb" })).toEqual({
+      $expr: {
+        $not: [
+          {
+            $regexMatch: {
+              input: { $convert: { input: "$age", to: "string", onError: "", onNull: "" } },
+              regex: "2",
+              options: "i",
+            },
+          },
+        ],
+      },
+    });
+  });
+
+  it("keeps MongoDB string contains filters on the field regex path", () => {
+    expect(buildDocumentFilterCondition({ id: "contains", fieldName: "name", mode: "like", rawValue: "张", conjunction: "AND" }, { kind: "mongodb", sampleValue: "张三" })).toEqual({
+      name: { $regex: "张", $options: "i" },
+    });
+  });
+
   it("keeps the MongoDB _id sample for automatic type inference", () => {
     const tree = documentFieldPathTreeFromDocuments([{ _id: "001", name: "Alice" }]);
 

apps/desktop/src/lib/app/documentStoreProvider.ts

@@ -501,9 +501,15 @@ export function buildDocumentFilterCondition(rule: DocumentFilterRule, options:
       return { [rule.fieldName]: { $ne: value } };
     case "like":
       if (options.kind === "dynamodb") return { [rule.fieldName]: { $contains: value } };
+      if (options.kind === "mongodb" && mongoFilterValueIsNumeric(rule.valueType, options.sampleValue)) {
+        return mongoNumericContainsCondition(rule.fieldName, textValue);
+      }
       return { [rule.fieldName]: { $regex: escapeRegexLiteral(textValue), $options: "i" } };
     case "not-like":
       if (options.kind === "dynamodb") return { [rule.fieldName]: { $notContains: value } };
+      if (options.kind === "mongodb" && mongoFilterValueIsNumeric(rule.valueType, options.sampleValue)) {
+        return mongoNumericContainsCondition(rule.fieldName, textValue, true);
+      }
       return { [rule.fieldName]: { $not: { $regex: escapeRegexLiteral(textValue), $options: "i" } } };
     case "greater-than":
       return { [rule.fieldName]: { $gt: value } };
@@ -524,6 +530,19 @@ function escapeRegexLiteral(value: string): string {
   return value.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
 }
 
+function mongoFilterValueIsNumeric(valueType?: DocumentFilterValueType, sampleValue?: unknown): boolean {
+  if (valueType === "number" || valueType === "int32" || valueType === "int64" || valueType === "decimal128") return true;
+  if (typeof sampleValue === "number") return true;
+  if (!isPlainRecord(sampleValue)) return false;
+  const keys = Object.keys(sampleValue);
+  return keys.length === 1 && ["$numberInt", "$numberLong", "$numberDouble", "$numberDecimal"].includes(keys[0]);
+}
+
+function mongoNumericContainsCondition(fieldName: string, textValue: string, negate = false): Record<string, unknown> {
+  const regexMatch = { $regexMatch: { input: { $convert: { input: `$${fieldName}`, to: "string", onError: "", onNull: "" } }, regex: escapeRegexLiteral(textValue), options: "i" } };
+  return negate ? { $expr: { $not: [regexMatch] } } : { $expr: regexMatch };
+}
+
 export function combineDocumentFilterConditions(conditions: Record<string, unknown>[], rules: Pick<DocumentFilterRule, "conjunction">[], arrayObjectParents: Array<string | null> = []): Record<string, unknown> | null {
   if (conditions.length === 0) return null;
   const grouped = groupLeadingArrayObjectConditions(conditions, rules, arrayObjectParents);