feat: added where method to fetch assets

Author: reeshika-h

Contentstack/AssetLibrary.h

@@ -230,6 +230,24 @@ typedef NS_ENUM(NSUInteger, OrderBy) {
  */
 
 - (void)fetchAll:(void (^) (ResponseType type,NSArray<Asset *> * BUILT_NULLABLE_P result,NSError * BUILT_NULLABLE_P error))completionBlock;
+
+/**
+ This method fetches assets using other fields than UID..
+ 
+      //Obj-C
+      [assetLib where:(NSString *)field equalTo:(NSObject *)value];
+ 
+      //Swift
+      assetLib.where("fieldName","value");
+ 
+ This allows filtering assets by specifying the field name and the value to match.
+ @param field The name of the field to filter by.
+ @param value The value that the field should match.
+ */
+- (void)where:(NSString *)field equalTo:(NSObject *)value ;
+
+- (NSDictionary*)getPostParamDictionary;
+
 @end
 
 BUILT_ASSUME_NONNULL_END

Contentstack/AssetLibrary.m

@@ -156,6 +156,25 @@ - (void)cancelRequest {
         [self.requestOperation cancel];
     }
 }
+// MARK: - Where Query -
+- (NSDictionary*) getPostParamDictionary {
+    return [self.postParamDictionary copy];
+}
+
+- (void)where:(NSString *)field equalTo:(NSObject *)value {
+    if (field.length == 0 || !value) {
+        NSLog(@"Field or value cannot be empty");
+        return;
+    }
+    NSMutableDictionary *queryDict = [NSMutableDictionary dictionary];
+    NSDictionary *existingQuery = self.postParamDictionary[@"query"];
+    // If an existing query exists, merge it
+    if (existingQuery) {
+        [queryDict addEntriesFromDictionary:existingQuery];
+    }
+    queryDict[field] = value;
+    [self.postParamDictionary setObject:queryDict forKey:@"query"];
+}
 
 
 @end