JSJP_Student/jiaPei/Modules/BaseModule/BaseClass/ViewModel/RQCollectionViewModel.m

//
//  RQCollectionViewModel.m
//  YueXueChe
//
//  Created by 张嵘 on 2018/12/18.
//  Copyright © 2018 lee. All rights reserved.
//

#import "RQCollectionViewModel.h"

@interface RQCollectionViewModel ()
/// request remote data cmd
@property (nonatomic, readwrite, strong) RACCommand *requestRemoteDataCommand;
@end

@implementation RQCollectionViewModel
- (void)initialize {
	[super initialize];
	
	self.page = 1;
	self.perPage = 20;
	
	/// request remote data
	@weakify(self)
	self.requestRemoteDataCommand = [[RACCommand alloc] initWithSignalBlock:^(NSNumber *page) {
		@strongify(self)
		return [[self requestRemoteDataSignalWithPage:page.unsignedIntegerValue] takeUntil:self.rac_willDeallocSignal];
	}];
	
	/// 过滤错误信息
	[[self.requestRemoteDataCommand.errors
	  filter:[self requestRemoteDataErrorsFilter]]
	 subscribe:self.errors];
}

/// sub class can ovrride it
- (BOOL (^)(NSError *error))requestRemoteDataErrorsFilter {
	return ^(NSError *error) {
		return YES;
	};
}

- (id)fetchLocalData {
	return nil;
}

- (NSUInteger)offsetForPage:(NSUInteger)page {
	return (page - 1) * self.perPage;
}


- (RACSignal *)requestRemoteDataSignalWithPage:(NSUInteger)page {
	return [RACSignal empty];
}

@end