谷粒商城--调式会员等级接口获取分类关联品牌

没错又是stream对集合的操作！

/**
 * 1.获取分类关联的品牌
 * /product/categorybrandrelation/brands/list
 */
@GetMapping("/brands/list")
public R relationBrandList(@RequestParam(value = "catId", required = true) Long catId) {
    List<BrandEntity> vos = categoryBrandRelationService.getBrandsByCatId(catId);
    List<BrandVo> collect = vos.stream().map(item -> {
        BrandVo brandVo = new BrandVo();
        brandVo.setBrandId(item.getBrandId());
        brandVo.setBrandName(item.getName());
        return brandVo;
    }).collect(Collectors.toList());
    return R.ok().put("data",collect);
}

@Override
public List<BrandEntity> getBrandsByCatId(Long catId) {
    //获得CategoryBrandRelationEntity集合对象
    List<CategoryBrandRelationEntity> catelogId = relationDao.selectList(new QueryWrapper<CategoryBrandRelationEntity>().eq("catelog_id", catId));
    //获得所有集合对象中brandid，通过brandService查询所有品牌，封装成品牌对象集合
    List<BrandEntity> collect = catelogId.stream().map(item -> {
        Long brandId = item.getBrandId();
        BrandEntity entity = brandService.getById(brandId);
        return entity;
    }).collect(Collectors.toList());
    //返回品牌对象集合
    return collect;
}