Ruby/Rails:合并地图的结果

Question

我有@products收集,我想合并image_ids到单个数组.这是输出@products.map(&:image_ids):

@products.map(&:image_ids)
=> [[1654, 1655, 1656],
 [1649, 1650, 1652, 1653],
 [1625],
 [1624],
 [1623],
 [1622],
 [1621],
 [1620],
 [1619],
 [1618]]

Answer 1

使用以下操作flat_map:

@products.flat_map(&:image_ids)