ruby-on-rails - rails 中是否有类似于 in_groups_of 的方法但用于哈希？

Question

我想将这个散列分成大小组，假设每组 2 个项目

hash = {'mail1@email.com': {name: 'name 1'},
        'mail2@email.com': {name: 'name 2'},
        'mail3@email.com': {name: 'name 3'},
        'mail4@email.com': {name: 'name 4'},
        'mail5@email.com': {name: 'name 5'}
       }

想要的结果应该是:

hash1 = {'mail1@email.com': {name: 'name 1'},
        'mail2@email.com': {name: 'name 2'}}

hash2 = {'mail3@email.com': {name: 'name 3'},
        'mail4@email.com': {name: 'name 4'}}

hash3 = {'mail5@email.com': {name: 'name 5'}}

Answer 1

您可以使用 Enumerable#each_slice ，之后将每个元素映射为 Array#to_h 的哈希值:

hash1, hash2, hash3 = hash.each_slice(2).map(&:to_h)
p hash1 # {:"mail1@email.com"=>{:name=>"name 1"}, :"mail2@email.com"=>{:name=>"name 2"}}
p hash2 # {:"mail3@email.com"=>{:name=>"name 3"}, :"mail4@email.com"=>{:name=>"name 4"}}
p hash3 # {:"mail5@email.com"=>{:name=>"name 5"}}