[英]How to apply find_by to elements of an array of arrays - Rails
I have the following array of arrays of user_ids
:我有以下
user_ids
数组:
@host_and_guest = [
["1299d9c9-e5c9-4e49-b0ff-b986c415eee8", "346b5c2f-a459-4c4f-8193-e0928c86c66c"],
["1299d9c9-e5c9-4e49-b0ff-b986c415eee8", "346b5c2f-a459-4c4f-8193-e0928c86c66c"],
["1299d9c9-e5c9-4e49-b0ff-b986c415eee8", "346b5c2f-a459-4c4f-8193-e0928c86c66c"],
["1299d9c9-e5c9-4e49-b0ff-b986c415eee8", "1299d9c9-e5c9-4e49-b0ff-b986c415eee8"]
]
and I would like to apply User.find_by(id: XXXX).pluck(:longitude, :latitude,:city)
to each of the user_id
in order to create a another array of longitude, latitude, and city for each of the sub-array.我想将
User.find_by(id: XXXX).pluck(:longitude, :latitude,:city)
应用于每个user_id
,以便为每个子项创建另一个经度、纬度和城市数组-大批。
Is there an efficient way to do so please ?有没有一种有效的方法可以做到这一点?
users = User.where(id: @host_and_guest.flatten)
.pluck(:id, :longitude, :latitude, :city)
.group_by(&:first) # creates hash with id as keys
@host_and_guest.map do |pair|
# replace pair with array of
# [[longitude, latitude, city], [longitude, latitude, city]]
pair.map { |id| users[id]&.drop(1) }
end
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