我需要提示将四个数组转换为哈希值。
我的post params有这四个数组：
"jcrop-x"=>["0", "614", "0", "798"],
"jcrop-y"=>["0", "0", "273", "286"],
"jcrop-x2"=>["717", "666", "678", "482"],
"jcrop-y2"=>["567", "563", "529", "516"],
这是一种矩阵：每个数组的索引为0的值是我main_image的裁剪坐标。第二个值是我square_image等的裁剪坐标
我需要使用这种结构填充数组：
crop_params{
main_image: {x: 0, y: 0, x2: 717, y2: 567},
second_image: {x: 614, y: 0, x2: 666, y2: 563},
third_image: {x: 0, y: 273, x2: 678, y2: 529},
fourth_image: {x: 798, y: 286, x2: 482, y2: 516}
}
这是我的实际解决方案：
IMAGE_VERSION = [:main_news_img, :square_img, :vertical_img, :horizontal_img]
crop_params = {}
IMAGE_VERSION.each_with_index do |v,i|
crop_params[v] = {}
crop_params[v]["x"] = params['content']["jcrop-x"][i]
crop_params[v]["y"] = params['content']["jcrop-y"][i]
crop_params[v]["x2"] = params['content']["jcrop-x2"][i]
crop_params[v]["y2"] = params['content']["jcrop-y2"][i]
end
我可以用很多行代码来做到这一点。是否有任何聪明的方法可以让我的助手保持清洁和可读？
答案 0 :(得分：1)
假设您总是有4张图片，请尝试：
Hash[[:main_image, :second_image, :third_image, :fourth_image].zip params.values.transpose.map{|a| Hash[[:x, :y, :x2, :y2].zip(a)]}]
如果不是，则需要稍微修改。
答案 1 :(得分：1)
IMAGE_VERSIONS = [:main_news_img, :square_img, :vertical_img, :horizontal_img]
def map_params(params)
hashes = params.map do |key, values|
values.map do |value|
[key.split('-').last, value.to_i]
end
end.transpose.map do |key_value_pairs|
Hash[key_value_pairs]
end
Hash[IMAGE_VERSIONS.zip(hashes)]
end
pp map_params(params)
# => {:main_news_img=>{"x"=>0, "y"=>0, "x2"=>717, "y2"=>567},
# => :square_img=>{"x"=>614, "y"=>0, "x2"=>666, "y2"=>563},
# => :vertical_img=>{"x"=>0, "y"=>273, "x2"=>678, "y2"=>529},
# => :horizontal_img=>{"x"=>798, "y"=>286, "x2"=>482, "y2"=>516}}
答案 2 :(得分：1)
params = {
"content" => {
"jcrop-x"=>["0", "614", "0", "798"],
"jcrop-y"=>["0", "0", "273", "286"],
"jcrop-x2"=>["717", "666", "678", "482"],
"jcrop-y2"=>["567", "563", "529", "516"],
}
}
IMAGE_VERSION = [:main_news_img, :square_img, :vertical_img, :horizontal_img]
IMAGE_VERSION.each_with_index.with_object({}) do |image_and_index, object|
image_version, i = image_and_index
object[image_version] = Hash[params['content'].map{|key, value| [key.gsub(/^jcrop-/, ''), value[i]]}]
end
答案 3 :(得分：0)
使用压缩和映射实现您正在寻找的版本：
require 'pp'
params = {
"jcrop-x"=>["0", "614", "0", "798"],
"jcrop-y"=>["0", "0", "273", "286"],
"jcrop-x2"=>["717", "666", "678", "482"],
"jcrop-y2"=>["567", "563", "529", "516"]
}
# 1. Extract the value arrays, mapping all values to the result
# of calling .to_i on them:
in_keys = %w{jcrop-x jcrop-y jcrop-x2 jcrop-y2}
in_values = in_keys.map { |key| params[key].map(&:to_i) }
# 2. Now transpose the array of arrays:
in_values_t = in_values.transpose
# 3. Now we have an array of arrays of numbers. We want this to be
# an array of hashes instead, so we map them:
out_subkeys = %i{x y x2 y2}
out_values = in_values_t.map { |a| Hash[out_subkeys.zip(a)] }
# 4. Finally, we simply zip that array with the output keys:
out_keys = %i{main_image second_image third_image fourth_image}
crop_params = Hash[out_keys.zip(out_values)]
pp crop_params
答案 4 :(得分：0)
我会这样做：
params = {
"jcrop-x" => [ "0", "614", "0", "798"],
"jcrop-y" => [ "0", "0", "273", "286"],
"jcrop-x2" => ["717", "666", "678", "482"],
"jcrop-y2" => ["567", "563", "529", "516"],
}
IMAGE_VERSIONS = [:main_news_img, :square_img, :vertical_img, :horizontal_img]
def map_params(params)
v = params.map { |key, values| [key.split('-').last, values]}
# [["x", [ "0", "614", "0", "798"]],["y" ,[ "0", "0", "273", "286"]],
# ["x2",["717", "666", "678", "482"]],["y2",["567", "563", "529", "516"]]]
keys, values = [v.map(&:first).map(&:to_sym), v.map(&:last).transpose]
# keys => [:x, :y, :x2, :y2]
# values => [["0", "0", "717", "567"], ["614", "0", "666", "563"],
# ["0", "273", "678", "529"], ["798", "286", "482", "516"]]
IMAGE_VERSIONS.each_with_object({}) {|k,h| h[k]=Hash[keys.zip(values.shift)]}
end
# { :main_news_img => {:x=> "0", :y=> "0", :x2=>"717", :y2=>"567"},
# :square_img => {:x=>"614", :y=> "0", :x2=>"666", :y2=>"563"},
# :vertical_img => {:x=> "0", :y=>"273", :x2=>"678", :y2=>"529"},
# :horizontal_img => {:x=>"798", :y=>"286", :x2=>"482", :y2=>"516"} }
如果无法从数据中确定键:x, :y, :x2, :y2，请添加
KEYS = [:x, :y, :x2, :y2]
并将方法简化为：
def map_params(params)
values = params.map { |_, values| values }.transpose
# [["0", "0", "717", "567"], ["614", "0", "666", "563"],
# ["0", "273", "678", "529"], ["798", "286", "482", "516"]]
IMAGE_VERSIONS.each_with_object({}) {|k,h|h[k]=Hash[KEYS.zip(values.shift)]}
end
答案 5 :(得分：0)
从一组传入的参数开始，例如：
params = {
"jcrop-x" => ["0", "614", "0", "798"],
"jcrop-y" => ["0", "0", "273", "286"],
"jcrop-x2" => ["717", "666", "678", "482"],
"jcrop-y2" => ["567", "563", "529", "516"],
}
我会用：
transposed_params_values = params.values.transpose
crop_params = Hash[
*[:main_image, :second_image, :third_image, :fourth_image].flat_map { |k|
[
k,
Hash[
[:x, :y, :x2, :y2].zip(transposed_params_values.shift)
]
]
}
]
# => {:main_image=>{:x=>"0", :y=>"0", :x2=>"717", :y2=>"567"}, :second_image=>{:x=>"614", :y=>"0", :x2=>"666", :y2=>"563"}, :third_image=>{:x=>"0", :y=>"273", :x2=>"678", :y2=>"529"}, :fourth_image=>{:x=>"798", :y=>"286", :x2=>"482", :y2=>"516"}}
或者，写得更紧凑：
transposed_params_values = params.values.transpose
crop_params = Hash[
*[:main_image, :second_image, :third_image, :fourth_image].flat_map { |k|
[k, Hash[ [:x, :y, :x2, :y2].zip(transposed_params_values.shift) ]]
}
]
# => {:main_image=>{:x=>"0", :y=>"0", :x2=>"717", :y2=>"567"}, :second_image=>{:x=>"614", :y=>"0", :x2=>"666", :y2=>"563"}, :third_image=>{:x=>"0", :y=>"273", :x2=>"678", :y2=>"529"}, :fourth_image=>{:x=>"798", :y=>"286", :x2=>"482", :y2=>"516"}}
以下是发生情况的细分：
transposed_params_values = params.values.transpose
# => [["0", "0", "717", "567"], ["614", "0", "666", "563"], ["0", "273", "678", "529"], ["798", "286", "482", "516"]]
Hash[[:x, :y, :x2, :y2].zip(transposed_params_values.first)]
# => {:x=>"0", :y=>"0", :x2=>"717", :y2=>"567"}