紅寶石 - 我如何可以訪問一個變量

Question

我有此數組：

{ 
:details=> [ 
     { 
    "account"   =>"", 
    "address"   =>"", 
    "category"   =>"send", 
    "amount"   =>0.0, 
    "fee"   =>0.0 
    }, 
    { 
    "account"   =>"payment", 
    "address"   =>"SXX5kpEyF8w1oK913wVg2ZbJWpLmWnCgAU", 
    "category"   =>"receive", 
    "amount"   =>1.0 
    } 
] 
} 

我如何可以訪問紅寶石第二個「地址」元素？當我做

address: detail[:address] 

我只得到了第一個（裏面是空的）。

Answer 1

怎麼樣：

data = { 
:details=> [ 
     { 
    "account"   =>"", 
    "address"   =>"", 
    "category"   =>"send", 
    "amount"   =>0.0, 
    "fee"   =>0.0 
    }, 
    { 
    "account"   =>"payment", 
    "address"   =>"SXX5kpEyF8w1oK913wVg2ZbJWpLmWnCgAU", 
    "category"   =>"receive", 
    "amount"   =>1.0 
    } 
] 
} 

然後（因爲，你永遠不知道Array內部哈希的序列）：

data[:details].detect{|d| !d['address'].empty? }['address'] 

Answer 2

只是解決陣列

obj = { 
:details => [ 
    { 
    "account"   =>"", 
    "address"   =>"", 
    "category"  =>"send", 
    "amount"   =>0.0, 
    "fee"    =>0.0 
    }, 
    { 
    "account"   =>"payment", 
    "address"   =>"SXX5kpEyF8w1oK913wVg2ZbJWpLmWnCgAU", 
    "category"  =>"receive", 
    "amount"   =>1.0 
    } 
] 
} 

obj[:details][1]['address'] 

這裏的第二個元素是在線REPL：http://repl.it/ZZm

Answer 3

採用注射方法，你可以得到所有的人都像這樣：

[21] pry(main)> results = [] 
=> [] 
[22] pry(main)> json[:details].inject { |sum, k| results << k["address"] } 
=> [["SXX5kpEyF8w1oK913wVg2ZbJWpLmWnCgAU"]]