Ruby on rails 获取仅匹配两个元素的对象数组的唯一元素

我有一个对象数组，例如：

[#<Something id: 34175, name: "abc", value: 123.3, comment: "something here">,
 #<Something id: 34176, name: "xyz", value: 123.3, comment: "something here">,
 #<Something id: 34177, name: "xyz", value: 227.3, comment: "something here sdfg">,
 #<Something id: 34178, name: "xyz", value: 123.3, comment: "something here sdfg">]

[#，
#,
#,
#]

我想返回所有不具有相同名称和值的元素。因此，在这种情况下，回报将是：

[#<Something id: 34175, name: "abc", value: 123.3, comment: "something here">,
 #<Something id: 34176, name: "xyz", value: 123.3, comment: "something here">,
 #<Something id: 34177, name: "xyz", value: 227.3, comment: "something here sdfg">]

[#，
#,
#]

我只关心名字和价值

---

我尝试将一个块传递给

uniq

方法，但我不知道如何通过两个元素而不仅仅是一个元素进行匹配。

您想使用以块为单位的形式

代码

arr.uniq { |instance| [instance.name, instance.value] }

class Something
  attr_accessor :id, :name, :value, :comment
  def initialize(id, name, value, comment)
    @id = id
    @name = name
    @value = value
    @comment = comment
  end
end

arr = [Something.new(34175, "abc", 123.3, "something here"),
       Something.new(34176, "xyz", 123.3, "something here"),
       Something.new(34177, "xyz", 227.3, "something here sdfg"),
       Something.new(34178, "xyz", 123.3, "something here sdfg")]
  #=> [#<Something:0x000001012cc2f0 @id=34175, @name="abc", @value=123.3,
  #      @comment="something here">,
  #    #<Something:0x000001012cc278 @id=34176, @name="xyz", @value=123.3,
  #      @comment="something here">,
  #    #<Something:0x000001012cc200 @id=34177, @name="xyz", @value=227.3,
  #      @comment="something here sdfg">,
  #    #<Something:0x000001012cc0e8 @id=34178, @name="xyz", @value=123.3,
  #      @comment="something here sdfg">]

arr.uniq { |instance| [instance.name, instance.value] }

  #=> [#<Something:0x000001012cc2f0 @id=34175, @name="abc", @value=123.3,
  #      @comment="something here">,
  #    #<Something:0x000001012cc278 @id=34176, @name="xyz", @value=123.3,
  #      @comment="something here">,
  #    #<Something:0x000001012cc200 @id=34177, @name="xyz", @value=227.3,
  #      @comment="something here sdfg">]

示例

arr.uniq { |instance| [instance.name, instance.value] }

class Something
  attr_accessor :id, :name, :value, :comment
  def initialize(id, name, value, comment)
    @id = id
    @name = name
    @value = value
    @comment = comment
  end
end

arr = [Something.new(34175, "abc", 123.3, "something here"),
       Something.new(34176, "xyz", 123.3, "something here"),
       Something.new(34177, "xyz", 227.3, "something here sdfg"),
       Something.new(34178, "xyz", 123.3, "something here sdfg")]
  #=> [#<Something:0x000001012cc2f0 @id=34175, @name="abc", @value=123.3,
  #      @comment="something here">,
  #    #<Something:0x000001012cc278 @id=34176, @name="xyz", @value=123.3,
  #      @comment="something here">,
  #    #<Something:0x000001012cc200 @id=34177, @name="xyz", @value=227.3,
  #      @comment="something here sdfg">,
  #    #<Something:0x000001012cc0e8 @id=34178, @name="xyz", @value=123.3,
  #      @comment="something here sdfg">]

arr.uniq { |instance| [instance.name, instance.value] }

  #=> [#<Something:0x000001012cc2f0 @id=34175, @name="abc", @value=123.3,
  #      @comment="something here">,
  #    #<Something:0x000001012cc278 @id=34176, @name="xyz", @value=123.3,
  #      @comment="something here">,
  #    #<Something:0x000001012cc200 @id=34177, @name="xyz", @value=227.3,
  #      @comment="something here sdfg">]

分类
属性访问器：id，：name，：value，：comment
def初始化（id、名称、值、注释）
@id=id
@name=name
@价值=价值
@注释=注释
结束
结束
arr=[Something.new（34175，“abc”，123.3，“Something here”），
新的东西（34176，“xyz”，123.3，“这里的东西”），
新的东西（34177，“xyz”，227.3，“这里的东西sdfg”），
新的东西（34178，“xyz”，123.3，“这里的东西sdfg”）]
#=> [#,
#    #,
#    #,
#    #]
arr.uniq{| instance |[instance.name，instance.value]}
#=> [#,
#    #,
#    #]

您希望使用以块为单位的形式

代码

arr.uniq { |instance| [instance.name, instance.value] }

class Something
  attr_accessor :id, :name, :value, :comment
  def initialize(id, name, value, comment)
    @id = id
    @name = name
    @value = value
    @comment = comment
  end
end

arr = [Something.new(34175, "abc", 123.3, "something here"),
       Something.new(34176, "xyz", 123.3, "something here"),
       Something.new(34177, "xyz", 227.3, "something here sdfg"),
       Something.new(34178, "xyz", 123.3, "something here sdfg")]
  #=> [#<Something:0x000001012cc2f0 @id=34175, @name="abc", @value=123.3,
  #      @comment="something here">,
  #    #<Something:0x000001012cc278 @id=34176, @name="xyz", @value=123.3,
  #      @comment="something here">,
  #    #<Something:0x000001012cc200 @id=34177, @name="xyz", @value=227.3,
  #      @comment="something here sdfg">,
  #    #<Something:0x000001012cc0e8 @id=34178, @name="xyz", @value=123.3,
  #      @comment="something here sdfg">]

arr.uniq { |instance| [instance.name, instance.value] }

  #=> [#<Something:0x000001012cc2f0 @id=34175, @name="abc", @value=123.3,
  #      @comment="something here">,
  #    #<Something:0x000001012cc278 @id=34176, @name="xyz", @value=123.3,
  #      @comment="something here">,
  #    #<Something:0x000001012cc200 @id=34177, @name="xyz", @value=227.3,
  #      @comment="something here sdfg">]

示例

arr.uniq { |instance| [instance.name, instance.value] }

class Something
  attr_accessor :id, :name, :value, :comment
  def initialize(id, name, value, comment)
    @id = id
    @name = name
    @value = value
    @comment = comment
  end
end

arr = [Something.new(34175, "abc", 123.3, "something here"),
       Something.new(34176, "xyz", 123.3, "something here"),
       Something.new(34177, "xyz", 227.3, "something here sdfg"),
       Something.new(34178, "xyz", 123.3, "something here sdfg")]
  #=> [#<Something:0x000001012cc2f0 @id=34175, @name="abc", @value=123.3,
  #      @comment="something here">,
  #    #<Something:0x000001012cc278 @id=34176, @name="xyz", @value=123.3,
  #      @comment="something here">,
  #    #<Something:0x000001012cc200 @id=34177, @name="xyz", @value=227.3,
  #      @comment="something here sdfg">,
  #    #<Something:0x000001012cc0e8 @id=34178, @name="xyz", @value=123.3,
  #      @comment="something here sdfg">]

arr.uniq { |instance| [instance.name, instance.value] }

  #=> [#<Something:0x000001012cc2f0 @id=34175, @name="abc", @value=123.3,
  #      @comment="something here">,
  #    #<Something:0x000001012cc278 @id=34176, @name="xyz", @value=123.3,
  #      @comment="something here">,
  #    #<Something:0x000001012cc200 @id=34177, @name="xyz", @value=227.3,
  #      @comment="something here sdfg">]

分类
属性访问器：id，：name，：value，：comment
def初始化（id、名称、值、注释）
@id=id
@name=name
@价值=价值
@注释=注释
结束
结束
arr=[Something.new（34175，“abc”，123.3，“Something here”），
新的东西（34176，“xyz”，123.3，“这里的东西”），
新的东西（34177，“xyz”，227.3，“这里的东西sdfg”），
新的东西（34178，“xyz”，123.3，“这里的东西sdfg”）]
#=> [#,
#    #,
#    #,
#    #]
arr.uniq{| instance |[instance.name，instance.value]}
#=> [#,
#    #,
#    #]

这应该可以做到：

a.uniq{| instance |[instance.name，instance.value]}

@CarySwoveland作为answer@CarySwoveland成功了！谢谢你的帮助。发布作为答案，我会接受。这应该可以做到：

a.uniq{| instance |[instance.name，instance.value]}

@CarySwoveland发布作为答案answer@CarySwoveland成功了！谢谢你的帮助。作为答案发布，我将接受。