Rails：验证中的多个 if 条件
使用：Rails 3.0.3
我有这样的验证：
validates_numericality_of :person_weight_kg, :greater_than => 0, :message => "value_must_be_number_over_zero", :if => :bmi_calculation?, :if => :is_metric?
我想验证多个 if 条件（例如示例中）。但是，Rails 似乎将这些语句视为 OR。一个返回 false，一个返回 true，这使得验证通过。
那么，如何检查此验证是否满足两个 if 语句（bmi_calculation 和 is_metric）？
Using: Rails 3.0.3
I have validations such as this one:
validates_numericality_of :person_weight_kg, :greater_than => 0, :message => "value_must_be_number_over_zero", :if => :bmi_calculation?, :if => :is_metric?
That I would like to validate for multiple if-conditions (such as in the example). But it seems, however, that Rails treats these statements as OR. One returns false and one returns true which makes the validation go through.
So, how do I check that this validation fulfills BOTH if-statements (bmi_calculation AND is_metric)?
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使用 lambda 作为
if条件：Use a lambda as the
ifcondition: