params = ActionController::Parameters.new({
person: {
name: "Francesco",
age: 22,
role: "admin"
}
})
permitted = params.require(:person).permit(:name, :age)
permitted # => <ActionController::Parameters {"name"=>"Francesco", "age"=>22} permitted: true>
permitted.permitted? # => true
Person.first.update!(permitted)
# => #<Person id: 1, name: "Francesco", age: 22, role: "user">
您可以获取ActionController::Parameters的值,使用:key或者”key”。
params = ActionController::Parameters.new(key: "value")
params[:key] # => "value"
params["key"] # => "value"
所以params是对象,可以是数组对象,也可以是散列对象,再或者集合。
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