为nil：NilClass获取未定义的方法'click_button'（NoMethodError）

Question

用于使用水豚选择下拉列表：获取未定义的方法

[click_button' for nil:NilClass (NoMethodError) ./features/pages/cm_dash_board.rb:187:in choose_role'./features/pages/cm_dash_board.rb:147:inset_role' ./features/step_definitions/cm_dash_board_steps.rb:58:in/ ^

Method:
  def choose_role(role_name)
    click_button CHOOSE_ROLE
    find(ROLEDROPDOWN).all('li').select{|role| role.text == role_name}.first.click_button 
  end 
Feature file:And(/^I assign "([^"]*)" role to the "([^"]*)" user$/) do |email, role_name|
  @sw.cm_dash_board.set_role(email,role_name)
end

Answer 1

作为副节点，您实际上绝对不应该使用select，而应该在all调用中指定它，例如

find(ROLEDROPDOWN).find('li', exact_text: role_name).click_button

这可能仍然会失败，但是至少该错误会告诉您为什么会失败