我向模型$totalmin = null;
while($row = mysql_fetch_array($result)) {
if (is_null($totalmin) || $row['totalmin'] < $totalmin) {
$totalmin = $row['totalmin'];
}
echo "<tr>";
echo "<td><center>" . $totalmin . "</center></td>";
echo "</tr>";
}
添加了一个属性我已经运行了迁移并确认它在数据库中。错误发生在控制器中。
仅当我在表单中输入值时，才会抛出错误：:roleid
它突出显示了创建操作中的行uninitialized constant User::Roleid：
@user = User.new(user_params)定义如下：
user_params如您所见，params.require(:user).permit(:id, :email, :encrypted_password, :fname, :lname, :roleid)
存在：
roleid完整的错误文字是：
mysql> DESCRIBE users;
+------------------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+------------------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| email | varchar(255) | NO | UNI | | |
| encrypted_password | varchar(255) | NO | | | |
| reset_password_token | varchar(255) | YES | UNI | NULL | |
| reset_password_sent_at | datetime | YES | | NULL | |
| remember_created_at | datetime | YES | | NULL | |
| sign_in_count | int(11) | NO | | 0 | |
| current_sign_in_at | datetime | YES | | NULL | |
| last_sign_in_at | datetime | YES | | NULL | |
| current_sign_in_ip | varchar(255) | YES | | NULL | |
| last_sign_in_ip | varchar(255) | YES | | NULL | |
| created_at | datetime | NO | | NULL | |
| updated_at | datetime | NO | | NULL | |
| fname | varchar(255) | YES | | NULL | |
| lname | varchar(255) | YES | | NULL | |
| roleid | int(11) | YES | | NULL | |
+------------------------+--------------+------+-----+---------+----------------+
控制器代码如下所示：
Started POST "/users" for ::1 at 2016-03-17 17:23:31 -0400
Processing by UsersController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"48xz8D0jngCGOnL7qn4A93X2qeOcmvcE8QjXah7cjsxusA7FrPK8JhmVjRNa2nflkg4qfLs5cnL2oL9cHn/iUQ==", "user"=>{"id"=>"4", "email"=>"wlrg", "encrypted_password"=>"[FILTERED]", "fname"=>"flh", "lname"=>"wflh", "roleid"=>"4"}, "commit"=>"Create User"}
Completed 500 Internal Server Error in 5ms (ActiveRecord: 0.0ms)
NameError (uninitialized constant User::Roleid):
app/controllers/users_controller.rb:27:in `create'