Rails控制台与MySQL结果不同

Question

I am having trouble using a LEFT OUTER JOIN with Rails. I think I have my Ruby code down but when I enter it into the rails console I get one result and when I copy the produced MySQL I get another result. An entire column (value) is missing in the rails console . Why is it that the SQL is the exact same but I am getting different results? Ideally, I want the results to include the value column. As always any help would be greatly appreciated.

Rails Console Response

2.0.0-p353 :023 > SecurityItem.joins("LEFT OUTER JOIN  security_role_permissions ON security_role_permissions.security_item_id = security_items.id  AND security_role_permissions.role_id ='1'").select("security_items.name, security_role_permissions.value")

 SecurityItem Load (0.7ms)  SELECT security_items.name, security_role_permissions.value FROM `security_items` LEFT OUTER JOIN security_role_permissions ON security_role_permissions.security_item_id = security_items.id AND security_role_permissions.role_id ='1

=> #<ActiveRecord::Relation 
[#<SecurityItem id: nil, key: "ChangePassword", name: "Change Password">, 
 #<SecurityItem id: nil, key: "AddUsers", name: "Add Users">, 
 #<SecurityItem id: nil, key: "UpdateUsers", name: "Update Users">, 
 #<SecurityItem id: nil, key: "DeleteUsers", name: "Delete Users">]> 

MySQL Response

mysql>  SELECT security_items.name, security_role_permissions.value FROM `security_items` LEFT OUTER JOIN security_role_permissions ON security_role_permissions.security_item_id = security_items.id AND security_role_permissions.role_id ='1';

+-----------------+-------+
| name            | value |
+-----------------+-------+ 
| Change Password |     1 |
| Add Users       |  NULL |
| Update Users    |  NULL |
| Delete Users    |  NULL |
+-----------------+-------+

Answer 1

Only the attributes from the SecurityItem class appear in the return result. However, you can access the attributes from the joined table through the 'attributes' method.

security_items = SecurityItem.joins("LEFT OUTER JOIN  security_role_permissions 
ON security_role_permissions.key = security_items.key  AND
security_role_permissions.role_id ='1'").select("security_items.name, 
security_items.key, security_role_permissions.permission")

security_items.each { |security_item| puts security_item.attributes['permission'] }