I did an "eager loading" SQL request that retrieve all foreign columns using a given "postedBy" foreign key :
SELECT `t`.`id` AS `t0_c0`, `t`.`sectionId` AS `t0_c1`,
`t`.`postedBy` AS `t0_c2`, `t`.`created` AS `t0_c3`, `t`.`replyCount` AS
`t0_c4`, `t`.`viewCount` AS `t0_c5`, `t`.`closed` AS `t0_c6`, `t`.`sticky`
AS `t0_c7`, `t`.`hasPoll` AS `t0_c8`, `t`.`isActive` AS `t0_c9`,
`t`.`accessLevel` AS `t0_c10`, `post`.`id` AS `t1_c0`, `post`.`topicId` AS
`t1_c1`, `post`.`sectionId` AS `t1_c2`, `post`.`title` AS `t1_c3`,
`post`.`shortContent` AS `t1_c4`, `post`.`content` AS `t1_c5`,
`post`.`postTime` AS `t1_c6`, `post`.`postedBy` AS `t1_c7`, `user`.`id` AS
`t2_c0`, `user`.`username` AS `t2_c1`, `user`.`password` AS `t2_c2`,
`user`.`salt` AS `t2_c3`, `user`.`email` AS `t2_c4`, `user`.`screenName` AS
`t2_c5`, `user`.`language` AS `t2_c6`, `user`.`interface` AS `t2_c7`,
`user`.`accessType` AS `t2_c8`, `user`.`accessLevel` AS `t2_c9`,
`user`.`isActive` AS `t2_c10`, `user`.`createTime` AS `t2_c11` FROM
`w3_forum_topics` `t` LEFT OUTER JOIN `w3_forum_posts` `post` ON
(`post`.`topicId`=`t`.`id`) LEFT OUTER JOIN `w3_user` `user` ON
(`t`.`postedBy`=`user`.`id`) WHERE (`t`.`sectionId`=1)
This works well but I’d like to know if it is possible to retrieve only the user.username foreign column (in order to make a shorter query and of course to do less memory usage.
There have already been some discussion on this topic (but I cannot find them… sorry) and the main point was that the memory usage for the other columns is not influent.
I mean less CActiverecord model properties (resut of model()->findAll) should result into lighter instances so less memory usage.
Is Yii able to remove the following :
`user`.`password` AS `t2_c2`,
`user`.`salt` AS `t2_c3`,
`user`.`email` AS `t2_c4`,
`user`.`screenName` AS `t2_c5`,
`user`.`language` AS `t2_c6`,
`user`.`interface` AS `t2_c7`,
`user`.`accessType` AS `t2_c8`,
`user`.`accessLevel` AS `t2_c9`,
`user`.`isActive` AS `t2_c10`,
`user`.`createTime` AS `t2_c11`
