Error Using Multiple Models in CCv5

Question

I have left CCv4 out of frustration, because though it doesn't have this very issue, I have difficulty in creation and editing of records. So, hopefully, with your help, this will work out.I am trying to create a means for users to submit article on the frontend, using CF and CC. Also, I need to add some new fields to Joomla's content. To prevent future updates from destroying the website, I decided to create a new DB table to hold all the needed extra fields.The problem I'm having right now is that I cannot get CCv5 to fetch data from the extra table. Surprisingly though, I was able to get data from the users table on the first try.Below is the structure of the extra table:tbl_content_extra[list]idarticle_idcategoryapproved[/list]I have tried all possible combination of settings within the model setting, but none is working.In Join Conditions, I have "Article.id"); ?>I have enabled debug and this is what is returnedArray
(
    [0] => SELECT `Extension`.`id` AS `Extension.id`, `Extension`.`name` AS `Extension.name` FROM `o7ge4_chronoengine_extensions` AS `Extension` WHERE `Extension`.`enabled` = '1' ORDER BY `Extension`.`ordering` ASC
    [1] => SELECT `Connection`.`id` AS `Connection.id`, `Connection`.`title` AS `Connection.title`, `Connection`.`params` AS `Connection.params`, `Connection`.`extras` AS `Connection.extras`, `Connection`.`published` AS `Connection.published` FROM `o7ge4_chronoengine_connections` AS `Connection` WHERE `Connection`.`title` = 'Briefs' AND `Connection`.`published` = '1'
    [2] => SELECT COUNT(*) AS `Article.count` FROM `o7ge4_content` AS `Article` LEFT JOIN `o7ge4_content_extra` AS `Extra` ON `Extra`.`article_id` = 'Article.id' LEFT JOIN `o7ge4_users` AS `Author` ON `Article`.`created_by` = 'Author.id' WHERE `Article`.`catid` = '8' GROUP BY `Article`.`id`, `Article`.`id`
    [3] => SELECT `Article`.`id` AS `Article.id`, `Article`.`asset_id` AS `Article.asset_id`, `Article`.`title` AS `Article.title`, `Article`.`alias` AS `Article.alias`, `Article`.`introtext` AS `Article.introtext`, `Article`.`fulltext` AS `Article.fulltext`, `Article`.`state` AS `Article.state`, `Article`.`catid` AS `Article.catid`, `Article`.`created` AS `Article.created`, `Article`.`created_by` AS `Article.created_by`, `Article`.`created_by_alias` AS `Article.created_by_alias`, `Article`.`modified` AS `Article.modified`, `Article`.`modified_by` AS `Article.modified_by`, `Article`.`checked_out` AS `Article.checked_out`, `Article`.`checked_out_time` AS `Article.checked_out_time`, `Article`.`publish_up` AS `Article.publish_up`, `Article`.`publish_down` AS `Article.publish_down`, `Article`.`images` AS `Article.images`, `Article`.`urls` AS `Article.urls`, `Article`.`attribs` AS `Article.attribs`, `Article`.`version` AS `Article.version`, `Article`.`ordering` AS `Article.ordering`, `Article`.`metakey` AS `Article.metakey`, `Article`.`metadesc` AS `Article.metadesc`, `Article`.`access` AS `Article.access`, `Article`.`hits` AS `Article.hits`, `Article`.`metadata` AS `Article.metadata`, `Article`.`featured` AS `Article.featured`, `Article`.`language` AS `Article.language`, `Article`.`xreference` AS `Article.xreference`, `Extra`.`id` AS `Extra.id`, `Extra`.`article_id` AS `Extra.article_id`, `Extra`.`approved` AS `Extra.approved`, `Extra`.`approved_by` AS `Extra.approved_by`, `Extra`.`approve_time` AS `Extra.approve_time`, `Extra`.`category` AS `Extra.category`, `Extra`.`article_week` AS `Extra.article_week`, `Author`.`id` AS `Author.id`, `Author`.`name` AS `Author.name`, `Author`.`username` AS `Author.username`, `Author`.`email` AS `Author.email`, `Author`.`password` AS `Author.password`, `Author`.`block` AS `Author.block`, `Author`.`sendEmail` AS `Author.sendEmail`, `Author`.`registerDate` AS `Author.registerDate`, `Author`.`lastvisitDate` AS `Author.lastvisitDate`, `Author`.`activation` AS `Author.activation`, `Author`.`params` AS `Author.params`, `Author`.`lastResetTime` AS `Author.lastResetTime`, `Author`.`resetCount` AS `Author.resetCount`, `Author`.`otpKey` AS `Author.otpKey`, `Author`.`otep` AS `Author.otep` FROM `o7ge4_content` AS `Article` LEFT JOIN `o7ge4_content_extra` AS `Extra` ON `Extra`.`article_id` = 'Article.id' LEFT JOIN `o7ge4_users` AS `Author` ON `Article`.`created_by` = 'Author.id' WHERE `Article`.`catid` = '8' GROUP BY `Article`.`id`, `Article`.`id` ORDER BY `Article`.`created` LIMIT 30
)When I typed the query code into PHPMyAdmin, it showed that all the fields for ModelID Extra contained NULL values, while the rest (Author and Article) contained the correct values.Please, if anyone has any idea about how I can solve this, kindly reply ASAP.Thanks in advance.