[英]Codeigniter 3: where clause gives an ambiguous column error
I am working on a basic blog application in Codeigniter 3.1.8 and Bootstrap 4. 我正在Codeigniter 3.1.8和Bootstrap 4中开发一个基本的博客应用程序 。
There are several tables, among which authors
, posts
and categories
which stores the posts categories. 有几个表,其中authors
, posts
和categories
用来存储职位类别。
I am displaying the posts with the name of the category each post belongs to. 我正在显示带有每个帖子所属类别名称的帖子。
I also want to display post filtered by author. 我也想显示按作者过滤的帖子。 In other words, all posts written by an author . 换句话说, 所有作者撰写的帖子 。 For this purpose I have created a method in the Posts_model
model: 为此,我在Posts_model
模型中创建了一个方法:
public function get_posts_by_author($author_id) {
$this->db->select('posts.*,categories.name as post_category');
$this->db->order_by('posts.id', 'DESC');
$this->db->join('categories', 'posts.cat_id = categories.id', 'inner');
$query = $this->db->get_where('posts', array('author_id' => $author_id));
return $query->result();
}
In the Posts
controller, I have the method: 在Posts
控制器中,我有以下方法:
public function byauthor($author_id){
$data = $this->Static_model->get_static_data();
$data['pages'] = $this->Pages_model->get_pages();
$data['categories'] = $this->Categories_model->get_categories();
$data['posts'] = $this->Posts_model->get_posts_by_author($author_id);
echo $author_id;
}
At /posts/byauthor/1
, instead of "1", the author's id, as it was intended, I see Column 'author_id' in where clause is ambiguous
. 在/posts/byauthor/1
,按原意,作者的ID不是“ 1”,而是Column 'author_id' in where clause is ambiguous
看到了Column 'author_id' in where clause is ambiguous
。
Where is my mistake? 我的错误在哪里?
Solved the problem by changing the method in the model to: 通过将模型中的方法更改为解决以下问题:
public function get_posts_by_author($authorid) {
$this->db->select('posts.*,categories.name as post_category');
$this->db->order_by('posts.id', 'DESC');
$this->db->join('categories', 'posts.cat_id = categories.id', 'inner');
// the line below was changed
$query = $this->db->get_where('posts', array('posts.author_id' => $authorid));
return $query->result();
}
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