In my users table i have column TAGS, that is serialized array, ex. serialize(['fun','promo'])
Then in my Campaign table I have also tags column similar to column in users table.
My question is how to display to user only those campaigns that have at least one tag same as in campaign tags. And if campaign has no tags display to every user no metter which tags they have.
And if user has no tags set display every campaign to him.
How to query that?
$campaign = Campaign::where('tags', $user->tags);
This won't work I know because it has to search in serialized array.
But how can I do that query?
You should normalize the data by storing the tag relationships in separate tables:
campaign_tag
-campaign_id
-tag_id
tag_user
-tag_id
-user_id
The Laravel documentation (https://laravel.com/docs/5.2/eloquent-relationships#many-to-many) has good examples of how to then query/filter the data.
Related
I have three main mySQL tables:
users
tags
news_articles
I also have many to many tables to connect them as needed.
I want to grab all the articles that share the same tags as users so I can personalise their experience.
(example): say a user has tags for "Trump" or "Brexit" I want to grab all the news articles that also have Trump or Brexit.
I could grab the whole data pool and make calculations but that might get unnecessarily server intensive so is there a way of doing it through Eloquent?
Also is Eloquent capable of tallying the user tags to determine which tags the user is most interested in before grabbing the articles or would that need a workaround after?
Thanks in advance.
Christophvh's response did work for me in the end. After some more time with Eloquent I found plenty more ways of doing this.
A way I would go about this now for anyone who happens to be stuck:
By creating a tags method in my User and Article models to return all related tags I can then do the following.
$userTags = $user->tags()->pluck('name')->get()->toArray();
$articles = Article::whereHas('tags', function($tag) use ($userTags) {
$tag->where('name', $userTags)->get();
})->get();
The above code should:
Get only the name field of all tags belonging to a user and store them in an array.
Grab all articles where their related tags name field contain any tag in the $userTags variable
To create a priority tags list I would just need to run array_count_values($userTags) and order it by the returned values, then pass the new ordered $userTags array into the Eloquent query.
I am creating a news web application, and each news has a category field, but this category can be one, or many at times. Which means, that a person may enter politics, world, us tags for just one news article. Now, the problem I have is how to insert this into a database. If I just enter the tags directly to database, as pure text, then I when I have to echo it, I could use explode() to separate them, like
$row['tags] = 'politics, world, us';
foreach(explode($row['tags') as $tag){
echo "<a href='{$tag}'> {$tag} </a> ";
}
Which would echo the tags, and create a hyperlink for each tag, but the problem I have with this is that, if user wants to just see a news with a specific tag, it becomes problem because there is ~no way I could query all the rows, sort out, explode the tags and just show the news feed like that. It is doable, but very cumbersome. So, I would like to ask how to do this. I am certain it involves, having having maybe another table called tags but that is as far as I can go
The proper way to do this is to make a many to many relationship in database. This would require additional table containing id's of categories and articles related to each other
Look at this example of multiple users with multiple roles:
In the same way, you can create a relationship of articles to categories
You can either use a SET to store the data or, which I suggest, add another table for tags and one which stores relations between articles and tags as mentioned by Maciej.
articles table:
id | title | content
tags table:
id | label
articles_tags table:
article_id | tag_id
Consider adding foreign key constraints to the last table, this will make your life easier.
I want to create a posting system to a profile. I created a database for storing all users posts each user have a table.
Ihad created another database for storing the comments of each posts. My logic is to create each table in the comments database and store each comment in that.
Is there a logic to link the post and the comments. I thought to use mysql last insert id but it will return last id which will create error because one of the post will not have a table.
Is there any other way?
Another way would be to have a single table for posts, and identify a user post in the table using a userid column. To find all posts by a particular user, simply query by the user's ID. By doing so, you have a single table to manage, and you can do a lookup easily. If you create separate tables for each user, you have to create additional logic to first figure out which table to use. If a user is removed, you delete a table, rather than simply removing some rows from a common table.
The same logic applies to the comments table - add columns for postid',commentid,userid`. Again, a single table contains all the comments. To find comments on a particular post, you would do a simple query such as
select comment_text
from comments_table
where postid = ?
The whole purpose of using MySQL is to leverage relationships between entities, i.e. a user owns posts, a post is linked to comments.
If you do not want to use a relational schema like this, take a look at NoSQL DBs.
You have a couple options here:
Add a user_id column to your posts table, and a post_id, and user_id column to your comments table. You can then setup foreign keys with one-to-many relationships.
Only use a single table that has (in addition to your existing) a user_id, and type column. Type will define comment/post/etc. This can be defined with intermediary tables as a number mapped to a CONST, string, or any other way that you see fit (intermediary best option imho).
Vary the above example and use 2 intermediary tables to match users to posts and comments to posts (possibly also users to comments).
I am new to MySQL and PHP. I am having issues wrapping my mind around how to accomplish something. I am building a site that has basically a forum style post page. Users enter text into a textarea which then posts that text along with a timestamp and $_SESSION['Username'] into a MySQL table titled "campaigns." So the table has postEntry, postName and postDate rows currently.
On this same page that I have the form, I then display the entire contents of the campaigns table into a div. So it can show each post in descending order.
This has been working great for me, but I am now trying to look at the bigger picture and am thinking this is not a good way to do what I need. I basically need the ability to have an endless amount of "campaigns" each with their own set of posts. Then give the user the ability to select which campaign they want to view and show corresponding posts for that campaign in the div.
So the real question is: Is there a way to do this with just one table. Or would each campaign need it's own table in the database?
Add a campaign_id to the POST table and viola!
edit: more info:
you need one table for the campaign like so:
Campaign
-------------
campaign_id
name
then you need another one for all the posts
post
-------------
post_id
campaign_id
post_time
name
this way, each post is associated to a specific named campaign.
Some difficulties with "condition"
I have a table Tags with fields : id, name, count
I have table PagesTags with fields : id, page_id and tag_id
I have table Pages with several fields : id, name, shownmenu, onilne.
In my TagsController, I have a simple code to extract and display the Tags
function tagsList(){
//$this->loadModel('PageTag');
return $this->Tag->find('all',
array('order'=>'name ASC','conditions'=>array('Tag.count >= 0')));
}
The problem is, I do not want to display the tags associated to a page which is Offline.
Then in my aboce I should use somethink like $this->loadModel('PageTag'); to get the Id of the associated page and a second $this->loadModel('Page');
to get the page status 'online' (true/false)
Can we do it at once?
How can I do it simply?
How can I look in two table at one?
You need to use model relationships to link your models together. Read the manual about it or see my answer on this topic here:
CakePHP 1.3 - Unknown column in where clause
In your case, PagesTags hasOne Page and hasMany Tags. You will write these relationships into the model. Also you will write into Tags model that it hasOne PagesTags, which will in turn retrieve the associated Page.
After you have done all of that, you don't need to call loadModel, you just query Tag and it will implicitly join the associated PagesTags and Page records, so you can just put this into your conditions:
'Page.status !=' => 'Offline'
I think the relation of the table is HABTM so you have to look this component for searching http://bakery.cakephp.org/articles/Kumazatheef/2008/10/22/habtm-searching