问题
Hii i am new to cakephp 3.2 v. Here i have used model association (hasMany). Here in bind section (campaign_videos) ,i want to fetch only one record , so for this ,i have put below code to manage it. my actual data in db.
[
{
"id": 1,
"user_id": 95,
"campaign_videos": [
{
"id": 1,
"campaign_id": 1,
},
{
"id": 3,
"campaign_id": 1,
}
]
},
{
"id": 2,
"user_id": 95,
"campaign_videos": [
{
"id": 2,
"campaign_id": 2,
}
]
},
$fetchCampaignFirst = $this->Campaigns->find()->contain(['CampaignVideos' => ['queryBuilder' => function ($q) {
return $q->limit(1);
}]]);
I am getting this limit working for first data only ,not for others (others even not showing the fetched data).
Below i have written the output
Here i want to get an output like
[
{
"id": 1,
"user_id": 95,
"campaign_videos": [
{
"id": 1,
"campaign_id": 1,
},
]
},
{
"id": 2,
"user_id": 95,
"campaign_videos": [
{
"id": 2,
"campaign_id": 2,
}
]
}]
Only want the first record of campaign_videos. Here after using the queryBuilder query , i am getting out put like.
[
{
"id": 1,
"user_id": 95,
"campaign_videos": [
{
"id": 1,
"campaign_id": 1,
},
]
},
{
"id": 2,
"user_id": 95,
"campaign_videos": [
]
}]
I am not getting any data for second id ,while data is present for it. Please suggest me. Thank you in advance.
回答1:
Maybe I'm wrong (so feel free to downvote my answer) but I think it's not feasible using a simple query
in fact cake, when loading associated data, does a single query on the associated table and after that matches the rows with the corresponding ones in the main table.
So you would need to do a mysql query that find the first record of every category. i.e. something like what is described in this article
I think that the only (or maybe the simpler) solution is to loop through your records:
$campaigns= $this->Campaigns->find();
foreach($campaigns as $campaign)
{
$campaign->campaign_videos = $this->Campaigns->CampaignVideos-find()
->where(['campaign_id' => $campaign->id]
->order(['id' => 'asc'])
->limit(1);
}
来源：https://stackoverflow.com/questions/37292207/querybuilder-limit-is-working-for-only-first-row-in-cakephp-3-2