javascript - Query from multiple tables in supabase? - Stack Overflow

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I have 2 tables in supabase. We have a post table and an image table. Each post contains multiple images. In my image table, I have the post_id and url. The post_id is a foreign key to post's id.

Post Table:
| id       | contents       |
| -------- | -------------- |
| 1        | some content 1 |
| 2        | some content 2 |  

Image Table:
| id       | url                 | post_id|
| -------- | ------------------- | ------ |
| 10       | url2            | 1      |
| 11       | url1            | 2      |
| 12       | url3            | 2      |

I want my output to look like:

[
  {
    "id": 1,
    "content": "some content 1"
    "images": [
      "url2"
    ]
  },
  {
    "id": 2,
    "content": "some content 2"
    "images": [
      "url1",
      "url3"
    ]
  }
]

My fetch request looks something like this:

const fetchPosts = async (start, end) => {
    console.log(`Fetching all posts...`);

    return await supabase
    .getClient()
    .from('post')
    .select('*')
    .order('inserted_at', { ascending: false })
    .range(start, end);
}

and then I'm fetching images using each post id from that query. Is there away for me to just use one supabase query instead of looping through each post and fetching what images are linked to that post?

I have 2 tables in supabase. We have a post table and an image table. Each post contains multiple images. In my image table, I have the post_id and url. The post_id is a foreign key to post's id.

Post Table:
| id       | contents       |
| -------- | -------------- |
| 1        | some content 1 |
| 2        | some content 2 |  

Image Table:
| id       | url                 | post_id|
| -------- | ------------------- | ------ |
| 10       | url2.            | 1      |
| 11       | url1.            | 2      |
| 12       | url3.            | 2      |

I want my output to look like:

[
  {
    "id": 1,
    "content": "some content 1"
    "images": [
      "url2."
    ]
  },
  {
    "id": 2,
    "content": "some content 2"
    "images": [
      "url1.",
      "url3."
    ]
  }
]

My fetch request looks something like this:

const fetchPosts = async (start, end) => {
    console.log(`Fetching all posts...`);

    return await supabase
    .getClient()
    .from('post')
    .select('*')
    .order('inserted_at', { ascending: false })
    .range(start, end);
}

and then I'm fetching images using each post id from that query. Is there away for me to just use one supabase query instead of looping through each post and fetching what images are linked to that post?

• javascript
• supabase
• supabase-database

Share Improve this question Follow edited Jan 25, 2023 at 13:48 Mansueli 7,04488 gold badges4040 silver badges6767 bronze badges asked Jan 24, 2023 at 16:06 Misu KumaMisu Kuma 12522 silver badges1111 bronze badges

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1 Answer 1

Sorted by: Reset to default 4

You can use JOIN queries using Supabase, e.g:

const { data, error } = await supabase
  .from('image')
  .select(`
    id, url, post_id
    post (
      content
    )
  `)

Depending on their plexity, you can also encapsulate these calls in RPC functions.

For joins in multiple tables, then you can do the following:

const { data, error } = await supabase
  .from('products')
  .select(`
    id,
    supplier:supplier_id ( name ),
    purchaser:purchaser_id ( name )
  `)

It is important to set the Foreign key as part of your primary key as part of the way PostgREST v10 detects relationships.

Image Table Primary key should be:

alter table image drop constraint image_pkey, add primary key (id, post_id);

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