Ruby mongo - array map add another field

Question

I have a MongoDB model like:

Posts: id, category, data[title, description, slug..]

I was adding my data to my_array but now I need to add category field

my_array = []

my_array[:posts] = Posts.all.to_a.map { |p| p.data }

How can I merge them to see this result?

my_array: {[ category1, title1, description1, slug1], [ category2, title2, description2, slug2]}

So, I want to push the category field into the same array, but I don't know how to change this query

 my_array[:posts] = Posts.all.to_a.map { |p| p.data }

can you please explain what do you want to merge? do you want to merge the multiple arrays into one big array with all the fields? — Mshka
– Mshka, Commented Apr 10, 2021 at 10:49
no, I want to add the category field to my_array. But category and data array should be same level.. — Crazy Coders
– Crazy Coders, Commented Apr 10, 2021 at 10:52
I can do my_array[:posts] = Posts.all.to_a.map { |p| p } and get all posts , but if i do so, data and category won't be in same level.. — Crazy Coders
– Crazy Coders, Commented Apr 10, 2021 at 10:53

Mshka · Accepted Answer · 2021-04-10 11:19:46Z

1

if you want to merge the category to the hash you will need to get the data then merge a category key with the category

my_array[:posts] = Posts.all.to_a.map { |p| p.data.merge(category: p.category) }

answered Apr 10, 2021 at 10:55

Mshka

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8 Comments

I've tried it but could not get the category field..

can you post what you actually got out of one record and post the record's columns as well?

Actually i get it into array but its like: [{'title' => 'a' , 'descrition'=> 'a'}, BSON::ObjectId('60715018bee8403af3a10d11') ]

if you check my answer, category_id is a bson object. But it's not on same level with other data. It's not in same curly brackets..

are you able to call .str on the BSON::ObjectId('60715018bee8403af3a10d11') and get the value back?

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