How to get unique products in ActiveRecord
I'm adding search feature to a Rails application. The database is a postgres db and there are two types of products, parent and variant all saved in the same table. Where a variant could have only one product based on the parent_id column and a parent could have many variants.
The search could be by title, seller_sku, price, product_type and so on. The problem is that If the query returns a variant, I would like to replace it with its parent.
With that said if multiple variants of the same parent meet that query and get replaced by there parent, it would give a duplicate. This is not good because of the pagination that happen on the database level it won't be good to filter the duplicates at the application level since the number of products to be returned won't be less than what the user wants to see.
For example if the user wants to see 10 products that meets a query and that query happens to find 4 variants of the same parent, if I replace them with the parent and then remove the duplicates that would result in just 7 products being returned even if there are 100 others.
I can do that on the application level by sending the query to the database again with some offset an limit, but I don't like that approach. I want to know if there is a way to do that processing at the database level with the query itself?
I hope I was able to explain the issue clearly.
ruby-on-rails search postgresql-9.6
asked Dec 27 at 13:35
Nafaa Boutefer
1,4681515
add a comment |
I'm adding search feature to a Rails application. The database is a postgres db and there are two types of products, parent and variant all saved in the same table. Where a variant could have only one product based on the parent_id column and a parent could have many variants.
The search could be by title, seller_sku, price, product_type and so on. The problem is that If the query returns a variant, I would like to replace it with its parent.
With that said if multiple variants of the same parent meet that query and get replaced by there parent, it would give a duplicate. This is not good because of the pagination that happen on the database level it won't be good to filter the duplicates at the application level since the number of products to be returned won't be less than what the user wants to see.
For example if the user wants to see 10 products that meets a query and that query happens to find 4 variants of the same parent, if I replace them with the parent and then remove the duplicates that would result in just 7 products being returned even if there are 100 others.
I can do that on the application level by sending the query to the database again with some offset an limit, but I don't like that approach. I want to know if there is a way to do that processing at the database level with the query itself?
I hope I was able to explain the issue clearly.
ruby-on-rails search postgresql-9.6
asked Dec 27 at 13:35
Nafaa Boutefer
1,4681515
add a comment |
I'm adding search feature to a Rails application. The database is a postgres db and there are two types of products, parent and variant all saved in the same table. Where a variant could have only one product based on the parent_id column and a parent could have many variants.
The search could be by title, seller_sku, price, product_type and so on. The problem is that If the query returns a variant, I would like to replace it with its parent.
With that said if multiple variants of the same parent meet that query and get replaced by there parent, it would give a duplicate. This is not good because of the pagination that happen on the database level it won't be good to filter the duplicates at the application level since the number of products to be returned won't be less than what the user wants to see.
For example if the user wants to see 10 products that meets a query and that query happens to find 4 variants of the same parent, if I replace them with the parent and then remove the duplicates that would result in just 7 products being returned even if there are 100 others.
I can do that on the application level by sending the query to the database again with some offset an limit, but I don't like that approach. I want to know if there is a way to do that processing at the database level with the query itself?
I hope I was able to explain the issue clearly.
ruby-on-rails search postgresql-9.6
asked Dec 27 at 13:35
Nafaa Boutefer
1,4681515
I'm adding search feature to a Rails application. The database is a postgres db and there are two types of products, parent and variant all saved in the same table. Where a variant could have only one product based on the parent_id column and a parent could have many variants.
The search could be by title, seller_sku, price, product_type and so on. The problem is that If the query returns a variant, I would like to replace it with its parent.
With that said if multiple variants of the same parent meet that query and get replaced by there parent, it would give a duplicate. This is not good because of the pagination that happen on the database level it won't be good to filter the duplicates at the application level since the number of products to be returned won't be less than what the user wants to see.
For example if the user wants to see 10 products that meets a query and that query happens to find 4 variants of the same parent, if I replace them with the parent and then remove the duplicates that would result in just 7 products being returned even if there are 100 others.
I can do that on the application level by sending the query to the database again with some offset an limit, but I don't like that approach. I want to know if there is a way to do that processing at the database level with the query itself?
I hope I was able to explain the issue clearly.
ruby-on-rails search postgresql-9.6
ruby-on-rails search postgresql-9.6
asked Dec 27 at 13:35
Nafaa Boutefer
1,4681515
asked Dec 27 at 13:35
Nafaa Boutefer
1,4681515
asked Dec 27 at 13:35
Nafaa Boutefer
1,4681515
asked Dec 27 at 13:35
Nafaa Boutefer
1,4681515
asked Dec 27 at 13:35
Nafaa Boutefer
1,4681515
1,4681515
add a comment |
add a comment |
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