I have three tables:
users --< users_entities >-- entities
User model:
many_to_many :entities,
:class => Contact, :join_table => :users_entities,
:left_key => :user_id, :right_key => :entity_id
Entity model:
many_to_many :users,
:class => User, :join_table => :users_entities,
:left_key => :entity_id , :right_key => :user_id
In my view, I like to be able to indicate that an entity is a favorite:
class EntitiesController
get '/' do
@entities = Entity.sequel_append(:is_favorite, [a correlated, scalar
query]).order(:name).all
erb :'contacts/index'
end
end
If I was going to approach this as a query, I would write:
select e.*
,case
when (
select 1
from users_entities
where entity_id = e.id
and user_id=[user_id]
) then 'Y'
else 'N'
end is_favorite
from entities e
This is a step in the right direction:
DB[:entities].join(:users_entities, [[:entity_id,:id]]).where(user_id: 1)
What's the recommend approach to including the sub-query? Maybe using
empty?
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