CODEWITHSUNDEEP
ruby-on-railsjoinrelational-databasepredicatearel
aarona
aarona

Reputation: 37303

Arel: Need help converting SQL statement into Arel code for Rails

Trying to get the following SQL to work in a Rails query.

The Query:

select addr.*
  from addresses addr
  join users u
    on addr.addressable_type = 'User'
   and addr.addressable_id = u.id
  join customers c 
    on c.id = u.actable_id
   and u.actable_type = 'Customer' 
 where c.account_id = 1
   and c.site_contact = 't'

This is my Rails code:

# Inside my account.rb model
def site_addresses
    a = Address.arel_table #Arel::Table.new(:addresses)
    u = User.arel_table #Arel::Table.new(:users)
    c = Customer.arel_table #Arel::Table.new(:customers)

    # trying to debug/test by rendering the sql. Eventually, I want
    # to return a relation array of addresses.
    sql = Address.
      joins(u).
        on(a[:addressable_type].eq("User").and(a[:addressable_id].eq(u[:id]))).
      joins(c).
        on(c[:id].eq(u[:actable_id]).and(u[:actable_type].eq("Customer"))).
     where(c[:account_id].eq(self.id).and(c[:site_contact].eq(true))).to_sql

    raise sql.to_yaml #trying to debug, I'll remove this later
  end
end

I'm getting errors like "unknown class: Arel::Table". Im not using Arel correctly because the SQL code is valid (I can run it on the database just fine)

Upvotes: 0

Views: 1101

Answers (1)

Mario Pérez Alarcón
Mario Pérez Alarcón

Reputation: 3638

Try the following: 

a.join(u).on(a[:addressable_type].eq("User")... # Using the arel_table and "join" instead

I based my answer from the docs:

users.join(photos).on(users[:id].eq(photos[:user_id]))

Upvotes: 2

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