How to override the query in has_many relationship
I need to override the defailt ActiveRecord generated SQL query in a has_many relationship. While finder_sql is deprecated in Rails 4.
In a given legacy application there are multiple relationships between customers and their available discounts. It looks like this:
A Rails 4 scope on discounts to fetch all available discounts for a given customer:
scope :for_customer, lambda { |customer|
where("CustomerNo = '#{customer.CustomerNo}'
OR DiscountGrpCustNo = '#{customer.DiscountGrpCustNo}'
OR PriceListNo = '#{customer.PriceListNo}'")
}
So I wanted to use this scope to define the has_many on the customer.
I found an explanation for using variables on a has_many in a different question here: https://stackoverflow.com/a/2462397/1062276
So I tried:
has_many :discounts,
-> (customer) { for_customer(customer) }
Which resulted in Invalid column name 'customer_id' due to the following:
> customer.discounts.to_sql
SELECT [KuraasAS].[DiscountAgreementCustomer].* FROM [KuraasAS].[DiscountAgreementCustomer] WHERE [KuraasAS].[DiscountAgreementCustomer].[customer_id] = 12345 AND (CustomerNo = '12345'
OR DiscountGrpCustNo = '5'
OR PriceListNo = '3')
The customer_id column is Rails's assumption. How can I take this out of the query?
ruby-on-rails
sql-server activerecord override asked Nov 22 '18 at 9:34
ringeringe
632311
add a comment |
I need to override the defailt ActiveRecord generated SQL query in a has_many relationship. While finder_sql is deprecated in Rails 4.
In a given legacy application there are multiple relationships between customers and their available discounts. It looks like this:
A Rails 4 scope on discounts to fetch all available discounts for a given customer:
scope :for_customer, lambda { |customer|
where("CustomerNo = '#{customer.CustomerNo}'
OR DiscountGrpCustNo = '#{customer.DiscountGrpCustNo}'
OR PriceListNo = '#{customer.PriceListNo}'")
}
So I wanted to use this scope to define the has_many on the customer.
I found an explanation for using variables on a has_many in a different question here: https://stackoverflow.com/a/2462397/1062276
So I tried:
has_many :discounts,
-> (customer) { for_customer(customer) }
Which resulted in Invalid column name 'customer_id' due to the following:
> customer.discounts.to_sql
SELECT [KuraasAS].[DiscountAgreementCustomer].* FROM [KuraasAS].[DiscountAgreementCustomer] WHERE [KuraasAS].[DiscountAgreementCustomer].[customer_id] = 12345 AND (CustomerNo = '12345'
OR DiscountGrpCustNo = '5'
OR PriceListNo = '3')
The customer_id column is Rails's assumption. How can I take this out of the query?
ruby-on-rails
sql-server activerecord override asked Nov 22 '18 at 9:34
ringeringe
632311
add a comment |
I need to override the defailt ActiveRecord generated SQL query in a has_many relationship. While finder_sql is deprecated in Rails 4.
In a given legacy application there are multiple relationships between customers and their available discounts. It looks like this:
A Rails 4 scope on discounts to fetch all available discounts for a given customer:
scope :for_customer, lambda { |customer|
where("CustomerNo = '#{customer.CustomerNo}'
OR DiscountGrpCustNo = '#{customer.DiscountGrpCustNo}'
OR PriceListNo = '#{customer.PriceListNo}'")
}
So I wanted to use this scope to define the has_many on the customer.
I found an explanation for using variables on a has_many in a different question here: https://stackoverflow.com/a/2462397/1062276
So I tried:
has_many :discounts,
-> (customer) { for_customer(customer) }
Which resulted in Invalid column name 'customer_id' due to the following:
> customer.discounts.to_sql
SELECT [KuraasAS].[DiscountAgreementCustomer].* FROM [KuraasAS].[DiscountAgreementCustomer] WHERE [KuraasAS].[DiscountAgreementCustomer].[customer_id] = 12345 AND (CustomerNo = '12345'
OR DiscountGrpCustNo = '5'
OR PriceListNo = '3')
The customer_id column is Rails's assumption. How can I take this out of the query?
ruby-on-rails
sql-server activerecord override asked Nov 22 '18 at 9:34
ringeringe
632311
I need to override the defailt ActiveRecord generated SQL query in a has_many relationship. While finder_sql is deprecated in Rails 4.
In a given legacy application there are multiple relationships between customers and their available discounts. It looks like this:
A Rails 4 scope on discounts to fetch all available discounts for a given customer:
scope :for_customer, lambda { |customer|
where("CustomerNo = '#{customer.CustomerNo}'
OR DiscountGrpCustNo = '#{customer.DiscountGrpCustNo}'
OR PriceListNo = '#{customer.PriceListNo}'")
}
So I wanted to use this scope to define the has_many on the customer.
I found an explanation for using variables on a has_many in a different question here: https://stackoverflow.com/a/2462397/1062276
So I tried:
has_many :discounts,
-> (customer) { for_customer(customer) }
Which resulted in Invalid column name 'customer_id' due to the following:
> customer.discounts.to_sql
SELECT [KuraasAS].[DiscountAgreementCustomer].* FROM [KuraasAS].[DiscountAgreementCustomer] WHERE [KuraasAS].[DiscountAgreementCustomer].[customer_id] = 12345 AND (CustomerNo = '12345'
OR DiscountGrpCustNo = '5'
OR PriceListNo = '3')
The customer_id column is Rails's assumption. How can I take this out of the query?
ruby-on-rails
sql-server activerecord override ruby-on-rails
sql-server activerecord override asked Nov 22 '18 at 9:34
ringeringe
632311
asked Nov 22 '18 at 9:34
ringeringe
632311
asked Nov 22 '18 at 9:34
ringeringe
632311
asked Nov 22 '18 at 9:34
ringeringe
632311
asked Nov 22 '18 at 9:34
ringeringe
632311
632311
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
To override the default generated query in a Rails 4 has_many relationship I did the following:
has_many :discounts,
-> (cu) { unscope(:where).for_customer(cu) }
The method to look up and make use of is unscope
answered Nov 22 '18 at 9:37
ringeringe
632311
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
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active
oldest
votes
To override the default generated query in a Rails 4 has_many relationship I did the following:
has_many :discounts,
-> (cu) { unscope(:where).for_customer(cu) }
The method to look up and make use of is unscope
answered Nov 22 '18 at 9:37
ringeringe
632311
add a comment |
To override the default generated query in a Rails 4 has_many relationship I did the following:
has_many :discounts,
-> (cu) { unscope(:where).for_customer(cu) }
The method to look up and make use of is unscope
answered Nov 22 '18 at 9:37
ringeringe
632311
add a comment |
To override the default generated query in a Rails 4 has_many relationship I did the following:
has_many :discounts,
-> (cu) { unscope(:where).for_customer(cu) }
The method to look up and make use of is unscope
answered Nov 22 '18 at 9:37
ringeringe
632311
To override the default generated query in a Rails 4 has_many relationship I did the following:
has_many :discounts,
-> (cu) { unscope(:where).for_customer(cu) }
The method to look up and make use of is unscope
answered Nov 22 '18 at 9:37
ringeringe
632311
answered Nov 22 '18 at 9:37
ringeringe
632311
answered Nov 22 '18 at 9:37
ringeringe
632311
answered Nov 22 '18 at 9:37
ringeringe
632311
632311
add a comment |
add a comment |
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