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Versions: 16
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Contents
module Arel
module Visitors
class SQLServer < Arel::Visitors::ToSql
def make_Fetch_Possible_And_Deterministic o
return if o.limit.nil? && o.offset.nil?
t = table_From_Statement o
pk = primary_Key_From_Table t
return unless pk
if o.orders.empty?
# Prefer deterministic vs a simple `(SELECT NULL)` expr.
# CPK
#o.orders = [pk.asc]
o.orders = pk.map {|a_pk| a_pk.asc}
end
end
def primary_Key_From_Table t
return unless t
column_name = @connection.schema_cache.primary_keys(t.name) ||
@connection.schema_cache.columns_hash(t.name).first.try(:second).try(:name)
# CPK
# column_name ? t[column_name] : nil
case column_name
when Array
column_name.map do |name|
t[name]
end
when NilClass
nil
else
[t[column_name]]
end
end
end
end
end
Version data entries
16 entries across 16 versions & 1 rubygems