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module Arel
class Relation
@@connection_tables_primary_keys = {}
def compiler
@compiler ||= begin
"Arel::SqlCompiler::#{engine.adapter_name}Compiler".constantize.new(self)
rescue
Arel::SqlCompiler::GenericCompiler.new(self)
end
end
def to_sql(formatter = Sql::SelectStatement.new(self))
formatter.select compiler.select_sql, self
end
def christener
@christener ||= Sql::Christener.new
end
def inclusion_predicate_sql
"IN"
end
def primary_key
connection_id = engine.connection.object_id
if @@connection_tables_primary_keys[connection_id] && @@connection_tables_primary_keys[connection_id].has_key?(table.name)
@@connection_tables_primary_keys[connection_id][table.name]
else
@@connection_tables_primary_keys[connection_id] ||= {}
@@connection_tables_primary_keys[connection_id][table.name] = engine.connection.primary_key(table.name)
end
end
protected
def from_clauses
sources.blank? ? table_sql(Sql::TableReference.new(self)) : sources
end
def select_clauses
attributes.collect { |a| a.to_sql(Sql::SelectClause.new(self)) }
end
def where_clauses
wheres.collect { |w| w.to_sql(Sql::WhereClause.new(self)) }
end
def group_clauses
groupings.collect { |g| g.to_sql(Sql::GroupClause.new(self)) }
end
def having_clauses
havings.collect { |g| g.to_sql(Sql::HavingClause.new(self)) }
end
def order_clauses
orders.collect { |o| o.to_sql(Sql::OrderClause.new(self)) }
end
end
end
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