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module ActiveRecord
module Associations
class HasManyThroughAssociation < AssociationProxy #:nodoc:
def initialize(owner, reflection)
super
@finder_sql = construct_conditions
construct_sql
end
def find(*args)
options = Base.send(:extract_options_from_args!, args)
conditions = "#{@finder_sql}"
if sanitized_conditions = sanitize_sql(options[:conditions])
conditions << " AND (#{sanitized_conditions})"
end
options[:conditions] = conditions
if options[:order] && @reflection.options[:order]
options[:order] = "#{options[:order]}, #{@reflection.options[:order]}"
elsif @reflection.options[:order]
options[:order] = @reflection.options[:order]
end
options[:select] = construct_select
options[:from] = construct_from
merge_options_from_reflection!(options)
# Pass through args exactly as we received them.
args << options
@reflection.klass.find(*args)
end
def reset
@target = []
@loaded = false
end
protected
def method_missing(method, *args, &block)
if @target.respond_to?(method) || (!@reflection.klass.respond_to?(method) && Class.respond_to?(method))
super
else
@reflection.klass.with_scope(construct_scope) { @reflection.klass.send(method, *args, &block) }
end
end
def find_target
@reflection.klass.find(:all,
:select => construct_select,
:conditions => construct_conditions,
:from => construct_from,
:order => @reflection.options[:order],
:limit => @reflection.options[:limit],
:joins => @reflection.options[:joins],
:group => @reflection.options[:group]
)
end
def construct_conditions
unless through_reflection = @owner.class.reflections[@reflection.options[:through]]
raise ActiveRecordError, "Could not find the association '#{@reflection.options[:through]}' in model #{@reflection.klass}"
end
# Get the actual primary key of the belongs_to association that the reflection is going through
source_primary_key = through_reflection.klass.reflect_on_association(@reflection.name.to_s.singularize.to_sym).primary_key_name
if through_reflection.options[:as]
conditions =
"#{@reflection.table_name}.#{@reflection.klass.primary_key} = #{through_reflection.table_name}.#{source_primary_key} " +
"AND #{through_reflection.table_name}.#{through_reflection.options[:as]}_id = #{@owner.quoted_id} " +
"AND #{through_reflection.table_name}.#{through_reflection.options[:as]}_type = #{@owner.class.quote @owner.class.base_class.name.to_s}"
else
conditions =
"#{@reflection.klass.table_name}.#{@reflection.klass.primary_key} = #{through_reflection.table_name}.#{source_primary_key} " +
"AND #{through_reflection.table_name}.#{through_reflection.primary_key_name} = #{@owner.quoted_id}"
end
conditions << " AND (#{sql_conditions})" if sql_conditions
return conditions
end
def construct_from
"#{@owner.class.reflections[@reflection.options[:through]].table_name}, #{@reflection.table_name}"
end
def construct_select
selected = @reflection.options[:select] || "#{@reflection.table_name}.*"
end
def construct_scope
{
:find => { :from => construct_from, :conditions => construct_conditions },
:create => { @reflection.primary_key_name => @owner.id }
}
end
def construct_sql
case
when @reflection.options[:finder_sql]
@finder_sql = interpolate_sql(@reflection.options[:finder_sql])
@finder_sql = "#{@reflection.klass.table_name}.#{@reflection.primary_key_name} = #{@owner.quoted_id}"
@finder_sql << " AND (#{conditions})" if conditions
end
if @reflection.options[:counter_sql]
@counter_sql = interpolate_sql(@reflection.options[:counter_sql])
elsif @reflection.options[:finder_sql]
# replace the SELECT clause with COUNT(*), preserving any hints within /* ... */
@reflection.options[:counter_sql] = @reflection.options[:finder_sql].sub(/SELECT (\/\*.*?\*\/ )?(.*)\bFROM\b/im) { "SELECT #{$1}COUNT(*) FROM" }
@counter_sql = interpolate_sql(@reflection.options[:counter_sql])
else
@counter_sql = @finder_sql
end
end
end
end
end
|
