Module: ScopedSearch::QueryBuilder::Field
- Defined in:
- lib/scoped_search/query_builder.rb
Overview
This module gets included into the Field class to add SQL generation.
Instance Method Summary collapse
-
#construct_join_sql(key_relation, num) ⇒ Object
This method construct join statement for a key value table It assume the following table structure
----------
---------
--------
| main | | value | | key | | main_pk | | main_fk | | | | | | key_fk | | key_pk |----------
---------
--------
uniq name for the joins are needed in case that there is more than one condition on different keys in the same query. -
#construct_simple_join_sql(num) ⇒ Object
This method construct join statement for a key value table It assume the following table structure
----------
---------
| main | | key | | main_pk | | value | | | | main_fk |----------
---------
uniq name for the joins are needed in case that there is more than one condition on different keys in the same query. - #reflection_conditions(reflection) ⇒ Object
- #reflection_keys(reflection) ⇒ Object
- #to_ext_method_sql(key, operator, value, &block) ⇒ Object
-
#to_sql(operator = nil, &block) ⇒ Object
Return an SQL representation for this field.
Instance Method Details
#construct_join_sql(key_relation, num) ⇒ Object
This method construct join statement for a key value table It assume the following table structure
+----------+ +---------+ +--------+
| main | | value | | key |
| main_pk | | main_fk | | |
| | | key_fk | | key_pk |
+----------+ +---------+ +--------+
uniq name for the joins are needed in case that there is more than one condition on different keys in the same query.
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# File 'lib/scoped_search/query_builder.rb', line 363 def construct_join_sql(key_relation, num) join_sql = "" connection = klass.connection key = key_relation.to_s.singularize.to_sym key_table = definition.reflection_by_name(klass, key).table_name value_table = klass.table_name.to_s value_table_fk_key, key_table_pk = reflection_keys(definition.reflection_by_name(klass, key)) main_reflection = definition.reflection_by_name(definition.klass, relation) if main_reflection main_table = definition.klass.table_name main_table_pk, value_table_fk_main = reflection_keys(definition.reflection_by_name(definition.klass, relation)) join_sql = "\n INNER JOIN #{connection.quote_table_name(value_table)} #{value_table}_#{num} ON (#{main_table}.#{main_table_pk} = #{value_table}_#{num}.#{value_table_fk_main})" value_table = " #{value_table}_#{num}" end join_sql += "\n INNER JOIN #{connection.quote_table_name(key_table)} #{key_table}_#{num} ON (#{key_table}_#{num}.#{key_table_pk} = #{value_table}.#{value_table_fk_key}) " return join_sql end |
#construct_simple_join_sql(num) ⇒ Object
This method construct join statement for a key value table It assume the following table structure
+----------+ +---------+
| main | | key |
| main_pk | | value |
| | | main_fk |
+----------+ +---------+
uniq name for the joins are needed in case that there is more than one condition on different keys in the same query.
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# File 'lib/scoped_search/query_builder.rb', line 395 def construct_simple_join_sql(num) connection = klass.connection key_value_table = klass.table_name main_table = definition.klass.table_name main_table_pk, value_table_fk_main = reflection_keys(definition.reflection_by_name(definition.klass, relation)) join_sql = "\n INNER JOIN #{connection.quote_table_name(key_value_table)} #{key_value_table}_#{num} ON (#{connection.quote_table_name(main_table)}.#{connection.quote_column_name(main_table_pk)} = #{key_value_table}_#{num}.#{connection.quote_column_name(value_table_fk_main)})" return join_sql end |
#reflection_conditions(reflection) ⇒ Object
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# File 'lib/scoped_search/query_builder.rb', line 414 def reflection_conditions(reflection) return unless reflection conditions = reflection.[:conditions] conditions ||= "#{reflection.[:source]}_type = '#{reflection.[:source_type]}'" if reflection.[:source] && reflection.[:source_type] conditions ||= "#{reflection.try(:foreign_type)} = '#{reflection.klass}'" if reflection.[:polymorphic] " AND #{conditions}" if conditions end |
#reflection_keys(reflection) ⇒ Object
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# File 'lib/scoped_search/query_builder.rb', line 406 def reflection_keys(reflection) pk = reflection.klass.primary_key fk = reflection.[:foreign_key] # activerecord prior to 3.1 doesn't respond to foreign_key method and hold the key name in the reflection primary key fk ||= reflection.respond_to?(:foreign_key) ? reflection.foreign_key : reflection.primary_key_name reflection.macro == :belongs_to ? [fk, pk] : [pk, fk] end |
#to_ext_method_sql(key, operator, value, &block) ⇒ Object
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# File 'lib/scoped_search/query_builder.rb', line 422 def to_ext_method_sql(key, operator, value, &block) raise ScopedSearch::QueryNotSupported, "'#{definition.klass}' doesn't respond to '#{ext_method}'" unless definition.klass.respond_to?(ext_method) begin conditions = definition.klass.send(ext_method.to_sym, key, operator, value) rescue StandardError => e raise ScopedSearch::QueryNotSupported, "external method '#{ext_method}' failed with error: #{e}" end raise ScopedSearch::QueryNotSupported, "external method '#{ext_method}' should return hash" unless conditions.kind_of?(Hash) sql = '' conditions.map do |notification, content| case notification when :include then yield(:include, content) when :joins then yield(:joins, content) when :conditions then sql = content when :parameter then content.map{|c| yield(:parameter, c)} end end return sql end |
#to_sql(operator = nil, &block) ⇒ Object
Return an SQL representation for this field. Also make sure that the relation which includes the search field is included in the SQL query.
This function may yield an :include that should be used in the ActiveRecord::Base#find call, to make sure that the field is available for the SQL query.
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# File 'lib/scoped_search/query_builder.rb', line 333 def to_sql(operator = nil, &block) # :yields: finder_option_type, value num = rand(1000000) connection = klass.connection if key_relation yield(:joins, construct_join_sql(key_relation, num) ) yield(:keycondition, "#{key_klass.table_name}_#{num}.#{connection.quote_column_name(key_field.to_s)} = ?") klass_table_name = relation ? "#{klass.table_name}_#{num}" : klass.table_name return "#{connection.quote_table_name(klass_table_name)}.#{connection.quote_column_name(field.to_s)}" elsif key_field yield(:joins, construct_simple_join_sql(num)) yield(:keycondition, "#{key_klass.table_name}_#{num}.#{connection.quote_column_name(key_field.to_s)} = ?") klass_table_name = relation ? "#{klass.table_name}_#{num}" : klass.table_name return "#{connection.quote_table_name(klass_table_name)}.#{connection.quote_column_name(field.to_s)}" elsif relation yield(:include, relation) end column_name = connection.quote_table_name(klass.table_name.to_s) + "." + connection.quote_column_name(field.to_s) column_name = "(#{column_name} >> #{offset*word_size} & #{2**word_size - 1})" if offset column_name end |