Module: HasDynamicColumns::ActiveRecord::QueryMethods

Defined in:
lib/has_dynamic_columns/active_record/query_methods.rb

Defined Under Namespace

Modules: WhereChainCompatibility

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/has_dynamic_columns/active_record/query_methods.rb', line 4

def self.included(base)

	base.class_eval do
		alias_method_chain :where, :dynamic_columns
		alias_method_chain :build_arel, :dynamic_columns
	end

	base.instance_eval do
		def has_dynamic_column_values=a
		end
		def has_dynamic_column_values
		end
	end
end

Instance Method Details

#build_arel_with_dynamic_columns ⇒ Object

When arel starts building - filter



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# File 'lib/has_dynamic_columns/active_record/query_methods.rb', line 20

def build_arel_with_dynamic_columns
	#arel = Arel::SelectManager.new(table.engine, table)

	# Calculate any dynamic scope that was passed
	self.has_dynamic_columns_values.each { |dynamic_scope|
		field_scope = dynamic_scope[:scope]	
		field_scope_id = (!field_scope.nil?) ? field_scope.id : nil
		field_scope_type = (!field_scope.nil?) ? field_scope.class.name.constantize.to_s : nil

		# TODO - make this work on compound arel queries like: table[:last_name].eq("Paterson").or(table[:first_name].eq("John"))
		#collapsed = collapse_wheres(arel, dynamic_scope[:where])

		dynamic_scope[:where].each_with_index { |rel, index|
			case rel
			when String
				next
			else
				dynamic_type = rel.left.relation.engine.to_s
				col_name = rel.left.name
				value = rel.right
			end

			column_table = HasDynamicColumns::DynamicColumn.arel_table.alias("dynamic_where_#{index}_#{col_name}")
			column_datum_table = HasDynamicColumns::DynamicColumnDatum.arel_table.alias("dynamic_where_data_#{index}_#{col_name}")

			# Join on the column with the key
			on_query = column_table[:key].eq(col_name)
			on_query = on_query.and(
				column_table[:field_scope_type].eq(field_scope_type)
			) unless field_scope_type.nil?

			on_query = on_query.and(
				column_table[:field_scope_id].eq(field_scope_id)
			) unless field_scope_id.nil?

			column_table_join_on = column_table
									.create_on(
										on_query
									)

			column_table_join = table.create_join(column_table, column_table_join_on)
			self.joins_values += [column_table_join]

			arel_node = case rel
				when Arel::Nodes::Equality
					column_datum_table[:value].eq(value)
				else
					column_datum_table[:value].matches(value)
			end

			# Join on all the data with the provided key
			column_table_datum_join_on = column_datum_table
									.create_on(
										column_datum_table[:owner_id].eq(table[:id]).and(
											column_datum_table[:owner_type].eq(dynamic_type)
										).and(
											column_datum_table[:dynamic_column_id].eq(column_table[:id])
										).and(
											arel_node
										)
									)

			column_table_datum_join = table.create_join(column_datum_table, column_table_datum_join_on)
			self.joins_values += [column_table_datum_join]
		}
	}

	build_arel_without_dynamic_columns
end

#where_with_dynamic_columns(opts = :chain, *rest) ⇒ Object 



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# File 'lib/has_dynamic_columns/active_record/query_methods.rb', line 128

def where_with_dynamic_columns(opts = :chain, *rest)
	if opts == :chain
		scope = spawn
		chain = ::ActiveRecord::QueryMethods::WhereChain.new(scope)
		chain.send(:extend, WhereChainCompatibility)
	else
		where_without_dynamic_columns(opts, rest)
	end
end