Class: ForestLiana::FiltersParser
- Inherits:
-
Object
- Object
- ForestLiana::FiltersParser
- Defined in:
- app/services/forest_liana/filters_parser.rb
Constant Summary collapse
- AGGREGATOR_OPERATOR =
%w(and or)
Instance Method Summary collapse
- #apply_filters ⇒ Object
- #apply_filters_on_previous_interval(previous_condition) ⇒ Object
- #ensure_valid_aggregation(node) ⇒ Object
- #ensure_valid_condition(condition) ⇒ Object
- #get_association_name_for_condition(field) ⇒ Object
-
#get_previous_interval_condition ⇒ Object
NOTICE: Look for a previous interval condition matching the following: - If the filter is a simple condition at the root the check is done right away.
-
#initialize(filters, resource, timezone) ⇒ FiltersParser
constructor
A new instance of FiltersParser.
- #is_belongs_to(field) ⇒ Object
- #parse_aggregation(node) ⇒ Object
- #parse_aggregation_on_previous_interval(node, previous_condition) ⇒ Object
- #parse_aggregation_operator(aggregator_operator) ⇒ Object
- #parse_condition(condition) ⇒ Object
- #parse_field_name(field) ⇒ Object
- #parse_operator(operator) ⇒ Object
- #parse_previous_interval_condition(condition) ⇒ Object
- #parse_value(operator, value) ⇒ Object
- #raise_empty_condition_in_filter_error ⇒ Object
- #raise_unknown_operator_error(operator) ⇒ Object
Constructor Details
#initialize(filters, resource, timezone) ⇒ FiltersParser
Returns a new instance of FiltersParser.
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# File 'app/services/forest_liana/filters_parser.rb', line 5 def initialize(filters, resource, timezone) begin @filters = JSON.parse(filters) rescue JSON::ParserError raise ForestLiana::Errors::HTTP422Error.new('Invalid filters JSON format') end @resource = resource @operator_date_parser = OperatorDateIntervalParser.new(timezone) @joins = [] end |
Instance Method Details
#apply_filters ⇒ Object
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# File 'app/services/forest_liana/filters_parser.rb', line 17 def apply_filters return @resource unless @filters where = parse_aggregation(@filters) return @resource unless where @joins.each do |join| current_resource = @resource.reflect_on_association(join.name).klass current_resource.include(ArelHelpers::Aliases) current_resource.aliased_as(join.name) do |aliased_resource| @resource = @resource.joins(ArelHelpers.join_association(@resource, join.name, Arel::Nodes::OuterJoin, aliases: [aliased_resource])) end end @resource.where(where) end |
#apply_filters_on_previous_interval(previous_condition) ⇒ Object
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# File 'app/services/forest_liana/filters_parser.rb', line 212 def apply_filters_on_previous_interval(previous_condition) # Ressource should have already been joined where = parse_aggregation_on_previous_interval(@filters, previous_condition) @resource.where(where) end |
#ensure_valid_aggregation(node) ⇒ Object
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# File 'app/services/forest_liana/filters_parser.rb', line 257 def ensure_valid_aggregation(node) raise ForestLiana::Errors::HTTP422Error.new('Filters cannot be a raw value') unless node.is_a?(Hash) raise_empty_condition_in_filter_error if node.empty? end |
#ensure_valid_condition(condition) ⇒ Object
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# File 'app/services/forest_liana/filters_parser.rb', line 262 def ensure_valid_condition(condition) raise_empty_condition_in_filter_error if condition.empty? raise ForestLiana::Errors::HTTP422Error.new('Condition cannot be a raw value') unless condition.is_a?(Hash) unless condition['field'].is_a?(String) and condition['operator'].is_a?(String) raise ForestLiana::Errors::HTTP422Error.new('Invalid condition format') end end |
#get_association_name_for_condition(field) ⇒ Object
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# File 'app/services/forest_liana/filters_parser.rb', line 172 def get_association_name_for_condition(field) field, subfield = field.split(':') association = @resource.reflect_on_association(field.to_sym) return nil if association.blank? @joins << association unless @joins.include? association association.name end |
#get_previous_interval_condition ⇒ Object
NOTICE: Look for a previous interval condition matching the following:
- If the filter is a simple condition at the root the check is done right away.
- There can't be a previous interval condition if the aggregator is 'or' (no meaning).
- The condition's operator has to be elligible for a previous interval.
- There can't be two previous interval condition.
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# File 'app/services/forest_liana/filters_parser.rb', line 188 def get_previous_interval_condition current_previous_interval = nil # NOTICE: Leaf condition at root unless @filters['aggregator'] return @filters if @operator_date_parser.has_previous_interval?(@filters['operator']) end if @filters['aggregator'] === 'and' @filters['conditions'].each do |condition| # NOTICE: Nested conditions return nil if condition['aggregator'] if @operator_date_parser.has_previous_interval?(condition['operator']) # NOTICE: There can't be two previous_interval. return nil if current_previous_interval current_previous_interval = condition end end end current_previous_interval end |
#is_belongs_to(field) ⇒ Object
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# File 'app/services/forest_liana/filters_parser.rb', line 168 def is_belongs_to(field) field.include?(':') end |
#parse_aggregation(node) ⇒ Object
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# File 'app/services/forest_liana/filters_parser.rb', line 34 def parse_aggregation(node) ensure_valid_aggregation(node) return parse_condition(node) unless node['aggregator'] conditions = [] node['conditions'].each do |condition| conditions.push(parse_aggregation(condition)) end operator = parse_aggregation_operator(node['aggregator']) conditions.empty? ? nil : "(#{conditions.join(" #{operator} ")})" end |
#parse_aggregation_on_previous_interval(node, previous_condition) ⇒ Object
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# File 'app/services/forest_liana/filters_parser.rb', line 219 def parse_aggregation_on_previous_interval(node, previous_condition) raise_empty_condition_in_filter_error unless node return parse_previous_interval_condition(node) unless node['aggregator'] conditions = [] node['conditions'].each do |condition| if condition == previous_condition conditions.push(parse_previous_interval_condition(condition)) else conditions.push(parse_aggregation(condition)) end end operator = parse_aggregation_operator(node['aggregator']) conditions.empty? ? nil : "(#{conditions.join(" #{operator} ")})" end |
#parse_aggregation_operator(aggregator_operator) ⇒ Object
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# File 'app/services/forest_liana/filters_parser.rb', line 96 def parse_aggregation_operator(aggregator_operator) unless AGGREGATOR_OPERATOR.include?(aggregator_operator) raise_unknown_operator_error(aggregator_operator) end aggregator_operator.upcase end |
#parse_condition(condition) ⇒ Object
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# File 'app/services/forest_liana/filters_parser.rb', line 49 def parse_condition(condition) ensure_valid_condition(condition) operator = condition['operator'] value = condition['value'] field = condition['field'] if @operator_date_parser.is_date_operator?(operator) condition = @operator_date_parser.get_date_filter(operator, value) return "#{parse_field_name(field)} #{condition}" end if is_belongs_to(field) association = field.partition(':').first.to_sym association_field = field.partition(':').last unless @resource.reflect_on_association(association) raise ForestLiana::Errors::HTTP422Error.new("Association '#{association}' not found") end current_resource = @resource.reflect_on_association(association).klass else association_field = field current_resource = @resource end # NOTICE: Set the integer value instead of a string if "enum" type # NOTICE: Rails 3 do not have a defined_enums method if current_resource.respond_to?(:defined_enums) && current_resource.defined_enums.has_key?(association_field) value = current_resource.defined_enums[association_field][value] end parsed_field = parse_field_name(field) parsed_operator = parse_operator(operator) parsed_value = parse_value(operator, value) field_and_operator = "#{parsed_field} #{parsed_operator}" if Rails::VERSION::MAJOR < 5 "#{field_and_operator} #{ActiveRecord::Base.sanitize(parsed_value)}" # NOTICE: sanitize method as been removed in Rails 5.1 and sanitize_sql introduced in Rails 5.2. elsif Rails::VERSION::MAJOR == 5 && Rails::VERSION::MINOR == 1 "#{field_and_operator} #{ActiveRecord::Base.connection.quote(parsed_value)}" else ActiveRecord::Base.sanitize_sql(["#{field_and_operator} ?", parsed_value]) end end |
#parse_field_name(field) ⇒ Object
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# File 'app/services/forest_liana/filters_parser.rb', line 145 def parse_field_name(field) if is_belongs_to(field) current_resource = @resource.reflect_on_association(field.split(':').first.to_sym)&.klass raise ForestLiana::Errors::HTTP422Error.new("Field '#{field}' not found") unless current_resource association = get_association_name_for_condition(field) quoted_table_name = ActiveRecord::Base.connection.quote_column_name(association) quoted_field_name = ActiveRecord::Base.connection.quote_column_name(field.split(':')[1]) else quoted_table_name = @resource.quoted_table_name quoted_field_name = ActiveRecord::Base.connection.quote_column_name(field) current_resource = @resource end column_found = current_resource.columns.find { |column| column.name == field.split(':').last } if column_found.nil? raise ForestLiana::Errors::HTTP422Error.new("Field '#{field}' not found") end "#{quoted_table_name}.#{quoted_field_name}" end |
#parse_operator(operator) ⇒ Object
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# File 'app/services/forest_liana/filters_parser.rb', line 104 def parse_operator(operator) case operator when 'not' 'NOT' when 'greater_than', 'after' '>' when 'less_than', 'before' '<' when 'contains', 'starts_with', 'ends_with' 'LIKE' when 'not_contains' 'NOT LIKE' when 'not_equal' '!=' when 'equal' '=' when 'blank' 'IS' when 'present' 'IS NOT' else raise_unknown_operator_error(operator) end end |
#parse_previous_interval_condition(condition) ⇒ Object
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# File 'app/services/forest_liana/filters_parser.rb', line 238 def parse_previous_interval_condition(condition) raise_empty_condition_in_filter_error unless condition parsed_condition = @operator_date_parser.get_date_filter_for_previous_interval( condition['operator'], condition['value'] ) "#{parse_field_name(condition['field'])} #{parsed_condition}" end |
#parse_value(operator, value) ⇒ Object
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# File 'app/services/forest_liana/filters_parser.rb', line 129 def parse_value(operator, value) case operator when 'not', 'greater_than', 'less_than', 'not_equal', 'equal', 'before', 'after' value when 'contains', 'not_contains' "%#{value}%" when 'starts_with' "#{value}%" when 'ends_with' "%#{value}" when 'present', 'blank' else raise_unknown_operator_error(operator) end end |
#raise_empty_condition_in_filter_error ⇒ Object
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# File 'app/services/forest_liana/filters_parser.rb', line 253 def raise_empty_condition_in_filter_error raise ForestLiana::Errors::HTTP422Error.new('Empty condition in filter') end |
#raise_unknown_operator_error(operator) ⇒ Object
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# File 'app/services/forest_liana/filters_parser.rb', line 249 def raise_unknown_operator_error(operator) raise ForestLiana::Errors::HTTP422Error.new("Unknown provided operator '#{operator}'") end |