Class: Dynomite::Item::Query::Params::Filter

Inherits:
Base
  • Object
show all
Defined in:
lib/dynomite/item/query/params/filter.rb

Constant Summary

Constants included from Types

Types::TYPE_MAP

Instance Method Summary collapse

Methods inherited from Base

#expression_string, #function_names, #join_expressions

Methods included from Helpers

#all_where_field_names, #all_where_fields, #disable_index_for_any_or?, #disable_index_for_consistent_read?, #disable_index_for_not?, #normalize_expression_path, #normalize_project_expression, #query, #scan_required?, #with_where_groups

Methods included from Types

#type_map

Constructor Details

#initialize(relation, index) ⇒ Filter

Returns a new instance of Filter.



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# File 'lib/dynomite/item/query/params/filter.rb', line 3

def initialize(relation, index)
  @relation, @index = relation, index
  @expressions = []
end

Instance Method Details

#build ⇒ Object 



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# File 'lib/dynomite/item/query/params/filter.rb', line 8

def build
  build_where
  build_functions
end

#build_functions ⇒ Object

docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.OperatorsAndFunctions.html



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# File 'lib/dynomite/item/query/params/filter.rb', line 29

def build_functions
  # Essentially
  #    @expressions += Function::AttributeExists.new(@query).filter_expression
  #    @expressions += Function::AttributeType.new(@query).filter_expression
  #    @expressions += Function::BeginsWith.new(@query).filter_expression
  function_names.each do |function_name|
    function = Function.const_get(function_name.camelize).new(@relation.query)
    filter_expression = function.filter_expression
    @expressions += filter_expression
  end
end

#build_where ⇒ Object 



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# File 'lib/dynomite/item/query/params/filter.rb', line 19

def build_where
  with_where_groups do |where_group|
    expression = where_group.build_compare_expression_if do |field|
      @index.nil? || !@index.fields.include?(field)
    end
    @expressions << expression if expression
  end
end

#expression ⇒ Object 



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# File 'lib/dynomite/item/query/params/filter.rb', line 14

def expression
  build
  join_expressions
end