class ROM::DynamoDB::Dataset::WhereClause::Clause
Attributes
clauses[R]
Public Class Methods
new(clauses = [])
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# File lib/rom/dynamodb/dataset/where_clause.rb, line 8 def initialize(clauses = []) @clauses = clauses.is_a?(Array) ? clauses : [clauses] end
Public Instance Methods
concat(val)
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# File lib/rom/dynamodb/dataset/where_clause.rb, line 12 def concat(val) @clauses.concat(val.is_a?(Array) ? val : [val]) end
expression_attribute_names()
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# File lib/rom/dynamodb/dataset/where_clause.rb, line 20 def expression_attribute_names clauses.collect(&method(:to_names)).inject(:merge) end
expression_attribute_values()
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# File lib/rom/dynamodb/dataset/where_clause.rb, line 16 def expression_attribute_values clauses.collect(&method(:to_values)).inject(:merge) end
key_condition_expression()
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# File lib/rom/dynamodb/dataset/where_clause.rb, line 24 def key_condition_expression clauses.collect(&method(:to_expression)).join(" AND ") end
to_expression(clause)
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# File lib/rom/dynamodb/dataset/where_clause.rb, line 28 def to_expression(clause) case clause.operand when :between "##{clause.key} BETWEEN :#{clause.key}_a AND :#{clause.key}_b" when :begins_with "begins_with(##{clause.key}, :#{clause.key})" when :== "##{clause.key} = :#{clause.key}" else "##{clause.key} #{clause.operand} :#{clause.key}" end end
to_names(clause)
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# File lib/rom/dynamodb/dataset/where_clause.rb, line 56 def to_names(clause) { "##{clause.key}" => clause.key } end
to_values(clause)
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# File lib/rom/dynamodb/dataset/where_clause.rb, line 41 def to_values(clause) case clause.operand when :between value = clause.val min = value.min.is_a?(Operand) ? value.min.val : value.min max = value.max.is_a?(Operand) ? value.max.val : value.max { ":#{clause.key}_a" => min, ":#{clause.key}_b" => max } else { ":#{clause.key}" => clause.val } end end