Class: ActiveRecord::Relation

Inherits:
Object
  • Object
show all
Defined in:
lib/jun/active_record/relation.rb

Instance Method Summary collapse

Constructor Details

#initialize(klass) ⇒ Relation

Returns a new instance of Relation.



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# File 'lib/jun/active_record/relation.rb', line 5

def initialize(klass)
  @klass = klass
  @where_clauses = []
end

Instance Method Details

#each(&block) ⇒ Object 



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# File 'lib/jun/active_record/relation.rb', line 38

def each(&block)
  records.each(&block)
end

#first ⇒ Object 



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# File 'lib/jun/active_record/relation.rb', line 34

def first
  records.first
end

#records ⇒ Object Also known as: to_a 



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# File 'lib/jun/active_record/relation.rb', line 28

def records
  @records ||= @klass.find_by_sql(to_sql)
end

#to_sql ⇒ Object 



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# File 'lib/jun/active_record/relation.rb', line 21

def to_sql
  sql = "SELECT * FROM #{@klass.table_name}"
  sql += " WHERE #{@where_clauses.join(" AND ")}" if @where_clauses.any?

  sql
end

#where(condition) ⇒ Object 



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# File 'lib/jun/active_record/relation.rb', line 17

def where(condition)
  clone.where!(condition)
end

#where!(condition) ⇒ Object 



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# File 'lib/jun/active_record/relation.rb', line 10

def where!(condition)
  clause = condition.is_a?(String) ? condition : condition.map { |k, v| "#{k} = #{v}" }.join(" AND ")
  @where_clauses << clause

  self
end