Module: CompositePrimaryKeys::ActiveRecord::FinderMethods

Defined in:
lib/composite_primary_keys/relation/finder_methods.rb

Instance Method Summary collapse

Instance Method Details

#apply_join_dependency(relation, join_dependency) ⇒ Object 



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# File 'lib/composite_primary_keys/relation/finder_methods.rb', line 4

def apply_join_dependency(relation, join_dependency)
  relation = relation.except(:includes, :eager_load, :preload)
  relation = relation.joins join_dependency

  if using_limitable_reflections?(join_dependency.reflections)
    relation
  else
    if relation.limit_value
      limited_ids = limited_ids_for(relation)
      # CPK
      #limited_ids.empty? ? relation.none! : relation.where!(table[primary_key].in(limited_ids))
      limited_ids.empty? ? relation.none! : relation.where!(cpk_in_predicate(table, self.primary_keys, limited_ids))
    end
    relation.except(:limit, :offset)
  end
end

#exists?(conditions = :none) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/composite_primary_keys/relation/finder_methods.rb', line 39

def exists?(conditions = :none)
  # conditions can be:
  #   Array - ['department_id = ? and location_id = ?', 1, 1]
  #   Array -> [1,2]
  #   CompositeKeys -> [1,2]

  conditions = conditions.id if ::ActiveRecord::Base === conditions
  return false if !conditions

  relation = apply_join_dependency(self, construct_join_dependency)
  return false if ::ActiveRecord::NullRelation === relation

  relation = relation.except(:select, :order).select(::ActiveRecord::FinderMethods::ONE_AS_ONE).limit(1)

  # CPK
  #case conditions
  #when Array, Hash
  #  relation = relation.where(conditions)
  #else
  #  relation = relation.where(table[primary_key].eq(conditions)) if conditions != :none
  #end

  case conditions
  when CompositePrimaryKeys::CompositeKeys
    relation = relation.where(cpk_id_predicate(table, primary_key, conditions))
  when Array
    pk_length = @klass.primary_keys.length

    if conditions.length == pk_length # E.g. conditions = ['France', 'Paris']
      return self.exists?(conditions.to_composite_keys)
    else # Assume that conditions contains where relation
      relation = relation.where(conditions)
    end
  when Hash
    relation = relation.where(conditions)
  end

  connection.select_value(relation, "#{name} Exists", relation.bind_values) ? true : false
end

#find_one(id) ⇒ Object 



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# File 'lib/composite_primary_keys/relation/finder_methods.rb', line 102

def find_one(id)
  # CPK
  #id = id.id if ActiveRecord::Base === id
  id = id.id if ::ActiveRecord::Base === id

  # CPK
  #column = columns_hash[primary_key]
  #substitute = connection.substitute_at(column, bind_values.length)
  #relation = where(table[primary_key].eq(substitute))
  #relation.bind_values += [[column, id]]
  #record = relation.take
  relation = self
  values = primary_keys.each_with_index.map do |primary_key, i|
    column = columns_hash[primary_key]
    relation.bind_values += [[column, id[i]]]
    connection.substitute_at(column, bind_values.length - 1)
  end
  relation = relation.where(cpk_id_predicate(table, primary_keys, values))

  record = relation.take
  raise_record_not_found_exception!(id, 0, 1) unless record
  record
end

#find_some(ids) ⇒ Object 



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# File 'lib/composite_primary_keys/relation/finder_methods.rb', line 126

def find_some(ids)
  # CPK
  # result = where(table[primary_key].in(ids)).to_a

  result = ids.map do |cpk_ids|
    cpk_ids = if cpk_ids.length == 1
      cpk_ids.first.split(CompositePrimaryKeys::ID_SEP).to_composite_keys
    else
      cpk_ids.to_composite_keys
    end

    unless cpk_ids.length == @klass.primary_keys.length
      raise "#{cpk_ids.inspect}: Incorrect number of primary keys for #{@klass.name}: #{@klass.primary_keys.inspect}"
    end

    new_relation = clone
    [@klass.primary_keys, cpk_ids].transpose.map do |key, id|
      new_relation = new_relation.where(key => id)
    end

    records = new_relation.to_a

    if records.empty?
      conditions = new_relation.arel.where_sql
      raise(::ActiveRecord::RecordNotFound,
            "Couldn't find #{@klass.name} with ID=#{cpk_ids} #{conditions}")
    end
    records
  end.flatten

  expected_size =
    if limit_value && ids.size > limit_value
      limit_value
    else
      ids.size
    end

  # 11 ids with limit 3, offset 9 should give 2 results.
  if offset_value && (ids.size - offset_value < expected_size)
    expected_size = ids.size - offset_value
  end

  if result.size == expected_size
    result
  else
    raise_record_not_found_exception!(ids, result.size, expected_size)
  end
end

#find_with_ids(*ids) ⇒ Object

Raises:

  • (UnknownPrimaryKey) 


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# File 'lib/composite_primary_keys/relation/finder_methods.rb', line 79

def find_with_ids(*ids)
  # CPK handle strings that come w/ calling to_param on CPK-enabled models
  ids = parse_ids(ids)
  raise UnknownPrimaryKey.new(@klass) if primary_key.nil?

  expects_array = ids.first.kind_of?(Array)
  return ids.first if expects_array && ids.first.empty?

  # CPK - don't do this, we want an array of arrays
  #ids = ids.flatten.compact.uniq
  case ids.size
    when 0
      raise RecordNotFound, "Couldn't find #{@klass.name} without an ID"
    when 1
      result = find_one(ids.first)
      # CPK
      # expects_array ? [ result ] : result
      result
    else
      find_some(ids)
  end
end

#limited_ids_for(relation) ⇒ Object 



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# File 'lib/composite_primary_keys/relation/finder_methods.rb', line 21

def limited_ids_for(relation)
  # CPK
  #values = @klass.connection.columns_for_distinct(
  #  "#{quoted_table_name}.#{quoted_primary_key}", relation.order_values)
  columns = @klass.primary_keys.map do |key|
    "#{quoted_table_name}.#{connection.quote_column_name(key)}"
  end
  values = @klass.connection.columns_for_distinct(columns, relation.order_values)

  relation = relation.except(:select).select(values).distinct!

  id_rows = @klass.connection.select_all(relation.arel, 'SQL', relation.bind_values)

  # CPK
  #id_rows.map {|row| row[primary_key]}
  id_rows.map {|row| row.values}
end