Class: OccamsRecord::EagerLoaders::HasOne

Inherits:

Base

• Object
• Base
• OccamsRecord::EagerLoaders::HasOne

Defined in:

lib/occams-record/eager_loaders/has_one.rb

Overview

Eager loader for has_one associations.

Direct Known Subclasses

HasMany

Instance Attribute Summary

Attributes inherited from Base

#eval_block, #name, #use

Instance Method Summary

• #merge!(assoc_rows, rows) ⇒ Object

  Merge the association rows into the given rows.

• #query(rows) { ... } ⇒ Object

  Yield one or more ActiveRecord::Relation objects to a given block.

Methods inherited from Base

#initialize

Constructor Details

This class inherits a constructor from OccamsRecord::EagerLoaders::Base

Instance Method Details

#merge!(assoc_rows, rows) ⇒ Object

Merge the association rows into the given rows.

Parameters:

• assoc_rows (Array<OccamsRecord::Results::Row>) —

  rows loaded from the association

• rows (Array<OccamsRecord::Results::Row>) —

  rows loaded from the main model

# File 'lib/occams-record/eager_loaders/has_one.rb', line 25

def merge!(assoc_rows, rows)
  Merge.new(rows, name).
    single!(assoc_rows, @ref.active_record_primary_key.to_s, @ref.foreign_key.to_s)
end

#query(rows) { ... } ⇒ Object

Yield one or more ActiveRecord::Relation objects to a given block.

Parameters:

• rows (Array<OccamsRecord::Results::Row>) —

  Array of rows used to calculate the query.

Yields:

# File 'lib/occams-record/eager_loaders/has_one.rb', line 11

def query(rows)
  return if rows.empty?
  ids = rows.map { |r| r.send @ref.active_record_primary_key }.compact.uniq
  q = base_scope.where(@ref.foreign_key => ids)
  q.where!(@ref.type => rows[0].class&.model_name) if @ref.options[:as]
  yield q
end