Class: Para::ModelFieldParsers::Relations

Inherits:
Base
  • Object
show all
Defined in:
lib/para/model_field_parsers/relations.rb

Instance Attribute Summary

Attributes inherited from Base

#fields_hash, #mappings, #model

Instance Method Summary collapse

Methods inherited from Base

#applicable?, #find_attributes_for_mapping, #initialize, register

Constructor Details

This class inherits a constructor from Para::ModelFieldParsers::Base

Instance Method Details

#parse! ⇒ Object 



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# File 'lib/para/model_field_parsers/relations.rb', line 6

def parse!
  # Catch multi select inputs from form attributes mappings
  find_attributes_for_mapping(:multi_select).each do |attribute|
    fields_hash[attribute] = AttributeField::HasManyField.new(
      model, name: attribute, type: 'has_many', field_type: 'multi_select'
    )
  end

  find_attributes_for_mapping(:nested_many).each do |attribute|
    fields_hash[attribute] = AttributeField::NestedManyField.new(
      model, name: attribute, type: 'has_many', field_type: 'nested_many'
    )
  end

  find_attributes_for_mapping(:nested_one).each do |attribute|
    fields_hash[attribute] = AttributeField::NestedOneField.new(
      model, name: attribute, type: 'has_one', field_type: 'nested_one'
    )
  end

  find_attributes_for_mapping(:selectize).each do |attribute|
    fields_hash[attribute] = AttributeField::BelongsToField.new(
      model, name: attribute, type: 'belongs_to', field_type: 'selectize'
    )
  end

  model.reflections.each do |name, reflection|
    # We ensure that name is a symbol and not a string for 4.2+
    # versions of AR
    # We may find a better solution to handle strings, since our
    # `fields_hash` is already a `HashWithIndifferentAccess`
    name = name.to_sym

    # Do not process component relations
    next if name == :component
    # Do not reprocess attributes that were already catched with
    # attributes mappings above
    next if AttributeField::RelationField == fields_hash[name]

    # Remove foreign key, if existing, from fields
    fields_hash.delete(reflection.foreign_key.to_s)

    # Do not process polymorphic belongs to for now ...
    if reflection.options[:polymorphic] == true
      fields_hash.delete(reflection.foreign_type.to_s)
      next
    end

    if model.nested_attributes_options[name]
      if reflection.collection?
        fields_hash[name] = AttributeField::NestedManyField.new(
          model, name: name, type: 'has_many', field_type: 'nested_many'
        )
      else
        fields_hash[name] = AttributeField::NestedOneField.new(
          model, name: name, type: 'belongs_to', field_type: 'nested_one'
        )
      end
    else
      if reflection.collection?
        remove_counter_cache_column!(name, reflection)

        fields_hash[name] = AttributeField::HasManyField.new(
          model, name: name, type: 'has_many', field_type: 'multi_select'
        )
      elsif !reflection.options[:through]
        fields_hash[name] = AttributeField::BelongsToField.new(
          model, name: name, type: 'belongs_to', field_type: 'selectize'
        )
      end
    end
  end
end

#remove_counter_cache_column!(name, reflection) ⇒ Object

Allows removing counter cache columns from fields from has_many relations, when :inverse_of option is set



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# File 'lib/para/model_field_parsers/relations.rb', line 83

def remove_counter_cache_column!(name, reflection)
  return unless (inverse_relation = reflection.inverse_of)
  return unless (counter_name = inverse_relation.options[:counter_cache])

  counter_name = if String === counter_name
    counter_name
  else
    "#{ name }_count"
  end

  fields_hash.delete(counter_name)
end