Class: SvelteOnRails::Lib::ToSvelteValues

Inherits:
Object
  • Object
show all
Defined in:
lib/svelte_on_rails/lib/to_svelte_values.rb

Class Method Summary collapse

Class Method Details

.active_record_collection?(obj) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/svelte_on_rails/lib/to_svelte_values.rb', line 119

def self.active_record_collection?(obj)
  (obj.is_a?(ActiveRecord::Relation) ||
    obj.is_a?(ActiveRecord::Associations::CollectionProxy)) rescue false
end

.apply_pagination(coll, associations) ⇒ Object 



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# File 'lib/svelte_on_rails/lib/to_svelte_values.rb', line 25

def self.apply_pagination(coll, associations)
  if associations.key?(:offset) || associations.key?(:limit)
    if active_record_collection?(coll)
      scope = coll
      scope = scope.offset(associations[:offset]) if associations.key?(:offset)
      scope = scope.limit(associations[:limit]) if associations.key?(:limit)
      scope.to_a
    elsif coll.respond_to?(:drop) && coll.respond_to?(:take)
      res = coll
      res = res.drop(associations[:offset]) if associations.key?(:offset)
      res = res.take(associations[:limit]) if associations.key?(:limit)
      res
    else
      raise "[SOR] to_svelte Cannot paginate #{coll.class}"
    end
  else
    coll.respond_to?(:to_a) ? coll.to_a : coll
  end
end

.collection_like?(obj) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/svelte_on_rails/lib/to_svelte_values.rb', line 115

def self.collection_like?(obj)
  looks_like_collection?(obj) || obj.is_a?(Array)
end

.extract_single_record(record, attributes, associations, next_stack) ⇒ Object 



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# File 'lib/svelte_on_rails/lib/to_svelte_values.rb', line 57

def self.extract_single_record(record, attributes, associations, next_stack)
  return {} unless record # or raise – depending on your preference

  values = {}

  enums = record.class.try(:defined_enums) || {}

  attributes.each do |attr|
    validate_attribute!(record, attr)

    key_s = attr.to_s
    attr_key = key_s.camelize(:lower)
    value = record.send(attr)

    values[attr_key] = enums.key?(key_s) ? record.send(key_s) : value
  end

  associations.each do |key, val|
    key_s = key.to_s
    attr_key = key_s.camelize(:lower)
    next if %w[offset limit].include?(key_s)

    reflection = record.class.reflect_on_association(key_s)
    raise ArgumentError, "No association #{key_s.inspect} on #{record.class}" unless reflection

    related = record.send(key_s)

    if related.respond_to?(:each) && related.empty?
      values[attr_key] = []
    elsif !related
      values[attr_key] = nil
    else

      sub_attrs, sub_assocs = SvelteOnRails::Lib::ToSvelteSupport.separate_associations(val)

      values[attr_key] = extract_values_recursive(
        related,
        sub_attrs,
        sub_assocs,
        call_stack: next_stack
      )
    end
  end

  values
end

.extract_values(record, attributes = [], associations = {}) ⇒ Object

Public API – returns Hash for single record, Array<Hash> for collections



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# File 'lib/svelte_on_rails/lib/to_svelte_values.rb', line 5

def self.extract_values(record, attributes = [], associations = {})

  records = normalize_to_enumerable(record, associations)

  result = extract_values_recursive(records, attributes, associations, call_stack: 0)

  # Mirror input shape for the top-level return value
  looks_like_single?(record) ? (result.first || {}) : result
end

.extract_values_recursive(thing, attributes, associations, call_stack:) ⇒ Object 



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# File 'lib/svelte_on_rails/lib/to_svelte_values.rb', line 45

def self.extract_values_recursive(thing, attributes, associations, call_stack:)
  next_stack = call_stack + 1

  if collection_like?(thing)
    thing.map do |record|
      extract_single_record(record, attributes, associations, next_stack)
    end
  else
    extract_single_record(thing, attributes, associations, next_stack)
  end
end

.looks_like_collection?(obj) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/svelte_on_rails/lib/to_svelte_values.rb', line 110

def self.looks_like_collection?(obj)
  return false if obj.nil? || obj.is_a?(Hash) || obj.is_a?(String)
  obj.respond_to?(:each)
end

.looks_like_single?(obj) ⇒ Boolean

Helpers ────────────────────────────────────────────────

Returns:

  • (Boolean) 


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# File 'lib/svelte_on_rails/lib/to_svelte_values.rb', line 106

def self.looks_like_single?(obj)
  !looks_like_collection?(obj)
end

.normalize_to_enumerable(record, associations) ⇒ Object 



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# File 'lib/svelte_on_rails/lib/to_svelte_values.rb', line 17

def self.normalize_to_enumerable(record, associations)
  if looks_like_collection?(record)
    apply_pagination(record, associations)
  else
    [record] # single → wrap → recursive code can be uniform
  end
end

.validate_attribute!(record, attr) ⇒ Object 



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# File 'lib/svelte_on_rails/lib/to_svelte_values.rb', line 124

def self.validate_attribute!(record, attr)
  unless attr.is_a?(Symbol) || attr.is_a?(String)
    raise ArgumentError, "Attribute must be Symbol or String, got #{attr.inspect}"
  end
  unless record.respond_to?(attr)
    raise "[SOR] to_svelte: No method #{attr.inspect} on #{record.class}"
  end
end