Module: DeepUnrest::Write

Defined in:
lib/deep_unrest/write.rb

Class Method Summary collapse

Class Method Details

.addr_to_lodash_path(path_arr) ⇒ Object 



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# File 'lib/deep_unrest/write.rb', line 170

def self.addr_to_lodash_path(path_arr)
  lodash_path = []
  until path_arr.empty?
    segment = path_arr.shift
    if segment.match(/\[\]$/)
      idx = path_arr.shift
      segment = "#{segment.gsub('[]', '')}[#{idx}]"
    end
    lodash_path << segment
  end
  lodash_path.join('.')
end

.append_ar_paths(mappings) ⇒ Object 



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# File 'lib/deep_unrest/write.rb', line 48

def self.append_ar_paths(mappings)
  mappings.each do |item|
    item[:ar_addr] = []
    addr = [*item[:addr]]
    until addr.empty?
      segment = addr.shift
      item[:ar_addr] << segment if item[:ar_addr].empty?
      next unless segment == :include

      next_segment = "#{addr.shift.underscore}_attributes"
      addr.shift if addr[0].to_s == 'data[]'
      idx = addr.shift if addr[0].is_a? Integer
      next_segment += '[]' if idx
      item[:ar_addr] << next_segment
      item[:ar_addr] << idx if idx
    end
  end
end

.authorize_attributes(mappings, ctx) ⇒ Object

Raises:



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# File 'lib/deep_unrest/write.rb', line 67

def self.authorize_attributes(mappings, ctx)
  unauthorized_items = []

  mappings.reject { |m| m[:scope_type] == :show }
          .reject { |m| m[:destroy] }
          .each do |item|
    attributes = item.dig(:query, :attributes) || {}
    resource = item[:resource]
    p = JSONAPI::RequestParser.new
    p.resource_klass = resource
    opts = if item[:scope_type] == :create
             resource.creatable_fields(ctx)
           else
             resource.updatable_fields(ctx)
           end

    p.parse_params({ attributes: attributes }, opts)[:attributes]
  rescue JSONAPI::Exceptions::ParameterNotAllowed
    unpermitted_keys = attributes.keys.map(&:to_sym) - opts
    item[:errors] = unpermitted_keys.each_with_object({}) do |attr_key, memo|
      memo[attr_key] = 'Unpermitted parameter'
    end
    unauthorized_items << item
  end

  return if unauthorized_items.blank?

  msg = serialize_errors(unauthorized_items)
  raise DeepUnrest::UnpermittedParams, msg
end

.build_mutation_bodies(mappings) ⇒ Object 



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# File 'lib/deep_unrest/write.rb', line 98

def self.build_mutation_bodies(mappings)
  mappings.each_with_object({}) do |item, memo|
    # TODO: use pkey instead of "id"
    next_attrs = (item.dig(:query, :attributes) || {})
                 .deep_symbolize_keys
    update_body = { id: item.dig(:query, :id),
                    deep_unrest_query_uuid: item.dig(:query, :uuid),
                    **DeepUnrest.deep_underscore_keys(next_attrs) }
    update_body[:_destroy] = true if item[:scope_type] == :destroy
    DeepUnrest.set_attr(memo, item[:ar_addr].clone, update_body)
    if item[:ar_addr].size == 1
      item[:mutate] = memo.fetch(*item[:ar_addr])
      item[:scope_type] = :update if item[:scope_type] == :show
    end
  end
end

.create_mapping_sequence(k, v, addr) ⇒ Object 



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# File 'lib/deep_unrest/write.rb', line 30

def self.create_mapping_sequence(k, v, addr)
  v[:data].each_with_index.map do |item, idx|
    create_write_mapping(k, item, addr, idx)
  end
end

.create_write_mapping(k, v, addr, idx = nil) ⇒ Object 



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# File 'lib/deep_unrest/write.rb', line 13

def self.create_write_mapping(k, v, addr, idx = nil)
  path = k
  resource_addr = [*addr, path]
  resource_addr += ['data[]', idx] if idx
  uuid = SecureRandom.uuid
  v[:uuid] = uuid
  [{ klass: k.singularize.classify.constantize,
     policy: "#{k.singularize.classify}Policy".constantize,
     resource: "#{k.singularize.classify}Resource".constantize,
     scope_type: get_scope_type(v),
     addr: resource_addr,
     key: k.camelize(:lower),
     uuid: uuid,
     query: v },
   *create_write_mappings(v[:include], [*resource_addr, :include])]
end

.create_write_mappings(params, addr = []) ⇒ Object 



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# File 'lib/deep_unrest/write.rb', line 36

def self.create_write_mappings(params, addr = [])
  return unless params

  params.map do |k, v|
    if v[:data] && v[:data].is_a?(Array)
      create_mapping_sequence(k, v, addr)
    else
      create_write_mapping(k, v, addr)
    end
  end.flatten.compact
end

.execute_queries(mappings, context) ⇒ Object 



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# File 'lib/deep_unrest/write.rb', line 115

def self.execute_queries(mappings, context)
  ActiveRecord::Base.transaction do
    mappings.select { |m| m[:mutate] }.map do |item|
      record = case item[:scope_type]
               when :update
                 model = item[:klass].find(item.dig(:query, :id))
                 model.assign_attributes(item[:mutate])
                 resource = item[:resource].new(model, context)
                 resource.run_callbacks :save do
                   resource.run_callbacks :update do
                     model.save
                     model
                   end
                 end
               when :create
                 model = item[:klass].new(item[:mutate])
                 resource = item[:resource].new(model, context)
                 resource.run_callbacks :save do
                   resource.run_callbacks :create do
                     resource._model.save
                     resource._model
                   end
                 end
               when :destroy
                 model = item[:klass].find(id)
                 resource = item[:resource].new(model, context)
                 resource.run_callbacks :remove do
                   item[:klass].destroy(id)
                 end
               end

      item[:record] = record
      result = { record: record }
      if item[:temp_id]
        result[:temp_ids] = {}
        result[:temp_ids][item[:temp_id]] = record.id
      end
      result
    end
  end
end

.format_ar_error_path(base, ar_path) ⇒ Object 



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# File 'lib/deep_unrest/write.rb', line 203

def self.format_ar_error_path(base, ar_path)
  path_arr = ar_path.gsub(/\.(?!\w+$)/, '.include.')
                    .gsub(/\.(?=\w+$)/, '.attributes.\1')
                    .gsub(/\[(\d+)\]/, '.data[].\1')
                    .split('.')

  if path_arr.size == 1
    path_arr.unshift('attributes')
  elsif path_arr.size > 1
    path_arr.unshift('include')
  end

  [*base, *path_arr]
end

.get_scope_type(item) ⇒ Object 



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# File 'lib/deep_unrest/write.rb', line 5

def self.get_scope_type(item)
  return :destroy if item[:destroy]
  return :show if item[:readOnly] || item[:attributes].blank?
  return :create if item[:id] && DeepUnrest.temp_id?(item[:id].to_s)

  :update
end

.map_ar_errors_to_param_keys(mappings) ⇒ Object 



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# File 'lib/deep_unrest/write.rb', line 218

def self.map_ar_errors_to_param_keys(mappings)
  mappings
    .each_with_object({}) do |item, memo|
      item[:record]&.errors&.messages&.each do |ar_path, msg|
        err_path = format_ar_error_path(item[:addr], ar_path.to_s)
        DeepUnrest.set_attr(memo, err_path, msg)
      end
    end
end

.serialize_changes(ctx, mappings, changed) ⇒ Object 



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# File 'lib/deep_unrest/write.rb', line 157

def self.serialize_changes(ctx, mappings, changed)
  changed.select { |c| c[:query_uuid] }
         .each_with_object({}) do |c, memo|
           mapping = mappings.find { |m| m.dig(:query, :uuid) == c[:query_uuid] }
           next unless mapping
           mapping[:query][:fields] = c[:attributes].keys
           mapping[:record] = c[:klass].new(id: c[:id])
           mapping[:record].assign_attributes(c[:attributes])
           result = DeepUnrest.serialize_result(ctx, mapping)
           DeepUnrest.set_attr(memo, mapping[:addr], result)
         end
end

.serialize_destroyed(_ctx, mappings, destroyed) ⇒ Object 



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# File 'lib/deep_unrest/write.rb', line 183

def self.serialize_destroyed(_ctx, mappings, destroyed)
  destroyed.select { |d| d[:query_uuid] }
           .map do |d|
    mapping = mappings.find { |m| m.dig(:query, :uuid) == d[:query_uuid] }
    lodash_path = addr_to_lodash_path(mapping[:addr])
    { id: d[:id], path: lodash_path, type: mapping[:key].pluralize }
  end
end

.serialize_errors(mappings) ⇒ Object 



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# File 'lib/deep_unrest/write.rb', line 192

def self.serialize_errors(mappings)
  { errors: mappings.each_with_object({}) do |item, memo|
    err = {
      id: item.dig(:query, :id),
      type: item.dig(:query, :type),
      attributes: item[:errors,]
    }
    DeepUnrest.set_attr(memo, [*item[:addr]], err)
  end }.to_json
end

.write(ctx, params, user) ⇒ Object

Raises:



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# File 'lib/deep_unrest/write.rb', line 228

def self.write(ctx, params, user)
  temp_id_map = DeepUnrest::ApplicationController.class_variable_get(
    '@@temp_ids'
  )
  temp_id_map[ctx[:uuid]] ||= {}

  # create mappings for assembly / disassembly
  mappings = create_write_mappings(params.to_unsafe_h)

  # authorize user for requested scope(s)
  DeepUnrest.authorization_strategy.authorize(mappings, user)

  authorize_attributes(mappings, ctx)

  # collect authorized scopes
  # DeepUnrest.collect_authorized_scopes(mappings, user)
  append_ar_paths(mappings)

  # bulid update arguments
  build_mutation_bodies(mappings)

  # convert temp_ids from ids to non-activerecord attributes
  DeepUnrest.convert_temp_ids!(ctx[:uuid], mappings.select { |m| m[:mutate] })

  # save data, run callbaks
  results = execute_queries(mappings, ctx)

  # check results for errors
  errors = results.map { |res| DeepUnrest.format_error_keys(res) }
                  .compact
                  .reject(&:empty?)
                  .compact

  if errors.empty?
    destroyed = DeepUnrest::ApplicationController.class_variable_get(
      '@@destroyed_entities'
    )

    changed = DeepUnrest::ApplicationController.class_variable_get(
      '@@changed_entities'
    )

    return {
      temp_ids: temp_id_map[ctx[:uuid]],
      destroyed: serialize_destroyed(ctx, mappings, destroyed),
      changed: serialize_changes(ctx, mappings, changed)
    }
  end

  # map errors to their sources
  formatted_errors = { errors: map_ar_errors_to_param_keys(mappings) }

  # raise error if there are any errors
  raise DeepUnrest::Conflict, formatted_errors.to_json
end