Class: ForestLiana::ResourcesGetter

Inherits:
BaseGetter show all
Defined in:
app/services/forest_liana/resources_getter.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from BaseGetter

#get_collection, #get_resource

Constructor Details

#initialize(resource, params, forest_user) ⇒ ResourcesGetter

Returns a new instance of ResourcesGetter.



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# File 'app/services/forest_liana/resources_getter.rb', line 5

def initialize(resource, params, forest_user)
  @resource = resource
  @params = params
  @user = forest_user
  @count_needs_includes = false
  @collection_name = ForestLiana.name_for(@resource)
  @collection = get_collection(@collection_name)
  @fields_to_serialize = get_fields_to_serialize
  @field_names_requested = field_names_requested
  @segment = get_segment
  compute_includes
  @search_query_builder = SearchQueryBuilder.new(@params, @includes, @collection, @user)

  prepare_query
end

Instance Attribute Details

#includes ⇒ Object (readonly)

Returns the value of attribute includes.



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# File 'app/services/forest_liana/resources_getter.rb', line 3

def includes
  @includes
end

#records_count ⇒ Object (readonly)

Returns the value of attribute records_count.



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# File 'app/services/forest_liana/resources_getter.rb', line 3

def records_count
  @records_count
end

#search_query_builder ⇒ Object (readonly)

Returns the value of attribute search_query_builder.



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# File 'app/services/forest_liana/resources_getter.rb', line 3

def search_query_builder
  @search_query_builder
end

Class Method Details

.get_ids_from_request(params, user) ⇒ Object 



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# File 'app/services/forest_liana/resources_getter.rb', line 21

def self.get_ids_from_request(params, user)
  attributes = params.dig('data', 'attributes')
  return attributes[:ids] if attributes&.fetch(:all_records, false) == false && attributes[:ids]

  attributes = merge_subset_query(attributes)
  resources_getter = initialize_resources_getter(attributes, user)
  ids = fetch_ids(resources_getter)

  filter_excluded_ids(ids, attributes[:all_records_ids_excluded])
end

Instance Method Details

#columns_for_cross_database_association(association_name) ⇒ Object 



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# File 'app/services/forest_liana/resources_getter.rb', line 127

def columns_for_cross_database_association(association_name)
  return [:id] unless @params[:fields].present?

  fields = @params[:fields][association_name.to_s]
  return [:id] unless fields

  base_fields = fields.split(',').map(&:strip).map(&:to_sym) | [:id]

  association = @resource.reflect_on_association(association_name)
  extra_key = association.foreign_key

  # Add the foreign key used for the association to ensure it's available in the preloaded records
  # This is necessary for has_one associations, without it calling record.public_send(foreign_key) would raise a "missing attribute" error
  base_fields << extra_key if association.macro == :has_one

  base_fields.uniq
end

#compute_includes ⇒ Object 



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# File 'app/services/forest_liana/resources_getter.rb', line 145

def compute_includes
  associations_has_one = ForestLiana::QueryHelper.get_one_associations(@resource)
  @optional_includes = []
  if @field_names_requested
    includes = associations_has_one.map do |association|
      association_name = association.name.to_s

      if @params[:fields].key?(association_name) &&
        @params[:fields][association_name].split(',').size == 1 &&
        @params[:fields][association_name].split(',').include?(association.klass.primary_key)

        @field_names_requested << association.foreign_key
        @optional_includes << association.name
      end

      association.name
    end

    includes_for_smart_search = []
    if @collection && @collection.search_fields
      includes_for_smart_search = @collection.search_fields
                                             .select { |field| field.include? '.' }
                                             .map { |field| field.split('.').first.to_sym }

      includes_has_many = SchemaUtils.many_associations(@resource)
                                     .select { |association| SchemaUtils.model_included?(association.klass) }
                                     .map(&:name)

      includes_for_smart_search = includes_for_smart_search & includes_has_many
    end

    @includes = (includes & @field_names_requested).concat(includes_for_smart_search)
  else
    @includes = associations_has_one.map(&:name)
  end
end

#count ⇒ Object 



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# File 'app/services/forest_liana/resources_getter.rb', line 49

def count
  @records_count = @count_needs_includes ? optimized_count : @records.count
end

#includes_for_serialization ⇒ Object 



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# File 'app/services/forest_liana/resources_getter.rb', line 182

def includes_for_serialization
  super & @fields_to_serialize.map(&:to_s)
end

#perform ⇒ Object 



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# File 'app/services/forest_liana/resources_getter.rb', line 32

def perform
  polymorphic_association, preload_loads = analyze_associations(@resource)
  includes = @includes.uniq - polymorphic_association - preload_loads - @optional_includes
  has_smart_fields =  @params[:fields][@collection_name].split(',').any? do |field|
    ForestLiana::SchemaHelper.is_smart_field?(@resource, field)
  end

  if includes.empty? || has_smart_fields
    @records = optimize_record_loading(@resource, @records, false)
  else
    select = compute_select_fields
    @records = optimize_record_loading(@resource, @records, false).references(includes).select(*select)
  end

  @records
end

#preload_cross_database_associations(records, preload_loads) ⇒ Object 



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# File 'app/services/forest_liana/resources_getter.rb', line 82

def preload_cross_database_associations(records, preload_loads)
  preload_loads.each do |association_name|
    association = @resource.reflect_on_association(association_name)
    next unless separate_database?(@resource, association)

    columns = columns_for_cross_database_association(association_name)

    if association.macro == :belongs_to
      foreign_key = association.foreign_key
      primary_key = association.klass.primary_key

      ids = records.map { |r| r.public_send(foreign_key) }.compact.uniq
      next if ids.empty?

      associated = association.klass.where(primary_key => ids)
                              .select(columns)
                              .index_by { |record| record.public_send(primary_key) }

      records.each do |record|
        record.define_singleton_method(association_name) do
          associated[record.send(foreign_key.to_sym)] || nil
        end
      end
    end

    if association.macro == :has_one
      foreign_key = association.foreign_key
      primary_key = association.active_record_primary_key

      ids = records.map { |r| r.public_send(primary_key) }.compact.uniq
      next if ids.empty?

      associated = association.klass.where(foreign_key => ids)
                              .select(columns)
                              .index_by { |record| record.public_send(foreign_key.to_sym) }

      records.each do |record|
        record.define_singleton_method(association_name) do
          associated[record.send(primary_key.to_sym)] || nil
        end
      end
    end
  end
end

#query_for_batch ⇒ Object 



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# File 'app/services/forest_liana/resources_getter.rb', line 53

def query_for_batch
  @records
end

#records ⇒ Object 



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# File 'app/services/forest_liana/resources_getter.rb', line 57

def records
  records = @records.offset(offset).limit(limit).to_a
  polymorphic_association, preload_loads = analyze_associations(@resource)

  if polymorphic_association && Rails::VERSION::MAJOR >= 7
    preloader = ActiveRecord::Associations::Preloader.new(records: records, associations: polymorphic_association)
    preloader.loaders
    preloader.branches.each do |branch|
      branch.loaders.each do |loader|
        records_by_owner = loader.records_by_owner
        records_by_owner.each do |record, association|
          record_index =  records.find_index { |r| r.id == record.id }
          records[record_index].define_singleton_method(branch.association) do
            association.first
          end
        end
      end
    end
  end

  preload_cross_database_associations(records, preload_loads)

  records
end