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) ⇒ ResourcesGetter

Returns a new instance of ResourcesGetter.



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# File 'app/services/forest_liana/resources_getter.rb', line 7

def initialize(resource, params)
  @resource = resource
  @params = params
  @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
  get_segment
  compute_includes
  @search_query_builder = SearchQueryBuilder.new(@params, @includes, @collection)

  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 4

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 5

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) ⇒ Object 



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# File 'app/services/forest_liana/resources_getter.rb', line 22

def self.get_ids_from_request(params)
  attributes = params.dig('data', 'attributes')
  has_body_attributes = attributes != nil
  is_select_all_records_query = has_body_attributes && attributes[:all_records] == true

  # NOTICE: If it is not a "select all records" query and it receives a list of ID, return list of ID.
  return attributes[:ids] if (!is_select_all_records_query && attributes[:ids])

  # NOTICE: If it is a "select all records" we have to perform query to build ID list.
  ids = Array.new

  # NOTICE: Merging all_records_subset_query into attributes preserves filters in HasManyGetter and ResourcesGetter.
  attributes = attributes.merge(attributes[:all_records_subset_query].dup.to_unsafe_h)

  # NOTICE: Initialize actual resources getter (could either a HasManyGetter or a ResourcesGetter).
  is_related_data = attributes[:parent_collection_id] &&
    attributes[:parent_collection_name] &&
    attributes[:parent_association_name]
  if is_related_data
    parent_collection_name = attributes[:parent_collection_name]
    parent_model = ForestLiana::SchemaUtils.find_model_from_collection_name(parent_collection_name)
    model = parent_model.reflect_on_association(attributes[:parent_association_name].try(:to_sym))
    resources_getter = ForestLiana::HasManyGetter.new(parent_model, model, attributes.merge({
      collection: parent_collection_name,
      id: attributes[:parent_collection_id],
      association_name: attributes[:parent_association_name],
    }))
  else
    collection_name = attributes[:collection_name]
    model = ForestLiana::SchemaUtils.find_model_from_collection_name(collection_name)
    resources_getter = ForestLiana::ResourcesGetter.new(model, attributes)
  end

  # NOTICE: build IDs list.
  resources_getter.query_for_batch.find_in_batches() do |records|
    ids += records.map { |record| record.id }
  end

  # NOTICE: remove excluded IDs.
  ids_excluded = (attributes[:all_records_ids_excluded]).map { |id_excluded| id_excluded.to_s }
  return ids.select { |id| !ids_excluded.include? id.to_s } if (ids_excluded && ids_excluded.any?)

  return ids
end

Instance Method Details

#compute_includes ⇒ Object 



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# File 'app/services/forest_liana/resources_getter.rb', line 85

def compute_includes
  associations_has_one = ForestLiana::QueryHelper.get_one_associations(@resource)

  includes = associations_has_one.map(&:name)
  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

  if @field_names_requested
    @includes = (includes & @field_names_requested).concat(includes_for_smart_search)
  else
    @includes = includes
  end
end

#count ⇒ Object 



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# File 'app/services/forest_liana/resources_getter.rb', line 71

def count
  # NOTICE: For performance reasons, do not eager load the data if there is  no search or
  #         filters on associations.
  @records_count = @count_needs_includes ? @records.eager_load(@includes).count : @records.count
end

#includes_for_serialization ⇒ Object 



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# File 'app/services/forest_liana/resources_getter.rb', line 110

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 67

def perform
  @records = @records.eager_load(@includes)
end

#query_for_batch ⇒ Object 



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# File 'app/services/forest_liana/resources_getter.rb', line 77

def query_for_batch
  @records
end

#records ⇒ Object 



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# File 'app/services/forest_liana/resources_getter.rb', line 81

def records
  @records.offset(offset).limit(limit).to_a
end