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one query per table

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simon lehericey 2021-04-22 22:27:38 +02:00
parent 20fb756097
commit 5cfb4114ce
1 changed files with 33 additions and 37 deletions
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70
app/services/dossier_projection_service.rb
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@ -18,57 +18,53 @@ class DossierProjectionService
# - the order of the intermediary query results are unknown
# - some values can be missing (if a revision added or removed them)
def self.project(dossiers_ids, fields)
champ_fields, other_fields = fields
.partition { |f| ['type_de_champ', 'type_de_champ_private'].include?(f[TABLE]) }
if champ_fields.present?
Champ
.includes(:type_de_champ)
.where(
# as querying the champs table is costly
# we fetch all the requested champs at once
types_de_champ: { stable_id: champ_fields.map { |f| f[COLUMN] } },
dossier_id: dossiers_ids
)
.select(:dossier_id, :value, :type_de_champ_id, :stable_id) # we cannot pluck :value, as we need the champ.to_s method
.group_by(&:stable_id) # the champs are redispatched to their respective fields
.map do |stable_id, champs|
field = champ_fields.find { |f| f[COLUMN] == stable_id.to_s }
field[:id_value_h] = champs.to_h { |c| [c.dossier_id, c.to_s] }
end
end
other_fields.each do |field|
field[:id_value_h] = case field[TABLE]
fields
.each { |f| f[:id_value_h] = {} }
.group_by { |f| f[TABLE] } # one query per table
.each do |table, fields|
case table
when 'type_de_champ', 'type_de_champ_private'
Champ
.includes(:type_de_champ)
.where(
types_de_champ: { stable_id: fields.map { |f| f[COLUMN] } },
dossier_id: dossiers_ids
)
.select(:dossier_id, :value, :type_de_champ_id, :stable_id) # we cannot pluck :value, as we need the champ.to_s method
.group_by(&:stable_id) # the champs are redispatched to their respective fields
.map do |stable_id, champs|
field = fields.find { |f| f[COLUMN] == stable_id.to_s }
field[:id_value_h] = champs.to_h { |c| [c.dossier_id, c.to_s] }
end
when 'self'
Dossier
.where(id: dossiers_ids)
.pluck(:id, field[COLUMN].to_sym)
.to_h { |id, col| [id, col&.strftime('%d/%m/%Y')] }
.pluck(:id, *fields.map { |f| f[COLUMN].to_sym })
.each { |id, *columns| fields.zip(columns).each { |field, value| field[:id_value_h][id] = value&.strftime('%d/%m/%Y') } }
when 'individual'
Individual
.where(dossier_id: dossiers_ids)
.pluck(:dossier_id, *fields.map { |f| f[COLUMN].to_sym })
.each { |id, *columns| fields.zip(columns).each { |field, value| field[:id_value_h][id] = value } }
when 'etablissement'
Etablissement
.where(dossier_id: dossiers_ids)
.pluck(:dossier_id, *fields.map { |f| f[COLUMN].to_sym })
.each { |id, *columns| fields.zip(columns).each { |field, value| field[:id_value_h][id] = value } }
when 'user'
Dossier
fields[0][:id_value_h] = Dossier # there is only one field available for user table
.joins(:user)
.where(id: dossiers_ids)
.pluck('dossiers.id, users.email')
.to_h
when 'individual'
Individual
.where(dossier_id: dossiers_ids)
.pluck(:dossier_id, field[COLUMN].to_sym)
.to_h
when 'etablissement'
Etablissement
.where(dossier_id: dossiers_ids)
.pluck(:dossier_id, field[COLUMN].to_sym)
.to_h
when 'groupe_instructeur'
Dossier
fields[0][:id_value_h] = Dossier
.joins(:groupe_instructeur)
.where(id: dossiers_ids)
.pluck('dossiers.id, groupe_instructeurs.label')
.to_h
when 'followers_instructeurs'
Follow
fields[0][:id_value_h] = Follow
.active
.joins(instructeur: :user)
.where(dossier_id: dossiers_ids)