Module: CompositePrimaryKeys::ActiveRecord::FinderMethods

Included in:
CompositeRelation
Defined in:
lib/composite_primary_keys/relation/finder_methods.rb

Instance Method Summary collapse

Instance Method Details

#apply_join_dependency(eager_loading: group_values.empty?) ⇒ Object 



4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
 
# File 'lib/composite_primary_keys/relation/finder_methods.rb', line 4

def apply_join_dependency(eager_loading: group_values.empty?)
  join_dependency = construct_join_dependency(eager_load_values + includes_values, Arel::Nodes::OuterJoin)
  relation = except(:includes, :eager_load, :preload).joins!(join_dependency)

  if eager_loading && !using_limitable_reflections?(join_dependency.reflections)
    if has_limit_or_offset?
      limited_ids = limited_ids_for(relation)

      # CPK
      # limited_ids.empty? ? relation.none! : relation.where!(primary_key => limited_ids)
      limited_ids.empty? ? relation.none! : relation.where!(cpk_in_predicate(table, self.primary_keys, limited_ids))
    end
    relation.limit_value = relation.offset_value = nil
  end

  if block_given?
    yield relation, join_dependency
  else
    relation
  end
end

#construct_relation_for_exists(conditions) ⇒ Object 



50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
 
# File 'lib/composite_primary_keys/relation/finder_methods.rb', line 50

def construct_relation_for_exists(conditions)
  conditions = sanitize_forbidden_attributes(conditions)

  if distinct_value && offset_value
    relation = except(:order).limit!(1)
  else
    relation = except(:select, :distinct, :order)._select!(::ActiveRecord::FinderMethods::ONE_AS_ONE).limit!(1)
  end

  case conditions
    # CPK
    when CompositePrimaryKeys::CompositeKeys
      relation = relation.where(cpk_id_predicate(table, primary_key, conditions))
    # CPK
    when Array
      pk_length = @klass.primary_keys.length

      if conditions.length == pk_length # E.g. conditions = ['France', 'Paris']
        return self.construct_relation_for_exists(conditions.to_composite_keys)
      else # Assume that conditions contains where relation
        relation = relation.where(conditions)
      end
    when Array, Hash
      relation.where!(conditions) unless conditions.empty?
    else
      relation.where!(primary_key => conditions) unless conditions == :none
  end

  relation
end

#find_one(id) ⇒ Object

def last(limit = nil)

return find_last(limit) if loaded? || has_limit_or_offset?

result = limit(limit || 1)
# CPK
# result.order!(table[primary_key]) if order_values.empty? && primary_key
if order_values.empty? && primary_key
  if composite?
    result.order!(primary_keys.map { |pk| table[pk].asc })
  elsif
    result.order!(table[primary_key])
  end
end

result = result.reverse_order!

limit ? result.reverse : result.first

rescue ::ActiveRecord::IrreversibleOrderError

ActiveSupport::Deprecation.warn(<<-WARNING.squish)
    Finding a last element by loading the relation when SQL ORDER
    can not be reversed is deprecated.
    Rails 5.1 will raise ActiveRecord::IrreversibleOrderError in this case.
    Please call `to_a.last` if you still want to load the relation.
WARNING
find_last(limit)

end



135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
 
# File 'lib/composite_primary_keys/relation/finder_methods.rb', line 135

def find_one(id)
  if ::ActiveRecord::Base === id
    raise ArgumentError, <<-MSG.squish
      You are passing an instance of ActiveRecord::Base to `find`.
      Please pass the id of the object by calling `.id`.
    MSG
  end

  # CPK
  #relation = where(primary_key => id)
  relation = where(cpk_id_predicate(table, primary_keys, id))
  record = relation.take

  raise_record_not_found_exception!(id, 0, 1) unless record

  record
end

#find_some(ids) ⇒ Object 



153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
 
# File 'lib/composite_primary_keys/relation/finder_methods.rb', line 153

def find_some(ids)
  # CPK
  if composite?
    ids = if ids.length == 1
            CompositePrimaryKeys::CompositeKeys.parse(ids.first)
          else
            ids.to_composite_keys
          end
  end

  return find_some_ordered(ids) unless order_values.present?

  # CPK
  # result = where(primary_key => ids).to_a
  result = if composite?
    result = where(cpk_in_predicate(table, primary_keys, ids)).to_a
  else
    result = where(primary_key => ids).to_a
  end

  expected_size =
    if limit_value && ids.size > limit_value
      limit_value
    else
      ids.size
    end

  # 11 ids with limit 3, offset 9 should give 2 results.
  if offset_value && (ids.size - offset_value < expected_size)
    expected_size = ids.size - offset_value
  end

  if result.size == expected_size
    result
  else
    raise_record_not_found_exception!(ids, result.size, expected_size)
  end
end

#find_some_ordered(ids) ⇒ Object 



192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
 
# File 'lib/composite_primary_keys/relation/finder_methods.rb', line 192

def find_some_ordered(ids)
  ids = ids.slice(offset_value || 0, limit_value || ids.size) || []

  # CPK
  # result = except(:limit, :offset).where(primary_key => ids).records
  result = if composite?
    except(:limit, :offset).where(cpk_in_predicate(table, primary_keys, ids)).records
  else
    except(:limit, :offset).where(primary_key => ids).records
  end

  if result.size == ids.size
    pk_type = @klass.type_for_attribute(primary_key)

    records_by_id = result.index_by(&:id)
    # CPK
    # ids.map { |id| records_by_id.fetch(pk_type.cast(id)) }
    if composite?
      ids.map do |id|
        typecasted_id = primary_keys.zip(id).map do |col, val|
          @klass.type_for_attribute(col).cast(val)
        end
        records_by_id.fetch(typecasted_id)
      end
    else
      ids.map { |id| records_by_id.fetch(pk_type.cast(id)) }
    end
  else
    raise_record_not_found_exception!(ids, result.size, ids.size)
  end
end

#find_with_ids(*ids) ⇒ Object

Raises:

  • (UnknownPrimaryKey) 


81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
 
# File 'lib/composite_primary_keys/relation/finder_methods.rb', line 81

def find_with_ids(*ids)
  raise UnknownPrimaryKey.new(@klass) if primary_key.nil?

  # CPK
  # expects_array = ids.first.kind_of?(Array)
  ids = CompositePrimaryKeys.normalize(ids, @klass.primary_keys.length)
  expects_array = ids.flatten != ids.flatten(1)
  return ids.first if expects_array && ids.first.empty?

  # CPK
  # ids = ids.flatten.compact.uniq
  ids = expects_array ? ids.first : ids

  model_name = @klass.name

  case ids.size
  when 0
    error_message = "Couldn't find #{model_name} without an ID"
    raise ::ActiveRecord::RecordNotFound.new(error_message, model_name, primary_key)
  when 1
    result = find_one(ids.first)
    expects_array ? [ result ] : result
  else
    find_some(ids)
  end
end

#limited_ids_for(relation) ⇒ Object 



26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
 
# File 'lib/composite_primary_keys/relation/finder_methods.rb', line 26

def limited_ids_for(relation)
  # CPK
  # values = @klass.connection.columns_for_distinct(
  #     connection.column_name_from_arel_node(table[primary_key]),
  #     relation.order_values
  # )

  columns = @klass.primary_keys.map do |key|
    connection.visitor.compile(table[key])
  end
  values = @klass.connection.columns_for_distinct(columns, relation.order_values)

  relation = relation.except(:select).select(values).distinct!

  id_rows = skip_query_cache_if_necessary { @klass.connection.select_all(relation.arel, "SQL") }
  # CPK
  #id_rows.map { |row| row[primary_key] }
  id_rows.map do |row|
    @klass.primary_keys.map do |key|
      row[key]
    end
  end
end

#ordered_relation ⇒ Object 



224
225
226
227
228
229
230
231
232
 
# File 'lib/composite_primary_keys/relation/finder_methods.rb', line 224

def ordered_relation
  if order_values.empty? && (implicit_order_column || primary_key)
    # CPK
    # order(table[implicit_order_column || primary_key].asc)
    order(Array(implicit_order_column || primary_key).map {|key| table[key].asc})
  else
    self
  end
end