Class: Exwiw::TableConfig

Inherits:
Object
  • Object
show all
Includes:
Serdes
Defined in:
lib/exwiw/table_config.rb

Constant Summary collapse

RAILS_MANAGED_SCHEMA_MIGRATIONS = 
"rails_managed_schema_migrations"
RAILS_MANAGED_INTERNAL_METADATA = 
"rails_managed_internal_metadata"
RAILS_MANAGED_TYPES = 
[
  RAILS_MANAGED_SCHEMA_MIGRATIONS,
  RAILS_MANAGED_INTERNAL_METADATA,
].freeze
UNSUPPORTED_COMPOSITE_PRIMARY_KEY =

type marking a table with a composite primary key, which exwiw does not support yet. schema:generate attaches it together with ignore:true. Unlike rails-managed tables, columns/belongs_tos are retained so it can serve as a signpost for adding support later.

"unsupported_composite_primary_key"

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.from(hash) ⇒ Object 



30
31
32
33
34
 
# File 'lib/exwiw/table_config.rb', line 30

def self.from(hash)
  config = super
  config.send(:validate_after_load!)
  config
end

.from_symbol_keys(hash) ⇒ Object 



36
37
38
 
# File 'lib/exwiw/table_config.rb', line 36

def self.from_symbol_keys(hash)
  from(JSON.parse(hash.to_json))
end

Instance Method Details

#belongs_to(table_name) ⇒ Object 



67
68
69
 
# File 'lib/exwiw/table_config.rb', line 67

def belongs_to(table_name)
  belongs_tos.find { |relation| relation.table_name == table_name }
end

#build_extract_query(extract_target_table, extract_target_ids, tables_by_name) ⇒ Object 



71
72
73
74
75
76
77
78
79
80
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
107
108
109
110
111
112
 
# File 'lib/exwiw/table_config.rb', line 71

def build_extract_query(extract_target_table, extract_target_ids, tables_by_name)
  # target is itself
  if name == extract_target_table
    return [{
      from: name,
      where: [{ primary_key => extract_target_ids }],
      join: [],
      select: column_names,
    }]
  end

  # it is not related to target table
  if belongs_to.empty?
    return [{
      from: name,
      where: [],
      join: [],
      select: column_names,
    }]
  end

  belongs_to_extract_target_table = belongs_tos.find { |relation| relation.table_name == extract_target_table }
  if belongs_to_extract_target_table
    key = belongs_to_extract_target_table.foreign_key
    return [{ from: name, where: [{ key => extract_target_ids }], join: [], select: column_names }]
  end

  ret = compute_dependency_to_table(extract_target_table, tables_by_name)

  if ret.empty?
    [{
      from: name,
      where: [],
      join: [],
      select: column_names,
    }]
  else
    last = ret.last
    last[:where] = [{ last[:foreign_key] => extract_target_ids }]
    ret
  end
end

#column_names ⇒ Object 



53
54
55
 
# File 'lib/exwiw/table_config.rb', line 53

def column_names
  columns.map(&:name)
end

#merge(passed_table) ⇒ Object 



114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
 
# File 'lib/exwiw/table_config.rb', line 114

def merge(passed_table)
  return passed_table if passed_table.to_hash == self.to_hash


  TableConfig.new.tap do |merged_table|
    merged_table.name = name
    merged_table.primary_key = passed_table.primary_key
    merged_table.type = passed_table.type
    merged_table.comment = comment
    merged_table.filter = filter
    merged_table.bulk_insert_chunk_size = passed_table.bulk_insert_chunk_size
    merged_table.ignore = ignore

    # Structural facts of each belongs_to come from the freshly generated
    # config, but the user-owned `comment`/`ignore` carry over when the same
    # relation still exists.
    receiver_belongs_to_by_identity = belongs_tos.each_with_object({}) { |bt, hash| hash[bt.identity] = bt }
    merged_table.belongs_tos =
      passed_table.belongs_tos.map do |passed_belongs_to|
        receiver_belongs_to = receiver_belongs_to_by_identity[passed_belongs_to.identity]
        if receiver_belongs_to
          passed_belongs_to.comment = receiver_belongs_to.comment if receiver_belongs_to.comment
          passed_belongs_to.ignore = receiver_belongs_to.ignore unless receiver_belongs_to.ignore.nil?
        end
        passed_belongs_to
      end

    receiver_column_by_name = columns.each_with_object({}) { |column, hash| hash[column.name] = column }

    merged_table.columns =
      passed_table.columns.map do |passed_column|
        if receiver_column_by_name.key?(passed_column.name)
          receiver_column = receiver_column_by_name[passed_column.name]
          receiver_column
        else
          passed_column
        end
      end
  end
end

#rails_managed? ⇒ Boolean

Returns:

  • (Boolean) 


40
41
42
 
# File 'lib/exwiw/table_config.rb', line 40

def rails_managed?
  RAILS_MANAGED_TYPES.include?(type)
end

#reject_ignored_members! ⇒ Object

Drop the belongs_tos/columns flagged ‘ignore:true` so they are excluded from extraction (dependency ordering, SELECT projection, INSERT). The config files on disk keep these entries; this is applied to the runtime config right after it is loaded from a file (see Runner#load_table_config).



61
62
63
64
65
 
# File 'lib/exwiw/table_config.rb', line 61

def reject_ignored_members!
  self.belongs_tos = belongs_tos.reject(&:ignore)
  self.columns = columns.reject(&:ignore)
  self
end

#to_hash ⇒ Object 



44
45
46
47
48
49
50
51
 
# File 'lib/exwiw/table_config.rb', line 44

def to_hash
  hash = super
  if rails_managed?
    hash.delete("belongs_tos")
    hash.delete("columns")
  end
  hash
end