Class: RailsAiContext::Introspectors::SchemaReader

Inherits:
Object
  • Object
show all
Defined in:
lib/rails_ai_context/introspectors/schema_reader.rb

Overview

AST-backed view of a schema.rb dump: which tables it declares, their columns, defaults and indexes, plus the foreign keys, enum types and check constraints declared alongside them.

The listener emits a flat, ordered event list, so columns, in-table indexes and in-table constraints are attached to the most recent create_table. Top-level add_index and add_check_constraint name their own table.

Callers keep their own output shapes: this reads the dump, it does not decide how a table is reported.

Instance Method Summary collapse

Constructor Details

#initialize(path) ⇒ SchemaReader

Returns a new instance of SchemaReader.



17
18
19
 
# File 'lib/rails_ai_context/introspectors/schema_reader.rb', line 17

def initialize(path)
  @path = path
end

Instance Method Details

#any_column?(name) ⇒ Boolean

Returns:

  • (Boolean) 


53
54
55
 
# File 'lib/rails_ai_context/introspectors/schema_reader.rb', line 53

def any_column?(name)
  tables.any? { |table, _| column?(table, name) }
end

#check_constraints ⇒ Array<Hash>

Returns { table:, expression: } per declared constraint.

Returns:

  • (Array<Hash>) —

    { table:, expression: } per declared constraint



37
38
39
 
# File 'lib/rails_ai_context/introspectors/schema_reader.rb', line 37

def check_constraints
  parse[:check_constraints]
end

#column?(table, name) ⇒ Boolean

Returns:

  • (Boolean) 


49
50
51
 
# File 'lib/rails_ai_context/introspectors/schema_reader.rb', line 49

def column?(table, name)
  columns_for(table).any? { |c| c[:name] == name }
end

#defaults_for(table) ⇒ Object

Declared defaults for one table, as source text. Callers report these verbatim when the live database returns no default.



43
44
45
46
47
 
# File 'lib/rails_ai_context/introspectors/schema_reader.rb', line 43

def defaults_for(table)
  columns_for(table).each_with_object({}) do |column, defaults|
    defaults[column[:name]] = column[:default] unless column[:default].nil?
  end
end

#enums ⇒ Array<Hash>

Returns { name:, values: } per declared enum type.

Returns:

  • (Array<Hash>) —

    { name:, values: } per declared enum type



32
33
34
 
# File 'lib/rails_ai_context/introspectors/schema_reader.rb', line 32

def enums
  parse[:enums]
end

#foreign_keys ⇒ Array<Hash>

Returns { from:, to: } per declared foreign key.

Returns:

  • (Array<Hash>) —

    { from:, to: } per declared foreign key



27
28
29
 
# File 'lib/rails_ai_context/introspectors/schema_reader.rb', line 27

def foreign_keys
  parse[:foreign_keys]
end

#tables ⇒ Hash

Returns table name => { options:, columns: [...], indexes: [...] }.

Returns:

  • (Hash) —

    table name => { options:, columns: [...], indexes: [...] }



22
23
24
 
# File 'lib/rails_ai_context/introspectors/schema_reader.rb', line 22

def tables
  parse[:tables]
end