Class: Dbwatcher::Services::MermaidSyntax::ErdBuilder

Inherits:
BaseBuilder
  • Object
show all
Defined in:
lib/dbwatcher/services/mermaid_syntax/erd_builder.rb

Overview

Builder for Entity Relationship Diagrams in Mermaid syntax

Generates Mermaid ERD syntax from a standardized dataset with support for attributes and relationships with cardinality.

Examples:

builder = ErdBuilder.new(show_attributes: true)
content = builder.build_from_dataset(dataset)
# => "erDiagram\n    USER {\n        int id PK\n    }\n    USER ||--o{ ORDER : \"has_many\""

Instance Method Summary collapse

Methods inherited from BaseBuilder

#initialize

Methods included from Logging

#debug_enabled?, #log_debug, #log_error, #log_info, #log_warn

Constructor Details

This class inherits a constructor from Dbwatcher::Services::MermaidSyntax::BaseBuilder

Instance Method Details

#build_empty(message) ⇒ String

Build empty ERD with message

Parameters:

  • message (String) —

    message to display

Returns:

  • (String) —

    Mermaid ERD content



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# File 'lib/dbwatcher/services/mermaid_syntax/erd_builder.rb', line 43

def build_empty(message)
  sanitized_message = sanitize_text(message)
  [
    "erDiagram",
    "    EMPTY_STATE {",
    "        string message \"#{sanitized_message}\"",
    "    }"
  ].join("\n")
end

#build_from_dataset(dataset) ⇒ String

Build ERD content from dataset

Parameters:

Returns:

  • (String) —

    Mermaid ERD content



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# File 'lib/dbwatcher/services/mermaid_syntax/erd_builder.rb', line 20

def build_from_dataset(dataset)
  lines = ["erDiagram"]

  # Add entity definitions with attributes
  dataset.entities.each_value do |entity|
    lines += build_erd_entity(entity)
  end

  # Add relationships
  unless dataset.relationships.empty?
    lines << ""
    dataset.relationships.each do |relationship|
      lines << build_erd_relationship(relationship, dataset)
    end
  end

  lines.join("\n")
end