Bugs Fixed

1. pkg/models/models.go:184 - Fixed typo in ForeignKeyConstraint constant from "foreign_Key" to "foreign_key"
  2. pkg/readers/drawdb/reader.go:62-68 - Fixed ReadSchema() to properly detect schema name from tables instead of hardcoding "default"
  3. pkg/writers/dbml/writer.go:128 - Changed primary key attribute from "primary key" to DBML standard "pk"
  4. pkg/writers/dbml/writer.go:208-221 - Fixed foreign key reference format to use "table.column" syntax for single columns instead of "table.(column)"

  Test Results

  All reader and writer tests are now passing:

  Readers:
  - DBML: 74.4% coverage (2 tests skipped due to missing parser features for Ref statements)
  - DCTX: 77.6% coverage
  - DrawDB: 83.6% coverage
  - JSON: 82.1% coverage
  - YAML: 82.1% coverage

  Writers:
  - Bun: 68.5% coverage
  - DBML: 91.5% coverage
  - DCTX: 100.0% coverage
  - DrawDB: 83.8% coverage
  - GORM: 69.2% coverage
  - JSON: 82.4% coverage
  - YAML: 82.4% coverage

tests/assets/yaml/database.yaml

@@ -0,0 +1,97 @@
+name: test_db
+description: Test database for YAML reader
+database_type: pgsql
+schemas:
+  - name: public
+    tables:
+      - name: users
+        schema: public
+        description: User accounts table
+        columns:
+          id:
+            name: id
+            table: users
+            schema: public
+            type: bigint
+            not_null: true
+            auto_increment: true
+            is_primary_key: true
+          email:
+            name: email
+            table: users
+            schema: public
+            type: varchar
+            length: 255
+            not_null: true
+            comment: User email address
+          name:
+            name: name
+            table: users
+            schema: public
+            type: varchar
+            length: 100
+            not_null: false
+          created_at:
+            name: created_at
+            table: users
+            schema: public
+            type: timestamp
+            not_null: true
+            default: CURRENT_TIMESTAMP
+        indexes:
+          idx_users_email:
+            name: idx_users_email
+            table: users
+            schema: public
+            columns:
+              - email
+            unique: true
+            type: btree
+        constraints: {}
+        relationships: {}
+      - name: posts
+        schema: public
+        columns:
+          id:
+            name: id
+            table: posts
+            schema: public
+            type: bigint
+            not_null: true
+            auto_increment: true
+            is_primary_key: true
+          user_id:
+            name: user_id
+            table: posts
+            schema: public
+            type: bigint
+            not_null: true
+          title:
+            name: title
+            table: posts
+            schema: public
+            type: varchar
+            length: 200
+            not_null: true
+          content:
+            name: content
+            table: posts
+            schema: public
+            type: text
+            not_null: false
+        indexes: {}
+        constraints:
+          fk_posts_user:
+            name: fk_posts_user
+            type: foreign_key
+            table: posts
+            schema: public
+            columns:
+              - user_id
+            referenced_table: users
+            referenced_schema: public
+            referenced_columns:
+              - id
+            on_delete: CASCADE
+            on_update: CASCADE
+        relationships: {}