# Clear ORM ## Clear ORM - [Welcome to Clear](https://clear.gitbook.io/project/readme.md) - [Setup](https://clear.gitbook.io/project/introduction/installation.md) - [Defining your model](https://clear.gitbook.io/project/model/column-types.md) - [Describing your columns](https://clear.gitbook.io/project/model/column-types/model-definition.md) - [Primary Keys](https://clear.gitbook.io/project/model/column-types/primary-keys.md) - [Converters](https://clear.gitbook.io/project/model/column-types/converters.md) - [Associations](https://clear.gitbook.io/project/model/associations.md): Relation describes the interaction between different models. Clear handles 4 type of relation: Belongs to, Has Many, Has Many Through and Has One. - [belongs\_to](https://clear.gitbook.io/project/model/associations/belongs_to.md) - [has\_many](https://clear.gitbook.io/project/model/associations/has_many.md) - [has\_many through](https://clear.gitbook.io/project/model/associations/has_many-through.md) - [has\_one](https://clear.gitbook.io/project/model/associations/has_one.md) - [Lifecycle](https://clear.gitbook.io/project/model/lifecycle.md) - [Persistence](https://clear.gitbook.io/project/model/lifecycle/persistence.md) - [Validations](https://clear.gitbook.io/project/model/lifecycle/validations.md) - [Triggers](https://clear.gitbook.io/project/model/lifecycle/callbacks.md) - [Batchs operations](https://clear.gitbook.io/project/model/batchs-operations.md) - [Bulk update](https://clear.gitbook.io/project/model/batchs-operations/bulk-update.md) - [Bulk insert & delete](https://clear.gitbook.io/project/model/batchs-operations/bulk-insert.md) - [Transactions & Save Points](https://clear.gitbook.io/project/model/transactions-and-save-points.md) - [Transaction & Savepoints](https://clear.gitbook.io/project/model/transactions-and-save-points/transaction.md) - [Connection pool](https://clear.gitbook.io/project/model/transactions-and-save-points/connection-pool.md) - [Locks](https://clear.gitbook.io/project/model/locks.md) - [The collection object](https://clear.gitbook.io/project/querying/the-collection-object.md) - [Filter the query](https://clear.gitbook.io/project/querying/the-collection-object/filter-the-query-1.md): Clear offers many tools to filter and refine your query - [Filter the query – The Expression Engine](https://clear.gitbook.io/project/querying/the-collection-object/filter-the-query-1/filter-the-query.md) - [Find, First, Last, Offset, Limit](https://clear.gitbook.io/project/querying/the-collection-object/filter-the-query-1/find-first.md) - [Aggregation](https://clear.gitbook.io/project/querying/the-collection-object/filter-the-query-1/aggregation.md) - [Ordering & Group by](https://clear.gitbook.io/project/querying/the-collection-object/filter-the-query-1/ordering.md) - [Fetching the query](https://clear.gitbook.io/project/querying/the-collection-object/fetching-the-query.md) - [Each and Fetch](https://clear.gitbook.io/project/querying/the-collection-object/fetching-the-query/each-map-fetch.md) - [Cursored fetching](https://clear.gitbook.io/project/querying/the-collection-object/fetching-the-query/cursored-fetching.md) - [Model extra attributes](https://clear.gitbook.io/project/querying/the-collection-object/fetching-the-query/model-attributes.md) - [Joins](https://clear.gitbook.io/project/querying/the-collection-object/joins.md) - [Eager Loading](https://clear.gitbook.io/project/querying/the-collection-object/n+1-query-avoidance.md) - [Window and CTE](https://clear.gitbook.io/project/querying/the-collection-object/window-and-cte.md) - [Scopes](https://clear.gitbook.io/project/querying/the-collection-object/scopes.md) - [Writing low-level SQL](https://clear.gitbook.io/project/querying/low-level-sql.md) - [Select Clause](https://clear.gitbook.io/project/querying/low-level-sql/select-clause.md) - [Insert Clause](https://clear.gitbook.io/project/querying/low-level-sql/insert-clause.md) - [Delete Clause](https://clear.gitbook.io/project/querying/low-level-sql/delete-clause.md) - [Manage migrations](https://clear.gitbook.io/project/migrations/manage-migrations.md) - [Call migration script](https://clear.gitbook.io/project/migrations/call-migration-script.md) - [Migration CLI](https://clear.gitbook.io/project/migrations/migration-cli.md) - [JSONB](https://clear.gitbook.io/project/additional-and-advanced-features/jsonb.md) - [Symbol vs String](https://clear.gitbook.io/project/additional-and-advanced-features/symbol-vs-string.md) - [Enums](https://clear.gitbook.io/project/additional-and-advanced-features/enums.md) - [BCrypt](https://clear.gitbook.io/project/additional-and-advanced-features/bcrypt.md) - [Full Text Search](https://clear.gitbook.io/project/additional-and-advanced-features/full-text-search.md) - [Handling multi-connection](https://clear.gitbook.io/project/additional-and-advanced-features/handling-multi-connection.md) - [Benchmark](https://clear.gitbook.io/project/other-resources/benchmark.md) --- # Agent Instructions This documentation is published with GitBook. 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