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74 lines
2.9 KiB
Markdown
74 lines
2.9 KiB
Markdown
2 weeks ago
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# State and City Models
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The `State` and `City` models are designed to manage geographical data within your application. These models allow for the organization of locations, enabling functionalities related to regional management of users, services, or logistics.
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## State Model
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The `State` model represents a geographical region within a country and serves as a parent for the `City` model.
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### Fields Description
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### 1. `id`
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- **Type:** Integer
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- **Description:** A unique identifier for each state. This field is automatically generated and serves as the primary key for the model.
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### 2. `name`
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- **Type:** Text
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- **Description:** The name of the state. This field is required.
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### 3. `lat`
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- **Type:** Double
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- **Description:** The latitude coordinate of the state, which can be useful for mapping and geographical calculations.
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### 4. `lng`
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- **Type:** Double
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- **Description:** The longitude coordinate of the state, complementing the latitude for precise geographical representation.
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### 5. `country`
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- **Type:** Text
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- **Description:** The name of the country that the state belongs to. This field is essential for understanding the geographical context of the state.
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## Summary
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The `State` model provides a structured representation of states within a country, including essential geographical coordinates and country affiliation.
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---
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## City Model
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The `City` model represents urban areas within a state and establishes a relationship with the `State` model.
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### Fields Description
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### 1. `id`
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- **Type:** Integer
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- **Description:** A unique identifier for each city. This field is automatically generated and serves as the primary key for the model.
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### 2. `name`
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- **Type:** Text
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- **Description:** The name of the city. This field is required.
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### 3. `lat`
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- **Type:** Double (Nullable)
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- **Description:** The latitude coordinate of the city, which can be useful for mapping and location services.
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### 4. `lng`
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- **Type:** Double (Nullable)
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- **Description:** The longitude coordinate of the city, providing necessary details for accurate location mapping.
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### 5. `state_id`
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- **Type:** Unsigned Big Integer
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- **Description:** The ID of the state to which this city belongs. This establishes a foreign key relationship with the `State` model, linking cities to their respective states.
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## Summary
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The `City` model complements the `State` model by providing a detailed structure for managing cities within specific states. It allows for clear organization of geographical data, essential for functionalities requiring location-based services.
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---
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### Relationship Between State and City
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- Each `State` can have multiple associated `City` records, establishing a one-to-many relationship.
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- The `City` model includes a foreign key (`state_id`) that links each city to its respective state.
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By integrating the `State` and `City` models, your application can effectively manage geographical data, facilitating the organization of regional information for users and services.
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