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Politician
Validations:

• A politician's name is a string. has to be present and has to be has to be different from null or empty
• A politician's party is a string, has to be present and has to be has to be different from null or empty
• A politician's salary is an integer, has to be present, has to be different from null and of a value greater than 0
• A politician's tag_line is a string, has to be present
• A politician's description is a text
• A politician's location is a string, has to be present, has to be different from null or empty
• A politician's photo_url is a string, has to be present, has to be different from null or empty

a politician has many votes
a politician has many meetings
a politician has many reviews
a politician has many users through votes and meetings
a politician has an average rate resulting from the average review rating

Review

• A review's user_id is an integer, has to be present, has to be different than null
• A review's politician_id is an integer, has to be present, has to be different than null
• A review's rating is an integer, has to be present, has to be a value greater or equal to 0 and smaller or equal to 10
• A review's title is a string, has to be present, has to be different from null or empty
• A review's description is a text, has to be present, has to be different from null or empty
• A review's used_services is a boolean, has to be present, default value = false

a review belongs_to a politician
a review belongs_to a user

Vote

• A vote's user_id is an integer, has to be present, has to be different than null
• A vote's politician_id is an integer, has to be present, has to be different than null
• A vote's subject is a string, has to be present, has to be different from null or empty
• A vote's used_services is a boolean, has to be present, default value = false

a vote belongs_to a politician
a vote belongs_to a user

Meeting

• A vote's user_id is an integer, has to be present, has to be different than null or empty
• A vote's politician_id is an integer, has to be present, has to be different than null
• A vote's start_date is a date, has to be present, has to be different from null or empty
• A vote's end_date is a date, has to be present, has to be different from null or empty

a vote belongs_to a politician
a vote belongs_to a user

User

• A user's name is a string, has to be present, has to be different than null
• A vote's photo_url is an integer, has to be present, has to be different than null or empty

a user has may votes
a user has many reviews
a user has many politicians through votes and reviews

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